File name:

YellowSkull 2.0.zip

Full analysis: https://app.any.run/tasks/b440577f-5281-432c-9082-600e0b424b90
Verdict: Malicious activity
Analysis date: December 13, 2024, 23:28:37
OS: Windows 10 Professional (build: 19045, 64 bit)
Tags:
arch-exec
arch-doc
Indicators:
MIME: application/zip
File info: Zip archive data, at least v2.0 to extract, compression method=deflate
MD5:

D700D6CCBBEA18C0FE32775A65F13280

SHA1:

7C159DD708EFD29B1404F1B7FB8D4E3D4C0D1CFD

SHA256:

0FDCD8EF8BE7B2BC8B2AA44CA2DFE251E8850B0BE1E0EC563BD3736D2F05A09D

SSDEEP:

98304:sX1++uBsOBDE0JPblL8CQhiXikAazRXOfZv4gXrQzy1SvaV1Vvc759u:81+5dDtJDlLVXztRG5Xro1Cn0e

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

    • Generic archive extractor

      • WinRAR.exe (PID: 6200)

    • Disables the LogOff the Start menu

      • reg.exe (PID: 5992)

    • UAC/LUA settings modification

      • reg.exe (PID: 6976)

    • Changes the autorun value in the registry

      • reg.exe (PID: 4300)

  • SUSPICIOUS

    • Starts CMD.EXE for commands execution

      • YellowSkull 2.0.exe (PID: 7076)

    • Executable content was dropped or overwritten

      • YellowSkull 2.0.exe (PID: 7076)
      • cmd.exe (PID: 6400)

    • Reads security settings of Internet Explorer

      • WinRAR.exe (PID: 6200)
      • YellowSkull 2.0.exe (PID: 7076)

    • Changes the desktop background image

      • reg.exe (PID: 3436)

    • Executing commands from a ".bat" file

      • YellowSkull 2.0.exe (PID: 7076)

    • Creates file in the systems drive root

      • cmd.exe (PID: 6400)

    • The executable file from the user directory is run by the CMD process

      • bg.exe (PID: 7136)
      • YSkullLock.exe (PID: 3152)

    • Uses REG/REGEDIT.EXE to modify registry

      • cmd.exe (PID: 6400)

    • Uses TASKKILL.EXE to kill process

      • cmd.exe (PID: 6400)

    • The process executes VB scripts

      • cmd.exe (PID: 6400)

  • INFO

    • The sample compiled with english language support

      • YellowSkull 2.0.exe (PID: 7076)
      • WinRAR.exe (PID: 6200)

    • Process checks computer location settings

      • YellowSkull 2.0.exe (PID: 7076)

    • Checks supported languages

      • YellowSkull 2.0.exe (PID: 7076)
      • bg.exe (PID: 7136)
      • YSkullLock.exe (PID: 3152)

    • Executable content was dropped or overwritten

      • WinRAR.exe (PID: 6200)

    • Reads the computer name

      • YellowSkull 2.0.exe (PID: 7076)
      • YSkullLock.exe (PID: 3152)
      • bg.exe (PID: 7136)

    • The sample compiled with german language support

      • WinRAR.exe (PID: 6200)

    • The process uses the downloaded file

      • YellowSkull 2.0.exe (PID: 7076)
      • WinRAR.exe (PID: 6200)
      • cmd.exe (PID: 6400)

    • Create files in a temporary directory

      • YellowSkull 2.0.exe (PID: 7076)
Find more information about signature artifacts and mapping to MITRE ATT&CK™ MATRIX at the full report
No Malware configuration.

