File name:

vstdlib_s64.dll

Full analysis: https://app.any.run/tasks/c2c0f34c-1d71-4c35-81fd-662beac83733
Verdict: Malicious activity
Threats:

FormBook is a data stealer that is being distributed as a MaaS. FormBook differs from a lot of competing malware by its extreme ease of use that allows even the unexperienced threat actors to use FormBook virus.

Malware Trends Tracker     >>>
Analysis date: March 27, 2025, 01:52:46
OS: Windows 10 Professional (build: 19045, 64 bit)
Tags:
formbook
stealer
xloader
Indicators:
MIME: application/vnd.microsoft.portable-executable
File info: PE32+ executable (DLL) (GUI) x86-64, for MS Windows, 8 sections
MD5:

897E2193493CFD989D82F6A559BF1B2A

SHA1:

DF837BC19BF863CE466588CA3121FED884922B90

SHA256:

92958C2E2D940DE78A7F5352B00890F291D568816A8FE1B2BF8C572941644EC0

SSDEEP:

98304:n2ojd8NDquPMjjoxKVCn7IalrmipqUhcLOve6A2fdK3DUrnvvaHNArNA/grPlUsw:upao

ANY.RUN is an interactive service which provides full access to the guest system. Information in this report could be distorted by user actions and is provided for user acknowledgement as it is. ANY.RUN does not guarantee maliciousness or safety of the content.

  • MALICIOUS

    • FORMBOOK has been detected

      • help.exe (PID: 5416)

    • FORMBOOK has been detected (YARA)

      • help.exe (PID: 5416)

  • SUSPICIOUS

    • Starts CMD.EXE for commands execution

      • help.exe (PID: 5416)

  • INFO

    • Checks supported languages

      • aspnet_wp.exe (PID: 4040)

    • Manual execution by a user

      • help.exe (PID: 5416)

    • Creates files or folders in the user directory

      • BackgroundTransferHost.exe (PID: 1052)

    • Reads the computer name

      • aspnet_wp.exe (PID: 4040)

    • Reads security settings of Internet Explorer

      • BackgroundTransferHost.exe (PID: 1228)
      • BackgroundTransferHost.exe (PID: 1300)
      • BackgroundTransferHost.exe (PID: 1660)
      • BackgroundTransferHost.exe (PID: 5360)
      • BackgroundTransferHost.exe (PID: 1052)

    • Checks proxy server information

      • BackgroundTransferHost.exe (PID: 1052)

    • Reads the software policy settings

      • BackgroundTransferHost.exe (PID: 1052)
Find more information about signature artifacts and mapping to MITRE ATT&CK™ MATRIX at the full report
No Malware configuration.

TRiD

.exe | Win64 Executable (generic) (87.3)
.exe | Generic Win/DOS Executable (6.3)
.exe | DOS Executable Generic (6.3)

EXIF

EXE

MachineType: AMD AMD64
TimeStamp: 2025:03:03 07:49:47+00:00
ImageFileCharacteristics: Executable, Large address aware, DLL
PEType: PE32+
LinkerVersion: 14.39
CodeSize: 4650496
InitializedDataSize: 5920256
UninitializedDataSize: -
EntryPoint: 0xbd650
OSVersion: 6
ImageVersion: -
SubsystemVersion: 6
Subsystem: Windows GUI
FileVersionNumber: 1.0.0.0
ProductVersionNumber: 1.0.0.0
FileFlagsMask: 0x003f
FileFlags: (none)
FileOS: Win32
ObjectFileType: Dynamic link library
FileSubtype: -
LanguageCode: Neutral
CharacterSet: Unicode
CompanyName: Auce
FileDescription: Auce
FileVersion: 1.0.0.0
InternalName: Auce.dll
LegalCopyright:
OriginalFileName: Auce.dll
ProductName: Auce
ProductVersion: 1.0.0
AssemblyVersion: 1.0.0.0
No data.
screenshot
All screenshots are available in the full report
All screenshots are available in the full report
Total processes
143
Monitored processes
11
Malicious processes
1
Suspicious processes
0

Behavior graph

Click at the process to see the details
start rundll32.exe no specs aspnet_wp.exe no specs #FORMBOOK help.exe no specs cmd.exe no specs conhost.exe no specs backgroundtransferhost.exe no specs backgroundtransferhost.exe backgroundtransferhost.exe no specs backgroundtransferhost.exe no specs backgroundtransferhost.exe no specs slui.exe no specs

