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File name:

AsyncClient.exe

Full analysis: https://app.any.run/tasks/dda4bb62-a1ae-43ba-b1c2-c6a033894856
Verdict: Malicious activity
Threats:

AsyncRAT is a RAT that can monitor and remotely control infected systems. This malware was introduced on Github as a legitimate open-source remote administration software, but hackers use it for its many powerful malicious functions.

Analysis date: November 29, 2020, 21:36:30
OS: Windows 7 Professional Service Pack 1 (build: 7601, 32 bit)
Tags:
trojan
rat
asyncrat
Indicators:
MIME: application/x-dosexec
File info: PE32 executable (GUI) Intel 80386 Mono/.Net assembly, for MS Windows
MD5:

B627A7E635F853C374A90AC29BB881B7

SHA1:

B801AF58191879DAC39CAC27A7C51B4E9D4E8007

SHA256:

D4090FB2AA5A1671DB4A28F2DC95B2789E1F7B3FCB9B4B3312AF36639F01B6C1

SSDEEP:

768:EuEUVTnk6gWXWUr+C1mo2qDbKjGKG6PIyzjbFgX3iKPrPVh3qBDZTx:EuEUVTn8Y2qKYDy3bCXSKDVOdTx

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

    • ASYNCRAT was detected

      • blake.exe (PID: 1144)
    • Changes the autorun value in the registry

      • AsyncClient.exe (PID: 2868)
  • SUSPICIOUS

    • Starts CMD.EXE for commands execution

      • AsyncClient.exe (PID: 2868)
    • Executable content was dropped or overwritten

      • AsyncClient.exe (PID: 2868)
  • INFO

    No info indicators.
Find more information about signature artifacts and mapping to MITRE ATT&CK™ MATRIX at the full report
No Malware configuration.

TRiD

.exe | Generic CIL Executable (.NET, Mono, etc.) (56.7)
.exe | Win64 Executable (generic) (21.3)
.scr | Windows screen saver (10.1)
.dll | Win32 Dynamic Link Library (generic) (5)
.exe | Win32 Executable (generic) (3.4)

EXIF

EXE

AssemblyVersion: 1.0.0.0
ProductVersion: 1.0.0.0
ProductName: -
OriginalFileName: Stub.exe
LegalTrademarks: -
LegalCopyright: -
InternalName: Stub.exe
FileVersion: 1.0.0.0
FileDescription: -
CompanyName: -
Comments: -
CharacterSet: Unicode
LanguageCode: Neutral
FileSubtype: -
ObjectFileType: Executable application
FileOS: Win32
FileFlags: (none)
FileFlagsMask: 0x003f
ProductVersionNumber: 1.0.0.0
FileVersionNumber: 1.0.0.0
Subsystem: Windows GUI
SubsystemVersion: 4
ImageVersion: -
OSVersion: 4
EntryPoint: 0xc74e
UninitializedDataSize: -
InitializedDataSize: 2560
CodeSize: 43008
LinkerVersion: 8
PEType: PE32
TimeStamp: 2020:05:10 07:24:51+02:00
MachineType: Intel 386 or later, and compatibles

Summary

Architecture: IMAGE_FILE_MACHINE_I386
Subsystem: IMAGE_SUBSYSTEM_WINDOWS_GUI
Compilation Date: 10-May-2020 05:24:51
Comments: -
CompanyName: -
FileDescription: -
FileVersion: 1.0.0.0
InternalName: Stub.exe
LegalCopyright: -
LegalTrademarks: -
OriginalFilename: Stub.exe
ProductName: -
ProductVersion: 1.0.0.0
Assembly Version: 1.0.0.0

DOS Header

Magic number: MZ
Bytes on last page of file: 0x0090
Pages in file: 0x0003
Relocations: 0x0000
Size of header: 0x0004
Min extra paragraphs: 0x0000
Max extra paragraphs: 0xFFFF
Initial SS value: 0x0000
Initial SP value: 0x00B8
Checksum: 0x0000
Initial IP value: 0x0000
Initial CS value: 0x0000
Overlay number: 0x0000
OEM identifier: 0x0000
OEM information: 0x0000
Address of NE header: 0x00000080

PE Headers

Signature: PE
Machine: IMAGE_FILE_MACHINE_I386
Number of sections: 3
Time date stamp: 10-May-2020 05:24:51
Pointer to Symbol Table: 0x00000000
Number of symbols: 0
Size of Optional Header: 0x00E0
Characteristics:
  • IMAGE_FILE_32BIT_MACHINE
  • IMAGE_FILE_EXECUTABLE_IMAGE

Sections

Name
Virtual Address
Virtual Size
Raw Size
Charateristics
Entropy
.text
0x00002000
0x0000A754
0x0000A800
IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ
5.5092
.rsrc
0x0000E000
0x000007FF
0x00000800
IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ
4.88507
.reloc
0x00010000
0x0000000C
0x00000200
IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_DISCARDABLE, IMAGE_SCN_MEM_READ
0.0815394

Resources

Title
Entropy
Size
Codepage
Language
Type
1
5.22615
1171
UNKNOWN
UNKNOWN
RT_MANIFEST

Imports

mscoree.dll
No data.
screenshot
All screenshots are available in the full report
All screenshots are available in the full report
Total processes
39
Monitored processes
4
Malicious processes
3
Suspicious processes
0