TRiD

.zip | ZIP compressed archive (100)

EXIF

ZIP

ZipFileName: YellowSkull 2.0.exe
ZipUncompressedSize: 2592768
ZipCompressedSize: 2590019
ZipCRC: 0x8a0ce909
ZipModifyDate: 2022:03:21 14:40:32
ZipCompression: Deflated
ZipBitFlag: -
ZipRequiredVersion: 20
No data.
screenshotscreenshotscreenshotscreenshotscreenshotscreenshotscreenshotscreenshot
All screenshots are available in the full report
All screenshots are available in the full report
Total processes
179
Monitored processes
53
Malicious processes
2
Suspicious processes
2

Behavior graph

Click at the process to see the details
start winrar.exe yellowskull 2.0.exe no specs yellowskull 2.0.exe cmd.exe conhost.exe no specs reg.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs rundll32.exe no specs taskkill.exe no specs reg.exe no specs reg.exe no specs reg.exe no specs reg.exe no specs reg.exe no specs reg.exe no specs reg.exe no specs bg.exe no specs yskulllock.exe no specs reg.exe wscript.exe no specs

Process information

PID
CMD
Path
Indicators
Parent process
6200"C:\Program Files\WinRAR\WinRAR.exe" "C:\Users\admin\AppData\Local\Temp\YellowSkull 2.0.zip"C:\Program Files\WinRAR\WinRAR.exe
explorer.exe
User:
admin
Company:
Alexander Roshal
Integrity Level:
MEDIUM
Description:
WinRAR archiver
Version:
5.91.0
Modules
Images
c:\program files\winrar\winrar.exe
c:\windows\system32\ntdll.dll
c:\windows\system32\kernel32.dll
c:\windows\system32\kernelbase.dll
c:\windows\system32\user32.dll
c:\windows\system32\win32u.dll
c:\windows\system32\gdi32.dll
c:\windows\system32\gdi32full.dll
c:\windows\system32\msvcp_win.dll
c:\windows\system32\ucrtbase.dll
6988"C:\Users\admin\AppData\Local\Temp\Rar$EXa6200.35991\YellowSkull 2.0.exe" C:\Users\admin\AppData\Local\Temp\Rar$EXa6200.35991\YellowSkull 2.0.exe—WinRAR.exe
User:
admin
Integrity Level:
MEDIUM
Exit code:
3221226540
Modules
Images
c:\users\admin\appdata\local\temp\rar$exa6200.35991\yellowskull 2.0.exe
c:\windows\system32\ntdll.dll
c:\windows\syswow64\ntdll.dll
7076"C:\Users\admin\AppData\Local\Temp\Rar$EXa6200.35991\YellowSkull 2.0.exe" C:\Users\admin\AppData\Local\Temp\Rar$EXa6200.35991\YellowSkull 2.0.exe
WinRAR.exe
User:
admin
Integrity Level:
HIGH
Exit code:
0
Modules
Images
c:\users\admin\appdata\local\temp\rar$exa6200.35991\yellowskull 2.0.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\apphelp.dll
c:\windows\syswow64\gdi32.dll
6400C:\WINDOWS\system32\cmd.exe /c ""C:\Users\admin\AppData\Local\Temp\C392.tmp\YellowSkull2.bat" "C:\Windows\SysWOW64\cmd.exe
YellowSkull 2.0.exe
User:
admin
Company:
Microsoft Corporation
Integrity Level:
HIGH
Description:
Windows Command Processor
Exit code:
0
Version:
10.0.19041.3636 (WinBuild.160101.0800)
Modules
Images
c:\windows\syswow64\cmd.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\apphelp.dll
c:\windows\syswow64\msvcrt.dll
1684\??\C:\WINDOWS\system32\conhost.exe 0xffffffff -ForceV1C:\Windows\System32\conhost.exe—cmd.exe
User:
admin
Company:
Microsoft Corporation
Integrity Level:
HIGH
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
3436reg add "HKEY_CURRENT_USER\Control Panel\Desktop" /v Wallpaper /t REG_SZ /d c:\yellowskull.bmp /fC:\Windows\SysWOW64\reg.exe—cmd.exe
User:
admin
Company:
Microsoft Corporation
Integrity Level:
HIGH
Description:
Registry Console Tool
Exit code:
0
Version:
10.0.19041.1 (WinBuild.160101.0800)
Modules
Images
c:\windows\syswow64\reg.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\apphelp.dll
c:\windows\syswow64\msvcrt.dll
2676RUNDLL32.EXE user32.dll,UpdatePerUserSystemParametersC:\Windows\SysWOW64\rundll32.exe—cmd.exe
User:
admin
Company:
Microsoft Corporation
Integrity Level:
HIGH
Description:
Windows host process (Rundll32)
Exit code:
0
Version:
10.0.19041.3636 (WinBuild.160101.0800)
Modules
Images
c:\windows\syswow64\rundll32.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\apphelp.dll
c:\windows\syswow64\aclayers.dll
4384RUNDLL32.EXE user32.dll,UpdatePerUserSystemParametersC:\Windows\SysWOW64\rundll32.exe—cmd.exe
User:
admin
Company:
Microsoft Corporation
Integrity Level:
HIGH
Description:
Windows host process (Rundll32)
Exit code:
0
Version:
10.0.19041.3636 (WinBuild.160101.0800)
Modules
Images
c:\windows\syswow64\rundll32.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\apphelp.dll
c:\windows\syswow64\aclayers.dll
3080RUNDLL32.EXE user32.dll,UpdatePerUserSystemParametersC:\Windows\SysWOW64\rundll32.exe—cmd.exe
User:
admin
Company:
Microsoft Corporation
Integrity Level:
HIGH
Description:
Windows host process (Rundll32)
Exit code:
0
Version:
10.0.19041.3636 (WinBuild.160101.0800)
Modules
Images
c:\windows\syswow64\rundll32.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\apphelp.dll
c:\windows\syswow64\aclayers.dll
2928RUNDLL32.EXE user32.dll,UpdatePerUserSystemParametersC:\Windows\SysWOW64\rundll32.exe—cmd.exe
User:
admin
Company:
Microsoft Corporation
Integrity Level:
HIGH
Description:
Windows host process (Rundll32)
Exit code:
0
Version:
10.0.19041.3636 (WinBuild.160101.0800)
Modules
Images
c:\windows\syswow64\rundll32.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\apphelp.dll
c:\windows\syswow64\aclayers.dll
Total events
5 685
Read events
5 667
Write events
18
Delete events
0

