xworm | 4a643c8ac145763b7e4a9b410a5dcc3562faf0f2204ec0d2613833923628f419

Analysis

max time kernel
133s
max time network
151s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
27-05-2024 04:55

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General

Target

Krampus/Krampus/B1OdUv8CBH.exe
Size

18.8MB
MD5

c5df5afb4679cbea28de24ff9ed306a2
SHA1

fe968a913c1377f0e85cc4c95afa3129a2f9ae22
SHA256

a12756e652171e06da8133a7abe625316b3d352fc82ed8cf199f349b7de0c478
SHA512

a4ddb32c744da55829823feb140c2c48612d442459ec76daf7ec0459327e8422222a380c53802c15b298cf122f1f86fe2891b2bf04732ef764d62fb182cd7e70
SSDEEP

196608:EXi2sOT7HnJ+7CBgHcyCkaIH2kkoyhr5QXNDe6JaCPU8rblcRHrdcKZ5CRO2HACB:ci07we4+TB6zxJcRBdCrHxwwR

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%ProgramData%
install_file
USB.exe
pastebin_url
https://pastebin.com/raw/a1kmrNub

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral1/files/0x000900000001ab43-5.dat	family_xworm
behavioral1/memory/5064-7-0x00000000001F0000-0x0000000000208000-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
2808	powershell.exe
4792	powershell.exe
4084	powershell.exe
3576	powershell.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 4 IoCs

pid	Process
5064	clientlol.exe
224	KrampUI.exe
3668	svchost
4996	svchost

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-1-5-21-4106386276-4127174233-3637007343-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchost = "C:\\ProgramData\\svchost"	clientlol.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
4	pastebin.com
5	pastebin.com

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

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
5052	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
5064	clientlol.exe