Process information

PID
CMD
Path
Indicators
Parent process
744"C:\WINDOWS\System32\rundll32.exe" C:\Users\admin\AppData\Local\Temp\vstdlib_s64.dll, #1C:\Windows\System32\rundll32.exe—explorer.exe
User:
admin
Company:
Microsoft Corporation
Integrity Level:
MEDIUM
Description:
Windows host process (Rundll32)
Exit code:
4294967295
Version:
10.0.19041.1 (WinBuild.160101.0800)
Modules
Images
c:\windows\system32\rundll32.exe
c:\windows\system32\ntdll.dll
c:\windows\system32\kernel32.dll
c:\windows\system32\kernelbase.dll
c:\windows\system32\msvcrt.dll
c:\windows\system32\combase.dll
c:\windows\system32\ucrtbase.dll
c:\windows\system32\rpcrt4.dll
c:\windows\system32\shcore.dll
c:\windows\system32\imagehlp.dll
1052"BackgroundTransferHost.exe" -ServerName:BackgroundTransferHost.1C:\Windows\System32\BackgroundTransferHost.exe
svchost.exe
User:
admin
Company:
Microsoft Corporation
Integrity Level:
MEDIUM
Description:
Download/Upload Host
Exit code:
1
Version:
10.0.19041.3636 (WinBuild.160101.0800)
Modules
Images
c:\windows\system32\backgroundtransferhost.exe
c:\windows\system32\ntdll.dll
c:\windows\system32\kernel32.dll
c:\windows\system32\kernelbase.dll
c:\windows\system32\msvcrt.dll
c:\windows\system32\combase.dll
c:\windows\system32\ucrtbase.dll
c:\windows\system32\rpcrt4.dll
c:\windows\system32\kernel.appcore.dll
c:\windows\system32\bcryptprimitives.dll
1228"BackgroundTransferHost.exe" -ServerName:BackgroundTransferHost.1C:\Windows\System32\BackgroundTransferHost.exe—svchost.exe
User:
admin
Company:
Microsoft Corporation
Integrity Level:
MEDIUM
Description:
Download/Upload Host
Exit code:
1
Version:
10.0.19041.3636 (WinBuild.160101.0800)
Modules
Images
c:\windows\system32\backgroundtransferhost.exe
c:\windows\system32\ntdll.dll
c:\windows\system32\kernel32.dll
c:\windows\system32\kernelbase.dll
c:\windows\system32\msvcrt.dll
c:\windows\system32\combase.dll
c:\windows\system32\ucrtbase.dll
c:\windows\system32\rpcrt4.dll
c:\windows\system32\kernel.appcore.dll
c:\windows\system32\bcryptprimitives.dll
1276C:\WINDOWS\System32\slui.exe -EmbeddingC:\Windows\System32\slui.exe—svchost.exe
User:
admin
Company:
Microsoft Corporation
Integrity Level:
MEDIUM
Description:
Windows Activation Client
Version:
10.0.19041.1 (WinBuild.160101.0800)
Modules
Images
c:\windows\system32\slui.exe
c:\windows\system32\ntdll.dll
c:\windows\system32\kernel32.dll
c:\windows\system32\kernelbase.dll
c:\windows\system32\advapi32.dll
c:\windows\system32\msvcrt.dll
c:\windows\system32\sechost.dll
c:\windows\system32\rpcrt4.dll
c:\windows\system32\bcrypt.dll
c:\windows\system32\user32.dll
1300"BackgroundTransferHost.exe" -ServerName:BackgroundTransferHost.1C:\Windows\System32\BackgroundTransferHost.exe—svchost.exe
User:
admin
Company:
Microsoft Corporation
Integrity Level:
MEDIUM
Description:
Download/Upload Host
Exit code:
1
Version:
10.0.19041.3636 (WinBuild.160101.0800)
Modules
Images
c:\windows\system32\backgroundtransferhost.exe
c:\windows\system32\ntdll.dll
c:\windows\system32\kernel32.dll
c:\windows\system32\kernelbase.dll
c:\windows\system32\msvcrt.dll
c:\windows\system32\combase.dll
c:\windows\system32\ucrtbase.dll
c:\windows\system32\rpcrt4.dll
c:\windows\system32\kernel.appcore.dll
c:\windows\system32\bcryptprimitives.dll
1660"BackgroundTransferHost.exe" -ServerName:BackgroundTransferHost.1C:\Windows\System32\BackgroundTransferHost.exe—svchost.exe
User:
admin
Company:
Microsoft Corporation
Integrity Level:
MEDIUM
Description:
Download/Upload Host
Exit code:
1
Version:
10.0.19041.3636 (WinBuild.160101.0800)
Modules
Images
c:\windows\system32\backgroundtransferhost.exe
c:\windows\system32\ntdll.dll
c:\windows\system32\kernel32.dll
c:\windows\system32\kernelbase.dll
c:\windows\system32\msvcrt.dll
c:\windows\system32\combase.dll
c:\windows\system32\ucrtbase.dll
c:\windows\system32\rpcrt4.dll
c:\windows\system32\kernel.appcore.dll
c:\windows\system32\bcryptprimitives.dll
4040"C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe"C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe—rundll32.exe
User:
admin
Company:
Microsoft Corporation
Integrity Level:
MEDIUM
Description:
aspnet_wp.exe
Exit code:
0
Version:
4.8.9220.0 built by: NET481REL1LAST_C
Modules
Images
c:\windows\microsoft.net\framework\v4.0.30319\aspnet_wp.exe
c:\windows\system32\ntdll.dll
c:\windows\syswow64\ntdll.dll
c:\windows\system32\wow64.dll
c:\windows\system32\wow64win.dll
c:\windows\system32\wow64cpu.dll
c:\windows\syswow64\kernel32.dll
c:\windows\syswow64\kernelbase.dll
c:\windows\syswow64\advapi32.dll
c:\windows\syswow64\msvcrt.dll
5360"BackgroundTransferHost.exe" -ServerName:BackgroundTransferHost.1C:\Windows\System32\BackgroundTransferHost.exe—svchost.exe
User:
admin
Company:
Microsoft Corporation
Integrity Level:
MEDIUM
Description:
Download/Upload Host
Exit code:
1
Version:
10.0.19041.3636 (WinBuild.160101.0800)
Modules
Images
c:\windows\system32\backgroundtransferhost.exe
c:\windows\system32\ntdll.dll
c:\windows\system32\kernel32.dll
c:\windows\system32\kernelbase.dll
c:\windows\system32\msvcrt.dll
c:\windows\system32\combase.dll
c:\windows\system32\ucrtbase.dll
c:\windows\system32\rpcrt4.dll
c:\windows\system32\kernel.appcore.dll
c:\windows\system32\bcryptprimitives.dll
5416"C:\Windows\SysWOW64\help.exe"C:\Windows\SysWOW64\help.exe
explorer.exe
User:
admin
Company:
Microsoft Corporation
Integrity Level:
MEDIUM
Description:
Command Line Help Utility
Version:
10.0.19041.1 (WinBuild.160101.0800)
Modules
Images
c:\windows\syswow64\help.exe
c:\windows\system32\ntdll.dll
c:\windows\syswow64\ntdll.dll
c:\windows\system32\wow64.dll
c:\windows\system32\wow64win.dll
c:\windows\system32\wow64cpu.dll
c:\windows\syswow64\kernel32.dll
c:\windows\syswow64\kernelbase.dll
c:\windows\syswow64\msvcrt.dll
c:\windows\syswow64\advapi32.dll
5720\??\C:\WINDOWS\system32\conhost.exe 0xffffffff -ForceV1C:\Windows\System32\conhost.exe—cmd.exe
User:
admin
Company:
Microsoft Corporation
Integrity Level:
MEDIUM
Description:
Console Window Host
Exit code:
0
Version:
10.0.19041.1 (WinBuild.160101.0800)
Modules
Images
c:\windows\system32\conhost.exe
c:\windows\system32\ntdll.dll
c:\windows\system32\kernel32.dll
c:\windows\system32\kernelbase.dll
c:\windows\system32\msvcp_win.dll
c:\windows\system32\ucrtbase.dll
c:\windows\system32\shcore.dll
c:\windows\system32\msvcrt.dll
c:\windows\system32\combase.dll
c:\windows\system32\rpcrt4.dll
Total events
1 715
Read events
1 700
Write events
15
Delete events
0

