xworm | 4a643c8ac145763b7e4a9b410a5dcc3562faf0f2204ec0d2613833923628f419

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
behavioral2/files/0x00090000000235e3-11.dat	family_xworm
behavioral2/memory/2644-13-0x00000000008C0000-0x00000000008D8000-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
4648	powershell.exe
4680	powershell.exe
3232	powershell.exe
4412	powershell.exe

Checks computer location settings 2 TTPs 2 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-1-5-21-1181767204-2009306918-3718769404-1000\Control Panel\International\Geo\Nation	B1OdUv8CBH.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000\Control Panel\International\Geo\Nation	clientlol.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 5 IoCs

pid	Process
2644	clientlol.exe
3672	KrampUI.exe
3944	svchost
636	svchost
4412	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-1-5-21-1181767204-2009306918-3718769404-1000\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
11	pastebin.com
12	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
8	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
4488	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2644	clientlol.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
4648	powershell.exe
4648	powershell.exe
4680	powershell.exe
4680	powershell.exe
3232	powershell.exe
3232	powershell.exe
4412	powershell.exe
4412	powershell.exe
2644	clientlol.exe

Suspicious use of AdjustPrivilegeToken 9 IoCs

description	pid	Process
Token: SeDebugPrivilege	2644	clientlol.exe
Token: SeDebugPrivilege	4648	powershell.exe
Token: SeDebugPrivilege	4680	powershell.exe
Token: SeDebugPrivilege	3232	powershell.exe
Token: SeDebugPrivilege	4412	powershell.exe
Token: SeDebugPrivilege	2644	clientlol.exe
Token: SeDebugPrivilege	3944	svchost
Token: SeDebugPrivilege	636	svchost
Token: SeDebugPrivilege	4412	svchost

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
3672	KrampUI.exe
3672	KrampUI.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3672	KrampUI.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2644	clientlol.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3508 wrote to memory of 2644	3508	B1OdUv8CBH.exe	90
PID 3508 wrote to memory of 2644	3508	B1OdUv8CBH.exe	90
PID 3508 wrote to memory of 3672	3508	B1OdUv8CBH.exe	91
PID 3508 wrote to memory of 3672	3508	B1OdUv8CBH.exe	91
PID 2644 wrote to memory of 4648	2644	clientlol.exe	93
PID 2644 wrote to memory of 4648	2644	clientlol.exe	93
PID 2644 wrote to memory of 4680	2644	clientlol.exe	95
PID 2644 wrote to memory of 4680	2644	clientlol.exe	95
PID 2644 wrote to memory of 3232	2644	clientlol.exe	97
PID 2644 wrote to memory of 3232	2644	clientlol.exe	97
PID 2644 wrote to memory of 4412	2644	clientlol.exe	100
PID 2644 wrote to memory of 4412	2644	clientlol.exe	100
PID 2644 wrote to memory of 4488	2644	clientlol.exe	102
PID 2644 wrote to memory of 4488	2644	clientlol.exe	102

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⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3508
- C:\ProgramData\clientlol.exe
  "C:\ProgramData\clientlol.exe"
  2⤵
  - Checks computer location settings
  - 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:2644
- - 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:4648
- - 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:4680
- - 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:3232
- - 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
    - Suspicious use of AdjustPrivilegeToken
    PID:4412
- - 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:4488
- C:\ProgramData\KrampUI.exe
  "C:\ProgramData\KrampUI.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  PID:3672

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=4324,i,13879737908471496610,15335851594401413307,262144 --variations-seed-version --mojo-platform-channel-handle=4232 /prefetch:8
1⤵
PID:2080

C:\ProgramData\svchost
C:\ProgramData\svchost
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3944

C:\ProgramData\svchost
C:\ProgramData\svchost
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:636

C:\ProgramData\svchost
C:\ProgramData\svchost
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4412

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

Scheduled Task/Job

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

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\svchost.log

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

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

Filesize
944B

MD5
6d42b6da621e8df5674e26b799c8e2aa

SHA1
ab3ce1327ea1eeedb987ec823d5e0cb146bafa48

SHA256
5ab6a1726f425c6d0158f55eb8d81754ddedd51e651aa0a899a29b7a58619c4c

SHA512
53faffbda8a835bc1143e894c118c15901a5fd09cfc2224dd2f754c06dc794897315049a579b9a8382d4564f071576045aaaf824019b7139d939152dca38ce29

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

Filesize
944B

MD5
a7cc007980e419d553568a106210549a

SHA1
c03099706b75071f36c3962fcc60a22f197711e0

SHA256
a5735921fc72189c8bf577f3911486cf031708dc8d6bc764fe3e593c0a053165

SHA512
b9aaf29403c467daef80a1ae87478afc33b78f4e1ca16189557011bb83cf9b3e29a0f85c69fa209c45201fb28baca47d31756eee07b79c6312c506e8370f7666

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

Filesize
944B

MD5
34f595487e6bfd1d11c7de88ee50356a

SHA1
4caad088c15766cc0fa1f42009260e9a02f953bb

SHA256
0f9a4b52e01cb051052228a55d0515911b7ef5a8db3cf925528c746df511424d

SHA512
10976c5deaf9fac449e703e852c3b08d099f430de2d7c7b8e2525c35d63e28b890e5aab63feff9b20bca0aaf9f35a3ba411aee3fbeee9ea59f90ed25bd617a0b

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_mhf1blxe.2dg.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2644-13-0x00000000008C0000-0x00000000008D8000-memory.dmp

Filesize
96KB

Download
memory/2644-27-0x00007FF842670000-0x00007FF843131000-memory.dmp

Filesize
10.8MB

Download
memory/2644-14-0x00007FF842670000-0x00007FF843131000-memory.dmp

Filesize
10.8MB

Download
memory/2644-78-0x00007FF842670000-0x00007FF843131000-memory.dmp

Filesize
10.8MB

Download
memory/2644-79-0x00007FF842670000-0x00007FF843131000-memory.dmp

Filesize
10.8MB

Download
memory/3508-0-0x00007FF842673000-0x00007FF842675000-memory.dmp

Filesize
8KB

Download
memory/3508-1-0x0000000000170000-0x000000000143E000-memory.dmp

Filesize
18.8MB

Download
memory/4648-33-0x0000024CF08F0000-0x0000024CF0912000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads