xworm | db17812e10401ae3cdc44e07272758c155e215ccc2d4859833d7a26e38706d92

Analysis

max time kernel
144s
max time network
149s
platform
windows11-21h2_x64
resource
win11-20240426-en
resource tags

arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
submitted
26/05/2024, 15:38

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General

Target
siski.exe
Size 88KB
Sample240526-s3e1cabd4v
SHA256 db17812e10401ae3cdc44e07272758c155e215ccc2d4859833d7a26e38706d92
MD5 a39a9dbad030467f590832a6ab2ff349
SHA1 23b9baed2339451a3dc0d710024e4f010fc89be8
SHA512 1ea795f981ecf0abb66c2fc2e1704e5292e319d8ff8d24a7e52b05b03125dc24d46f3b80a5f89acedd7361f0adfc7150a3707f9d41a2b4202e7cd014d359232c
SSDEEP 1536:f62bFTb1Y/aBjS2jklqQZyoJPbUu6Ejbg/YVk36H2VLOO/V2G/cR:t5TyCZjks0ymbttnrVkxLOO2McR
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

character-estimate.gl.at.ply.gg:61192

Attributes

Install_directory
%ProgramData%
install_file
Chrome.exe

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral4/memory/5000-0-0x0000000000980000-0x000000000099C000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
2348	powershell.exe
2452	powershell.exe
4260	powershell.exe
3432	powershell.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Chrome.lnk	siski.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Chrome.lnk	siski.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2551177587-3778486488-1329702901-1000\Software\Microsoft\Windows\CurrentVersion\Run\Chrome = "C:\\ProgramData\\Chrome.exe"	siski.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
1	ip-api.com

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
3432	powershell.exe
3432	powershell.exe
2348	powershell.exe
2348	powershell.exe
2452	powershell.exe
2452	powershell.exe
4260	powershell.exe
4260	powershell.exe
5000	siski.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	5000	siski.exe
Token: SeDebugPrivilege	3432	powershell.exe
Token: SeDebugPrivilege	2348	powershell.exe
Token: SeDebugPrivilege	2452	powershell.exe
Token: SeDebugPrivilege	4260	powershell.exe
Token: SeDebugPrivilege	5000	siski.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5000	siski.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 5000 wrote to memory of 3432	5000	siski.exe	82
PID 5000 wrote to memory of 3432	5000	siski.exe	82
PID 5000 wrote to memory of 2348	5000	siski.exe	84
PID 5000 wrote to memory of 2348	5000	siski.exe	84
PID 5000 wrote to memory of 2452	5000	siski.exe	86
PID 5000 wrote to memory of 2452	5000	siski.exe	86
PID 5000 wrote to memory of 4260	5000	siski.exe	88
PID 5000 wrote to memory of 4260	5000	siski.exe	88

C:\Users\Admin\AppData\Local\Temp\siski.exe
"C:\Users\Admin\AppData\Local\Temp\siski.exe"
1⤵
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:5000
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\siski.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3432
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'siski.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2348
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\ProgramData\Chrome.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2452
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Chrome.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4260

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

powershell.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
Size 2KB
SHA256 85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c
MD5 627073ee3ca9676911bee35548eff2b8
SHA1 4c4b68c65e2cab9864b51167d710aa29ebdcff2e
SHA512 3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 0ee052d5333fd5fd86bc84856fec98e045f077a7ac8051651bf7c521b9706888
MD5 1a9fa92a4f2e2ec9e244d43a6a4f8fb9
SHA1 9910190edfaccece1dfcc1d92e357772f5dae8f7
SHA512 5d2361476fa22200e6f83883efe7dcb8c3fe7dae8d56e04e28a36e9ae1270c327b6aa161d92b239593da7661289d002c574446ecfd6bd19928209aae25e3ef64
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 c0794e2b7036ce5612446a8b15e0c8387773bbc921f63cf8849f8a1f4ef3878c
MD5 4093e5ab3812960039eba1a814c2ffb0
SHA1 b5e4a98a80be72fccd3cc910e93113d2febef298
SHA512 f3555b45aa1a1dd5214716dc81a05905c4ecd5a3e1276d35e08c65623ab1d14d469b3b576a5d9638264c1222d73889d2cc1ee43fb579d9ca3fcddd9f557cac7b
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 d7d665a42f940443efb28eb231dfe1c4062394e71fba145d6eea9ec075b0f0e8
MD5 aa6b748cd8f3e3c0e41549529b919e21
SHA1 5a4b9721f9fb5042f6ef7afd698d5ac5216a88bb
SHA512 361c523f49428a7e430279099e669a1a8af8764653f42e83105c0da3f8e8dd3be6c1719ea8c158d8f2e8425d74457147a4683190eb4a67019b9d02be44c13534
MD5 SHA1 SHA512

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__PSScriptPolicyTest_vwlvdq4k.rjn.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_vwlvdq4k.rjn.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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memory/3432-12-0x00007FFF0D8F0000-0x00007FFF0E3B2000-memory.dmp

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memory/3432-13-0x00000249AE330000-0x00000249AE352000-memory.dmp

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memory/3432-14-0x00007FFF0D8F0000-0x00007FFF0E3B2000-memory.dmp

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memory/3432-15-0x00007FFF0D8F0000-0x00007FFF0E3B2000-memory.dmp

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memory/3432-18-0x00007FFF0D8F0000-0x00007FFF0E3B2000-memory.dmp

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memory/3432-19-0x00007FFF0D8F0000-0x00007FFF0E3B2000-memory.dmp

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memory/3432-11-0x00007FFF0D8F0000-0x00007FFF0E3B2000-memory.dmp

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memory/5000-1-0x00007FFF0D8F3000-0x00007FFF0D8F5000-memory.dmp

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memory/5000-2-0x00007FFF0D8F0000-0x00007FFF0E3B2000-memory.dmp

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memory/5000-0-0x0000000000980000-0x000000000099C000-memory.dmp

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memory/5000-55-0x00007FFF0D8F0000-0x00007FFF0E3B2000-memory.dmp

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