xworm | 15b874bf48138911f8e51bcd50b8fbfbb92b2195e841e8f019ec0a4bf43d0b3c

Analysis

max time kernel
146s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
14/06/2024, 05:53

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General

Target
workpls.exe
Size 80KB
Sample240614-glht5a1dqq
SHA256 15b874bf48138911f8e51bcd50b8fbfbb92b2195e841e8f019ec0a4bf43d0b3c
MD5 7c5b4c2fb85480f3b020cabc27349803
SHA1 b32c34e787dfc4caf435e136d24bf561568aaedb
SHA512 be8a1e88f5a9b3b022417aeecbe9a984f271434a64946ead097171311d66ae722be402f1f70d873c7db374ce32975a33edbd00d078c58c7dba0f294c958ed0b2
SSDEEP 1536:tsONV0sICTBhsZBjCDTVj+bE8v5Cq6+uz1d46aI498NOkYF1Z:ts32tOKl+bEf+cd0I3OkEX
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%AppData%
install_file
XClient.exe
pastebin_url
https://pastebin.com/raw/YetBwjAF

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral2/memory/1328-1-0x0000000000970000-0x000000000098A000-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
3624	powershell.exe
4368	powershell.exe
2684	powershell.exe
828	powershell.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation	workpls.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XClient.lnk	workpls.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XClient.lnk	workpls.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-1-5-21-4124900551-4068476067-3491212533-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Roaming\\XClient.exe"	workpls.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 10 IoCs

Web Service

T1102

flow	ioc
19	pastebin.com
22	pastebin.com
3	pastebin.com
17	pastebin.com
16	pastebin.com
18	pastebin.com
20	pastebin.com
21	pastebin.com
8	pastebin.com
14	pastebin.com

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
3624	powershell.exe
3624	powershell.exe
4368	powershell.exe
4368	powershell.exe
2684	powershell.exe
2684	powershell.exe
828	powershell.exe
828	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	1328	workpls.exe
Token: SeDebugPrivilege	3624	powershell.exe
Token: SeDebugPrivilege	4368	powershell.exe
Token: SeDebugPrivilege	2684	powershell.exe
Token: SeDebugPrivilege	828	powershell.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1328 wrote to memory of 3624	1328	workpls.exe	86
PID 1328 wrote to memory of 3624	1328	workpls.exe	86
PID 1328 wrote to memory of 4368	1328	workpls.exe	88
PID 1328 wrote to memory of 4368	1328	workpls.exe	88
PID 1328 wrote to memory of 2684	1328	workpls.exe	90
PID 1328 wrote to memory of 2684	1328	workpls.exe	90
PID 1328 wrote to memory of 828	1328	workpls.exe	92
PID 1328 wrote to memory of 828	1328	workpls.exe	92

C:\Users\Admin\AppData\Local\Temp\workpls.exe
"C:\Users\Admin\AppData\Local\Temp\workpls.exe"
1⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1328
- 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\workpls.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3624
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'workpls.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4368
- 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\Roaming\XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2684
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:828

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

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Web Service

T1102

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 84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f
MD5 d85ba6ff808d9e5444a4b369f5bc2730
SHA1 31aa9d96590fff6981b315e0b391b575e4c0804a
SHA512 8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 5ab6a1726f425c6d0158f55eb8d81754ddedd51e651aa0a899a29b7a58619c4c
MD5 6d42b6da621e8df5674e26b799c8e2aa
SHA1 ab3ce1327ea1eeedb987ec823d5e0cb146bafa48
SHA512 53faffbda8a835bc1143e894c118c15901a5fd09cfc2224dd2f754c06dc794897315049a579b9a8382d4564f071576045aaaf824019b7139d939152dca38ce29
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 d45581b0807a0d04a70ec75e3e4575e73f148e5b4e0d3d325dfbd6400a4bfbd1
MD5 d65ebc84c6b0b52901fb46f5e2b83ab5
SHA1 d036a0c3eb9e1616d0f7f5ca41171060c13a3095
SHA512 88ac232e7702ebd53788cf8429d266ae367111bfccf4bc9d40ead25b552347521458ca60d320e2775b5d2edcaf8501251cb2db68b38dc000ac50463fb80865be
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 d7c96f73a5074bd88297839f5e749996eb91510490acd18d16edd5751f087943
MD5 2bb005f08e40b9d8c31f1c09da44565d
SHA1 8a7097ecaeca704b6d653bfedea449cfbe79072f
SHA512 3da328cd8050288fcd5e9545812f5b0767aa9c19674d6f6f5dc35e92d436b2690056018910ff5a90f33c1f6d9602c70a256637d52498f1794efc8617fea6cbe3
MD5 SHA1 SHA512

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__PSScriptPolicyTest_h3ovoc1o.0im.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_h3ovoc1o.0im.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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memory/1328-1-0x0000000000970000-0x000000000098A000-memory.dmp

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memory/1328-0-0x00007FFE31143000-0x00007FFE31145000-memory.dmp

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memory/1328-58-0x00007FFE31140000-0x00007FFE31C01000-memory.dmp

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memory/1328-57-0x00007FFE31140000-0x00007FFE31C01000-memory.dmp

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memory/3624-2-0x00000167E9110000-0x00000167E9132000-memory.dmp

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memory/3624-18-0x00007FFE31140000-0x00007FFE31C01000-memory.dmp

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memory/3624-15-0x00007FFE31140000-0x00007FFE31C01000-memory.dmp

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memory/3624-14-0x00007FFE31140000-0x00007FFE31C01000-memory.dmp

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memory/3624-13-0x00007FFE31140000-0x00007FFE31C01000-memory.dmp

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memory/3624-12-0x00007FFE31140000-0x00007FFE31C01000-memory.dmp

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