Modification events

(PID) Process:(1660) BackgroundTransferHost.exeKey:HKEY_CLASSES_ROOT\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\microsoft.windows.contentdeliverymanager_cw5n1h2txyewy\Internet Settings\Cache\Content
Operation:writeName:CachePrefix
Value:
(PID) Process:(1660) BackgroundTransferHost.exeKey:HKEY_CLASSES_ROOT\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\microsoft.windows.contentdeliverymanager_cw5n1h2txyewy\Internet Settings\Cache\Cookies
Operation:writeName:CachePrefix
Value:
Cookie:
(PID) Process:(1660) BackgroundTransferHost.exeKey:HKEY_CLASSES_ROOT\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\microsoft.windows.contentdeliverymanager_cw5n1h2txyewy\Internet Settings\Cache\History
Operation:writeName:CachePrefix
Value:
Visited:
(PID) Process:(1052) BackgroundTransferHost.exeKey:HKEY_CLASSES_ROOT\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\microsoft.windows.contentdeliverymanager_cw5n1h2txyewy\Internet Settings\Cache\Content
Operation:writeName:CachePrefix
Value:
(PID) Process:(1052) BackgroundTransferHost.exeKey:HKEY_CLASSES_ROOT\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\microsoft.windows.contentdeliverymanager_cw5n1h2txyewy\Internet Settings\Cache\Cookies
Operation:writeName:CachePrefix
Value:
Cookie:
(PID) Process:(1052) BackgroundTransferHost.exeKey:HKEY_CLASSES_ROOT\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\microsoft.windows.contentdeliverymanager_cw5n1h2txyewy\Internet Settings\Cache\History
Operation:writeName:CachePrefix
Value:
Visited:
(PID) Process:(5360) BackgroundTransferHost.exeKey:HKEY_CLASSES_ROOT\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\microsoft.windows.contentdeliverymanager_cw5n1h2txyewy\Internet Settings\Cache\Content
Operation:writeName:CachePrefix
Value:
(PID) Process:(5360) BackgroundTransferHost.exeKey:HKEY_CLASSES_ROOT\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\microsoft.windows.contentdeliverymanager_cw5n1h2txyewy\Internet Settings\Cache\Cookies
Operation:writeName:CachePrefix
Value:
Cookie:
(PID) Process:(5360) BackgroundTransferHost.exeKey:HKEY_CLASSES_ROOT\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\microsoft.windows.contentdeliverymanager_cw5n1h2txyewy\Internet Settings\Cache\History
Operation:writeName:CachePrefix
Value:
Visited:
(PID) Process:(1228) BackgroundTransferHost.exeKey:HKEY_CLASSES_ROOT\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\microsoft.windows.contentdeliverymanager_cw5n1h2txyewy\Internet Settings\Cache\Content
Operation:writeName:CachePrefix
Value:
Executable files
0
Suspicious files
5
Text files
0
Unknown types
0

Dropped files

PID
Process
Filename
Type
1052BackgroundTransferHost.exeC:\Users\admin\AppData\Local\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\AC\BackgroundTransferApi\1346afa1-6289-4f48-bb38-2e14eca86a74.down_data —
MD5:—
SHA256:—
1052BackgroundTransferHost.exeC:\Users\admin\AppData\Local\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\AC\BackgroundTransferApi\6e7eed73-21a1-4042-98bf-67c040e27a24.9bb6caa2-60e2-42e2-b3c1-01bb70a9e91c.down_metabinary
MD5:B204993FBA47889A9E9585AEE2F0DF9F
SHA256:65EFAD5E385A9297A660D6FD677836B96AEC4501870FCF0203364A19D5303AC8
1052BackgroundTransferHost.exeC:\Users\admin\AppData\Local\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\AC\Microsoft\CryptnetUrlCache\Content\26C212D9399727259664BDFCA073966E_F9F7D6A7ECE73106D2A8C63168CDA10Dbinary
MD5:FA6095A37891A45F775E9A21DDAA863A
SHA256:9D7DF71A8C9E60562B699363C26409853C04962CEA5482CD56835B600A7CFA7C
1052BackgroundTransferHost.exeC:\Users\admin\AppData\Local\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\AC\BackgroundTransferApi\6e7eed73-21a1-4042-98bf-67c040e27a24.up_meta_securebinary
MD5:01F3F09230547FDC3E7E6094227FB33D
SHA256:36649D05C5169F1ABDDCD43A952F1DF2AE295041987C17ACDC1C98ED16B7D4C1
1052BackgroundTransferHost.exeC:\Users\admin\AppData\Local\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\AC\BackgroundTransferApi\1346afa1-6289-4f48-bb38-2e14eca86a74.9bb6caa2-60e2-42e2-b3c1-01bb70a9e91c.down_metabinary
MD5:B204993FBA47889A9E9585AEE2F0DF9F
SHA256:65EFAD5E385A9297A660D6FD677836B96AEC4501870FCF0203364A19D5303AC8
1052BackgroundTransferHost.exeC:\Users\admin\AppData\Local\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\AC\Microsoft\CryptnetUrlCache\MetaData\26C212D9399727259664BDFCA073966E_F9F7D6A7ECE73106D2A8C63168CDA10Dbinary
MD5:A2C036AF70E1C11342EBF47535C44BAF
SHA256:32802BFAE3583D869D8F63BDCC4669D1A10724EB819ABE51B698142C5213CAA1
Download PCAP, analyze network streams, HTTP content and a lot more at the full report
HTTP(S) requests
6
TCP/UDP connections
25
DNS requests
16
Threats
0