Modification events

(PID) Process:(6200) WinRAR.exeKey:HKEY_CURRENT_USER\SOFTWARE\WinRAR\ArcHistory
Operation:writeName:3
Value:
C:\Users\admin\Desktop\preferences.zip
(PID) Process:(6200) WinRAR.exeKey:HKEY_CURRENT_USER\SOFTWARE\WinRAR\ArcHistory
Operation:writeName:2
Value:
C:\Users\admin\Desktop\chromium_ext.zip
(PID) Process:(6200) WinRAR.exeKey:HKEY_CURRENT_USER\SOFTWARE\WinRAR\ArcHistory
Operation:writeName:1
Value:
C:\Users\admin\Desktop\omni_23_10_2024_.zip
(PID) Process:(6200) WinRAR.exeKey:HKEY_CURRENT_USER\SOFTWARE\WinRAR\ArcHistory
Operation:writeName:0
Value:
C:\Users\admin\AppData\Local\Temp\YellowSkull 2.0.zip
(PID) Process:(6200) WinRAR.exeKey:HKEY_CURRENT_USER\SOFTWARE\WinRAR\FileList\FileColumnWidths
Operation:writeName:name
Value:
120
(PID) Process:(6200) WinRAR.exeKey:HKEY_CURRENT_USER\SOFTWARE\WinRAR\FileList\FileColumnWidths
Operation:writeName:size
Value:
80
(PID) Process:(6200) WinRAR.exeKey:HKEY_CURRENT_USER\SOFTWARE\WinRAR\FileList\FileColumnWidths
Operation:writeName:type
Value:
120
(PID) Process:(6200) WinRAR.exeKey:HKEY_CURRENT_USER\SOFTWARE\WinRAR\FileList\FileColumnWidths
Operation:writeName:mtime
Value:
100
(PID) Process:(3436) reg.exeKey:HKEY_CURRENT_USER\Control Panel\Desktop
Operation:writeName:Wallpaper
Value:
c:\yellowskull.bmp
(PID) Process:(6864) reg.exeKey:HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
Operation:writeName:DisableTaskMgr
Value:
1
Executable files
5
Suspicious files
1
Text files
7
Unknown types
1

Dropped files

PID
Process
Filename
Type
7076YellowSkull 2.0.exeC:\Users\admin\AppData\Local\Temp\C392.tmp\bg.wavwav
MD5:832B350B50A07906C630A2B8819FD209
SHA256:94E1CECF8ED740EA45C87927DE31005C3B2F9DB261AAE04FE56A81E337D1E8DA
7076YellowSkull 2.0.exeC:\Users\admin\AppData\Local\Temp\C392.tmp\bg.exeexecutable
MD5:12CF508E9058E3E67CF8A736557C2749
SHA256:B3670EC42931E2DEA3E03053EDA32240D8B6DB15BF89D0C74E23E99ECB0AAF49
7076YellowSkull 2.0.exeC:\Users\admin\AppData\Local\Temp\C392.tmp\YSkullMBRSetup.exeexecutable
MD5:220303EB72EBDE4605116640FB719B26
SHA256:F081C913488C3F22B62F906DAC2A82A38D085EBE1D28701F0059DFDFBF1CCF42
6200WinRAR.exeC:\Users\admin\AppData\Local\Temp\Rar$EXa6200.35991\Yellow Skull 2.0 Source.zipcompressed
MD5:461366366B36A48ECCAF3CE181862CB7
SHA256:7243123D7A3CE88D732AAB8CDEEE468D2ADC2700AC5BE304C91A984AA13611E1
7076YellowSkull 2.0.exeC:\Users\admin\AppData\Local\Temp\C392.tmp\YSkullLock.exeexecutable
MD5:2191C3A14B53531E82726B17DD331CEF
SHA256:3B2ABD3773E4678100F197F53A886EC833FD2E26AA9A94D780A2D22BEFDF7D44
7076YellowSkull 2.0.exeC:\Users\admin\AppData\Local\Temp\C392.tmp\YellowSkull2.battext
MD5:4671D5895D88BC19645CAB0FC7CA398A
SHA256:DD8AA9F7955674A7A1B5B222D7C1809C583C705DAE8BF476CDD42EFCC0AFABB5
7076YellowSkull 2.0.exeC:\Users\admin\AppData\Local\Temp\C392.tmp\bg.cpptext
MD5:A4F885352ED45CF37331BD01EC5B838A
SHA256:7032FD15B3B95CC3F0637BB8F8463E0848B5C2767C1CF4109EC34D7E2861322C
6200WinRAR.exeC:\Users\admin\AppData\Local\Temp\Rar$EXa6200.35991\readme.txttext
MD5:A2A8F6716FE5889F704616038368DE82
SHA256:3C26F7E09E30073AE5609073A7B711089F03A0731BC6616B8366496DA67FDF88
7076YellowSkull 2.0.exeC:\Users\admin\AppData\Local\Temp\C392.tmp\YellowSkull.bmpimage
MD5:11BCDA64D254AD8DC591B41F8FCEB04D
SHA256:84C5DAD2D4CEC5B636C1FAE6F1E1482ADA9F62363DCF269B4A86F6070D5B50FC
7076YellowSkull 2.0.exeC:\Users\admin\AppData\Local\Temp\C392.tmp\YSkullMBRSetup.cpptext
MD5:47E463410CB8131ADACC9DCC7259D18B
SHA256:4A72771CA59099094242F733D396F775946ED59E03C2AD680517530CA8A070B7
Download PCAP, analyze network streams, HTTP content and a lot more at the full report
HTTP(S) requests
9
TCP/UDP connections
33
DNS requests
18
Threats
0