Behavior graph

Click at the process to see the details
start asyncclient.exe cmd.exe no specs timeout.exe no specs #ASYNCRAT blake.exe

Process information

PID
CMD
Path
Indicators
Parent process
2868"C:\Users\admin\AppData\Local\Temp\AsyncClient.exe" C:\Users\admin\AppData\Local\Temp\AsyncClient.exe
explorer.exe
User:
admin
Integrity Level:
MEDIUM
Exit code:
0
Version:
1.0.0.0
2808cmd /c ""C:\Users\admin\AppData\Local\Temp\tmpE1C0.tmp.bat""C:\Windows\system32\cmd.exeAsyncClient.exe
User:
admin
Company:
Microsoft Corporation
Integrity Level:
MEDIUM
Description:
Windows Command Processor
Exit code:
1
Version:
6.1.7601.17514 (win7sp1_rtm.101119-1850)
3416timeout 3 C:\Windows\system32\timeout.execmd.exe
User:
admin
Company:
Microsoft Corporation
Integrity Level:
MEDIUM
Description:
timeout - pauses command processing
Exit code:
0
Version:
6.1.7600.16385 (win7_rtm.090713-1255)
1144"C:\Users\admin\AppData\Local\Temp\blake.exe" C:\Users\admin\AppData\Local\Temp\blake.exe
cmd.exe
User:
admin
Integrity Level:
MEDIUM
Version:
1.0.0.0
Total events
56
Read events
35
Write events
21
Delete events
0

Modification events

(PID) Process:(2868) AsyncClient.exeKey:HKEY_CLASSES_ROOT\Local Settings\MuiCache\13B\52C64B7E
Operation:writeName:LanguageList
Value:
en-US
(PID) Process:(2868) AsyncClient.exeKey:HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
Operation:writeName:blake
Value:
"C:\Users\admin\AppData\Local\Temp\blake.exe"
(PID) Process:(1144) blake.exeKey:HKEY_CLASSES_ROOT\Local Settings\MuiCache\13B\52C64B7E
Operation:writeName:LanguageList
Value:
en-US
Executable files
1
Suspicious files
4
Text files
1
Unknown types
0

Dropped files

PID
Process
Filename
Type
1144blake.exeC:\Users\admin\AppData\Local\Temp\Cab209.tmp
MD5:
SHA256:
1144blake.exeC:\Users\admin\AppData\Local\Temp\Tar20A.tmp
MD5:
SHA256:
1144blake.exeC:\Users\admin\AppData\Local\Temp\Cab21B.tmp
MD5:
SHA256:
1144blake.exeC:\Users\admin\AppData\Local\Temp\Tar21C.tmp
MD5:
SHA256:
1144blake.exeC:\Users\admin\AppData\Local\Temp\Cab2E8.tmp
MD5:
SHA256:
1144blake.exeC:\Users\admin\AppData\Local\Temp\Tar2E9.tmp
MD5:
SHA256:
1144blake.exeC:\Users\admin\AppData\Local\Temp\Cab3B5.tmp
MD5:
SHA256:
1144blake.exeC:\Users\admin\AppData\Local\Temp\Tar3B6.tmp
MD5:
SHA256:
1144blake.exeC:\Users\admin\AppData\Local\Temp\Cab434.tmp
MD5:
SHA256:
1144blake.exeC:\Users\admin\AppData\Local\Temp\Tar435.tmp
MD5:
SHA256:
Download PCAP, analyze network streams, HTTP content and a lot more at the full report
HTTP(S) requests
2
TCP/UDP connections
3
DNS requests
4
Threats
0

HTTP requests

PID
Process
Method
HTTP Code
IP
URL
CN
Type
Size
Reputation
1144
blake.exe
GET
200
205.185.216.42:80
http://www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootstl.cab
US
compressed
57.5 Kb
whitelisted
1144
blake.exe
GET
304
205.185.216.42:80
http://www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootstl.cab
US
compressed
57.5 Kb
whitelisted
Download PCAP, analyze network streams, HTTP content and a lot more at the full report

Connections

PID
Process
IP
Domain
ASN
CN
Reputation
1144
blake.exe
205.185.216.42:80
www.download.windowsupdate.com
Highwinds Network Group, Inc.
US
whitelisted
1144
blake.exe
24.240.72.240:5353
chair123.ddns.net
Charter Communications
US
malicious

DNS requests

Domain
IP
Reputation
chair123.ddns.net
  • 24.240.72.240
malicious
www.download.windowsupdate.com
  • 205.185.216.42
  • 205.185.216.10
whitelisted
dns.msftncsi.com
  • 131.107.255.255
shared

Threats

PID
Process
Class
Message
Potentially Bad Traffic
ET POLICY DNS Query to DynDNS Domain *.ddns .net
1144
blake.exe
A Network Trojan was detected
MALWARE [PTsecurity] AsyncRAT
1144
blake.exe
A Network Trojan was detected
ET TROJAN Observed Malicious SSL Cert (AsyncRAT Server)
1144
blake.exe
A Network Trojan was detected
MALWARE [PTsecurity] AsyncRAT
1144
blake.exe
A Network Trojan was detected
SUSPICIOUS [PTsecurity] Possible AsyncRAT SSL certificate
No debug info