HTTP requests

PID
Process
Method
HTTP Code
IP
URL
CN
Type
Size
Reputation
—
—
GET
200
2.16.164.120:80
http://crl.microsoft.com/pki/crl/products/MicRooCerAut2011_2011_03_22.crl
unknown
—
—
whitelisted
6544
svchost.exe
GET
200
2.23.77.188:80
http://ocsp.digicert.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBSAUQYBMq2awn1Rh6Doh%2FsBYgFV7gQUA95QNVbRTLtm8KPiGxvDl7I90VUCEAJ0LqoXyo4hxxe7H%2Fz9DKA%3D
unknown
—
—
whitelisted
2692
backgroundTaskHost.exe
GET
200
184.30.131.245:80
http://ocsp.digicert.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBQ50otx%2Fh0Ztl%2Bz8SiPI7wEWVxDlQQUTiJUIBiV5uNu5g%2F6%2BrkS7QYXjzkCEAUZZSZEml49Gjh0j13P68w%3D
unknown
—
—
whitelisted
5344
SIHClient.exe
GET
200
23.35.229.160:80
http://www.microsoft.com/pkiops/crl/Microsoft%20ECC%20Update%20Secure%20Server%20CA%202.1.crl
unknown
—
—
whitelisted
5344
SIHClient.exe
GET
200
23.35.229.160:80
http://www.microsoft.com/pkiops/crl/Microsoft%20ECC%20Product%20Root%20Certificate%20Authority%202018.crl
unknown
—
—
whitelisted
1052
BackgroundTransferHost.exe
GET
200
184.30.131.245:80
http://ocsp.digicert.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBTrjrydRyt%2BApF3GSPypfHBxR5XtQQUs9tIpPmhxdiuNkHMEWNpYim8S8YCEAI5PUjXAkJafLQcAAsO18o%3D
unknown
—
—
whitelisted
Download PCAP, analyze network streams, HTTP content and a lot more at the full report

Connections

PID
Process
IP
Domain
ASN
CN
Reputation
4
System
192.168.100.255:137
—
—
—
whitelisted
—
—
51.124.78.146:443
settings-win.data.microsoft.com
MICROSOFT-CORP-MSN-AS-BLOCK
NL
whitelisted
—
—
2.16.164.120:80
crl.microsoft.com
Akamai International B.V.
NL
whitelisted
4
System
192.168.100.255:138
—
—
—
whitelisted
3216
svchost.exe
172.172.255.218:443
client.wns.windows.com
MICROSOFT-CORP-MSN-AS-BLOCK
US
whitelisted
6544
svchost.exe
40.126.32.133:443
login.live.com
MICROSOFT-CORP-MSN-AS-BLOCK
NL
whitelisted
6544
svchost.exe
2.23.77.188:80
ocsp.digicert.com
AKAMAI-AS
DE
whitelisted
2104
svchost.exe
40.127.240.158:443
settings-win.data.microsoft.com
MICROSOFT-CORP-MSN-AS-BLOCK
IE
whitelisted
2692
backgroundTaskHost.exe
20.74.47.205:443
arc.msn.com
MICROSOFT-CORP-MSN-AS-BLOCK
FR
whitelisted
2692
backgroundTaskHost.exe
184.30.131.245:80
ocsp.digicert.com
AKAMAI-AS
US
whitelisted

DNS requests

Domain
IP
Reputation
settings-win.data.microsoft.com
  • 51.124.78.146
  • 40.127.240.158
whitelisted
google.com
  • 142.250.186.46
whitelisted
crl.microsoft.com
  • 2.16.164.120
  • 2.16.164.49
whitelisted
client.wns.windows.com
  • 172.172.255.218
whitelisted
login.live.com
  • 40.126.32.133
  • 20.190.160.4
  • 40.126.32.74
  • 20.190.160.5
  • 40.126.32.76
  • 20.190.160.64
  • 20.190.160.65
  • 20.190.160.17
whitelisted
ocsp.digicert.com
  • 2.23.77.188
  • 184.30.131.245
whitelisted
arc.msn.com
  • 20.74.47.205
whitelisted
www.bing.com
  • 92.123.104.34
  • 92.123.104.32
whitelisted
slscr.update.microsoft.com
  • 172.202.163.200
whitelisted
www.microsoft.com
  • 23.35.229.160
whitelisted

Threats

No threats detected
No debug info
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Reports
vstdlib_s64.dll