HTTP requests

PID
Process
Method
HTTP Code
IP
URL
CN
Type
Size
Reputation
6168
backgroundTaskHost.exe
GET
200
192.229.221.95:80
http://ocsp.digicert.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBQ50otx%2Fh0Ztl%2Bz8SiPI7wEWVxDlQQUTiJUIBiV5uNu5g%2F6%2BrkS7QYXjzkCEAn5bsKVVV8kdJ6vHl3O1J0%3D
unknown
—
—
whitelisted
6856
SIHClient.exe
GET
200
88.221.169.152:80
http://www.microsoft.com/pkiops/crl/Microsoft%20ECC%20Product%20Root%20Certificate%20Authority%202018.crl
unknown
—
—
whitelisted
4712
MoUsoCoreWorker.exe
GET
200
23.53.40.178:80
http://crl.microsoft.com/pki/crl/products/MicRooCerAut2011_2011_03_22.crl
unknown
—
—
whitelisted
—
—
GET
200
23.53.40.178:80
http://crl.microsoft.com/pki/crl/products/MicRooCerAut2011_2011_03_22.crl
unknown
—
—
whitelisted
4712
MoUsoCoreWorker.exe
GET
200
184.30.21.171:80
http://www.microsoft.com/pkiops/crl/MicSecSerCA2011_2011-10-18.crl
unknown
—
—
whitelisted
—
—
GET
200
192.229.221.95:80
http://ocsp.digicert.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBTrjrydRyt%2BApF3GSPypfHBxR5XtQQUs9tIpPmhxdiuNkHMEWNpYim8S8YCEAI5PUjXAkJafLQcAAsO18o%3D
unknown
—
—
whitelisted
6168
backgroundTaskHost.exe
GET
200
192.229.221.95:80
http://ocsp.digicert.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBQ50otx%2Fh0Ztl%2Bz8SiPI7wEWVxDlQQUTiJUIBiV5uNu5g%2F6%2BrkS7QYXjzkCEAUZZSZEml49Gjh0j13P68w%3D
unknown
—
—
whitelisted
6856
SIHClient.exe
GET
200
88.221.169.152:80
http://www.microsoft.com/pkiops/crl/Microsoft%20ECC%20Update%20Secure%20Server%20CA%202.1.crl
unknown
—
—
whitelisted
1176
svchost.exe
GET
200
192.229.221.95:80
http://ocsp.digicert.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBSAUQYBMq2awn1Rh6Doh%2FsBYgFV7gQUA95QNVbRTLtm8KPiGxvDl7I90VUCEAJ0LqoXyo4hxxe7H%2Fz9DKA%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
2380
svchost.exe
51.124.78.146:443
settings-win.data.microsoft.com
MICROSOFT-CORP-MSN-AS-BLOCK
NL
whitelisted
—
—
51.124.78.146:443
settings-win.data.microsoft.com
MICROSOFT-CORP-MSN-AS-BLOCK
NL
whitelisted
4712
MoUsoCoreWorker.exe
23.53.40.178:80
crl.microsoft.com
Akamai International B.V.
DE
whitelisted
—
—
23.53.40.178:80
crl.microsoft.com
Akamai International B.V.
DE
whitelisted
4712
MoUsoCoreWorker.exe
184.30.21.171:80
www.microsoft.com
AKAMAI-AS
DE
whitelisted
5064
SearchApp.exe
104.126.37.139:443
www.bing.com
Akamai International B.V.
DE
whitelisted
—
—
192.229.221.95:80
ocsp.digicert.com
EDGECAST
US
whitelisted
4
System
192.168.100.255:138
—
—
—
whitelisted
1176
svchost.exe
20.190.159.0:443
login.live.com
MICROSOFT-CORP-MSN-AS-BLOCK
IE
whitelisted

DNS requests

Domain
IP
Reputation
settings-win.data.microsoft.com
  • 51.124.78.146
  • 51.104.136.2
  • 20.73.194.208
whitelisted
crl.microsoft.com
  • 23.53.40.178
  • 23.53.40.176
whitelisted
www.microsoft.com
  • 184.30.21.171
  • 88.221.169.152
whitelisted
google.com
  • 142.250.185.142
whitelisted
www.bing.com
  • 104.126.37.139
  • 104.126.37.131
  • 104.126.37.163
  • 104.126.37.128
  • 104.126.37.145
whitelisted
ocsp.digicert.com
  • 192.229.221.95
whitelisted
login.live.com
  • 20.190.159.0
  • 20.190.159.2
  • 20.190.159.75
  • 20.190.159.68
  • 20.190.159.73
  • 20.190.159.64
  • 20.190.159.23
  • 40.126.31.69
whitelisted
go.microsoft.com
  • 184.30.17.189
whitelisted
slscr.update.microsoft.com
  • 20.109.210.53
whitelisted
arc.msn.com
  • 20.103.156.88
whitelisted

Threats

No threats detected
No debug info
Interactive malware hunting service ANY.RUN
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Reports
YellowSkull 2.0.zip