Suspicious behavior: EnumeratesProcesses 13 IoCs

pid	Process
3576	powershell.exe
3576	powershell.exe
3576	powershell.exe
2808	powershell.exe
2808	powershell.exe
2808	powershell.exe
4792	powershell.exe
4792	powershell.exe
4792	powershell.exe
4084	powershell.exe
4084	powershell.exe
4084	powershell.exe
5064	clientlol.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	5064	clientlol.exe
Token: SeDebugPrivilege	3576	powershell.exe
Token: SeIncreaseQuotaPrivilege	3576	powershell.exe
Token: SeSecurityPrivilege	3576	powershell.exe
Token: SeTakeOwnershipPrivilege	3576	powershell.exe
Token: SeLoadDriverPrivilege	3576	powershell.exe
Token: SeSystemProfilePrivilege	3576	powershell.exe
Token: SeSystemtimePrivilege	3576	powershell.exe
Token: SeProfSingleProcessPrivilege	3576	powershell.exe
Token: SeIncBasePriorityPrivilege	3576	powershell.exe
Token: SeCreatePagefilePrivilege	3576	powershell.exe
Token: SeBackupPrivilege	3576	powershell.exe
Token: SeRestorePrivilege	3576	powershell.exe
Token: SeShutdownPrivilege	3576	powershell.exe
Token: SeDebugPrivilege	3576	powershell.exe
Token: SeSystemEnvironmentPrivilege	3576	powershell.exe
Token: SeRemoteShutdownPrivilege	3576	powershell.exe
Token: SeUndockPrivilege	3576	powershell.exe
Token: SeManageVolumePrivilege	3576	powershell.exe
Token: 33	3576	powershell.exe
Token: 34	3576	powershell.exe
Token: 35	3576	powershell.exe
Token: 36	3576	powershell.exe
Token: SeDebugPrivilege	2808	powershell.exe
Token: SeIncreaseQuotaPrivilege	2808	powershell.exe
Token: SeSecurityPrivilege	2808	powershell.exe
Token: SeTakeOwnershipPrivilege	2808	powershell.exe
Token: SeLoadDriverPrivilege	2808	powershell.exe
Token: SeSystemProfilePrivilege	2808	powershell.exe
Token: SeSystemtimePrivilege	2808	powershell.exe
Token: SeProfSingleProcessPrivilege	2808	powershell.exe
Token: SeIncBasePriorityPrivilege	2808	powershell.exe
Token: SeCreatePagefilePrivilege	2808	powershell.exe
Token: SeBackupPrivilege	2808	powershell.exe
Token: SeRestorePrivilege	2808	powershell.exe
Token: SeShutdownPrivilege	2808	powershell.exe
Token: SeDebugPrivilege	2808	powershell.exe
Token: SeSystemEnvironmentPrivilege	2808	powershell.exe
Token: SeRemoteShutdownPrivilege	2808	powershell.exe
Token: SeUndockPrivilege	2808	powershell.exe
Token: SeManageVolumePrivilege	2808	powershell.exe
Token: 33	2808	powershell.exe
Token: 34	2808	powershell.exe
Token: 35	2808	powershell.exe
Token: 36	2808	powershell.exe
Token: SeDebugPrivilege	4792	powershell.exe
Token: SeIncreaseQuotaPrivilege	4792	powershell.exe
Token: SeSecurityPrivilege	4792	powershell.exe
Token: SeTakeOwnershipPrivilege	4792	powershell.exe
Token: SeLoadDriverPrivilege	4792	powershell.exe
Token: SeSystemProfilePrivilege	4792	powershell.exe
Token: SeSystemtimePrivilege	4792	powershell.exe
Token: SeProfSingleProcessPrivilege	4792	powershell.exe
Token: SeIncBasePriorityPrivilege	4792	powershell.exe
Token: SeCreatePagefilePrivilege	4792	powershell.exe
Token: SeBackupPrivilege	4792	powershell.exe
Token: SeRestorePrivilege	4792	powershell.exe
Token: SeShutdownPrivilege	4792	powershell.exe
Token: SeDebugPrivilege	4792	powershell.exe
Token: SeSystemEnvironmentPrivilege	4792	powershell.exe
Token: SeRemoteShutdownPrivilege	4792	powershell.exe
Token: SeUndockPrivilege	4792	powershell.exe
Token: SeManageVolumePrivilege	4792	powershell.exe
Token: 33	4792	powershell.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
224	KrampUI.exe
224	KrampUI.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
224	KrampUI.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5064	clientlol.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4616 wrote to memory of 5064	4616	B1OdUv8CBH.exe	74
PID 4616 wrote to memory of 5064	4616	B1OdUv8CBH.exe	74
PID 4616 wrote to memory of 224	4616	B1OdUv8CBH.exe	75
PID 4616 wrote to memory of 224	4616	B1OdUv8CBH.exe	75
PID 5064 wrote to memory of 3576	5064	clientlol.exe	77
PID 5064 wrote to memory of 3576	5064	clientlol.exe	77
PID 5064 wrote to memory of 2808	5064	clientlol.exe	80
PID 5064 wrote to memory of 2808	5064	clientlol.exe	80
PID 5064 wrote to memory of 4792	5064	clientlol.exe	82
PID 5064 wrote to memory of 4792	5064	clientlol.exe	82
PID 5064 wrote to memory of 4084	5064	clientlol.exe	84
PID 5064 wrote to memory of 4084	5064	clientlol.exe	84
PID 5064 wrote to memory of 5052	5064	clientlol.exe	86
PID 5064 wrote to memory of 5052	5064	clientlol.exe	86

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Krampus\Krampus\B1OdUv8CBH.exe
"C:\Users\Admin\AppData\Local\Temp\Krampus\Krampus\B1OdUv8CBH.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4616
- C:\ProgramData\clientlol.exe
  "C:\ProgramData\clientlol.exe"
  2⤵
  - Drops startup file
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5064
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\ProgramData\clientlol.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3576
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'clientlol.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2808
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\ProgramData\svchost'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4792
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'svchost'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    PID:4084
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "svchost" /tr "C:\ProgramData\svchost"
    3⤵
    - Creates scheduled task(s)
    PID:5052
- C:\ProgramData\KrampUI.exe
  "C:\ProgramData\KrampUI.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  PID:224

C:\ProgramData\svchost
C:\ProgramData\svchost
1⤵
- Executes dropped EXE
PID:3668

C:\ProgramData\svchost
C:\ProgramData\svchost
1⤵
- Executes dropped EXE
PID:4996

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

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

C:\ProgramData\KrampUI.exe

Filesize
17.3MB

MD5
ec02c6962ff0994f0dbc06133cb32f28

SHA1
1084bbf4c67fea18b2dd0232ad196f97ea17438c

SHA256
9663260edf06c3b9116a649af4c9fffa22f1bb3811f3e73e0f8fd6e3ba997565

SHA512
8d00d5f21209bb7ffa24ee7717db4e9294c720a62d50ee416ab6e6e6520afde1d9cacc3c364c2c4d81d3eb565efba29f9e815d384774ba0de0671496952418f6

Download Submit
C:\ProgramData\clientlol.exe

Filesize
1.5MB

MD5
da4f713eda91ee257714127d761852a3

SHA1
5901870facef99c9c850b141e8f8339721e932e4

SHA256
9d27a2b70745480a42b83777ea3aa0399c63a55c6d9b699d67f1e95f7605ebe1

SHA512
9964eca29700aefa97febdbca4e829a64ec6fd050d49c720f04963fab831b528319c9b3b054f36093ef9dc7236a681fba02f1f988ec19194f124d7a75abcddf7

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
3KB

MD5
8592ba100a78835a6b94d5949e13dfc1

SHA1
63e901200ab9a57c7dd4c078d7f75dcd3b357020

SHA256
fdd7d9def6f9f0c0f2e60dbc8a2d1999071cd7d3095e9e087bb1cda7a614ac3c

SHA512
87f98e6cb61b2a2a7d65710c4d33881d89715eb7a06e00d492259f35c3902498baabffc5886be0ec5a14312ad4c262e3fc40cd3a5cb91701af0fb229726b88c3

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\svchost.log

Filesize
654B

MD5
16c5fce5f7230eea11598ec11ed42862

SHA1
75392d4824706090f5e8907eee1059349c927600

SHA256
87ba77c13905298acbac72be90949c4fe0755b6eff9777615aa37f252515f151

SHA512
153edd6da59beea6cc411ed7383c32916425d6ebb65f04c65aab7c1d6b25443d143aa8449aa92149de0ad8a975f6ecaa60f9f7574536eec6b38fe5fd3a6c6adc

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
1KB

MD5
c1c2e2e8b3ac8d49845efeaafa0c84d8

SHA1
d0cf2a9b1c2230b6d113b4532f120cf5985deb42

SHA256
3395cac974bc6a3f9de2c48da93f6ab33db8d4dfca88a03457eb69b902870312

SHA512
c36db67259f35c5ae33e25029d645c7706841a5dc2c6e52148b89345ec3f2d1a02ab03d525c1bbe4ee8002b23a468c78e8ba124c4d58c1f9676dd058d1d83a16

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
1KB

MD5
187d4e411941aa2f50b1bd47e314b224

SHA1
440c4787378b50c760360f3b902bd414ba45f1b4

SHA256
b236c7aeed31f20140caf89cd9d496826953aba8e19cbd554326d0071a7779ce

SHA512
f24da9f2eea6c43da01928e1a863cf97761a2655925824d7b25c62657c0ff2115feb39bab8ef87b329ed83fc407d76961f59263b497c651646ca9e3f8db913ca

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
1KB

MD5
e70feea3e3dd66fb38669a354bd5422d

SHA1
04af0bf450b0aedef7eee29a2c0dd13fdac59b0e

SHA256
e68d9f1710e6ddc6c593efc567903b7f41524fb204a3f0c379ca9b066539c9c4

SHA512
1b264a3930ef2fb5198a33690741e4aa0fdac4720ae271bd78cba0598d065b1a8b5dfa6040c55af21eaa37488913d07420bb180ed04063fe9e01adf1bb39f616

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_2lftx5jc.13k.ps1

Filesize
1B

MD5
c4ca4238a0b923820dcc509a6f75849b

SHA1
356a192b7913b04c54574d18c28d46e6395428ab

SHA256
6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b

SHA512
4dff4ea340f0a823f15d3f4f01ab62eae0e5da579ccb851f8db9dfe84c58b2b37b89903a740e1ee172da793a6e79d560e5f7f9bd058a12a280433ed6fa46510a

Download Submit
memory/3576-26-0x00000218F8CE0000-0x00000218F8D56000-memory.dmp

Filesize
472KB

Download
memory/3576-21-0x00000218F8C00000-0x00000218F8C22000-memory.dmp

Filesize
136KB

Download
memory/4616-0-0x00007FF804D63000-0x00007FF804D64000-memory.dmp

Filesize
4KB

Download
memory/4616-1-0x0000000000E10000-0x00000000020DE000-memory.dmp

Filesize
18.8MB

Download
memory/5064-15-0x00007FF804D60000-0x00007FF80574C000-memory.dmp

Filesize
9.9MB

Download
memory/5064-8-0x00007FF804D60000-0x00007FF80574C000-memory.dmp

Filesize
9.9MB

Download
memory/5064-7-0x00000000001F0000-0x0000000000208000-memory.dmp

Filesize
96KB

Download
memory/5064-205-0x00007FF804D60000-0x00007FF80574C000-memory.dmp

Filesize
9.9MB

Download
memory/5064-206-0x00007FF804D60000-0x00007FF80574C000-memory.dmp

Filesize
9.9MB

Download