xworm | 7a4255ae6f3b241f21c3c85beb25988e665c03675ce8c932e22903973cb6b79f

General

Target

DarkComet.exe
Size

8.2MB
MD5

c6641cb74bdd9e7f003dc6c9e67e1cab
SHA1

5251c38bfcc670befbb9f8bf77df70edd96ab07b
SHA256

cc38b7bb164fefe0d0d71a17cb09fb055b1cc14c2793ffa6341f70a7425fb249
SHA512

daba3b53a0fa0f0018d259364dfb5a417b00d9ff9688ca38a006a3cfa1ef9e86b4aadb70c444ed14944467024546570367324f71ce100deaaf3f39598ba2e874
SSDEEP

196608:z/pm75SOeWhEbgEpO2QfUG/f5rVcPU/YKdoAVY5pBoEOFD:51/UgQ/9VcPUJBSROl

Score

10^/10

xworm discovery execution persistence privilege_escalation rat trojan

Malware Config

Extracted

Family

xworm

Version

3.0

Attributes

Install_directory
%Public%
install_file
Utilman.exe
pastebin_url
https://pastebin.com/raw/LqnQsuPh
telegram
https://api.telegram.org/bot7737805452:AAF8gLCy7lakGIkiT8m22TUsfVQMxjiM1wE/sendMessage?chat_id=7044899953

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/files/0x0008000000023c87-30.dat	family_xworm
behavioral2/memory/1196-40-0x0000000000190000-0x00000000001A8000-memory.dmp	family_xworm

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

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

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

execution

PowerShell

T1059.001

pid	Process
3760	powershell.exe
2400	powershell.exe
216	powershell.exe

Checks computer location settings 2 TTPs 3 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-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	DarkComet.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	exe.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	Utilman.exe

Executes dropped EXE 5 IoCs

pid	Process
3244	exe.exe
3688	dc.exe
1196	Utilman.exe
744	Utilman.exe
2312	Utilman.exe

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

Web Service

T1102

flow	ioc
16	pastebin.com
15	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
12	ip-api.com

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

System Information Discovery
T1082
Event Triggered Execution: Accessibility Features 1 TTPs
Windows contains accessibility features that may be used by adversaries to establish persistence and/or elevate privileges.
persistence privilege_escalation

Accessibility Features
T1546.008

System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	DarkComet.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	dc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
3508	cmd.exe
4948	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4948	PING.EXE

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
4872	schtasks.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
3760	powershell.exe
3760	powershell.exe
2400	powershell.exe
2400	powershell.exe
216	powershell.exe
216	powershell.exe
1196	Utilman.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	1196	Utilman.exe
Token: SeDebugPrivilege	3760	powershell.exe
Token: SeDebugPrivilege	2400	powershell.exe
Token: SeDebugPrivilege	216	powershell.exe
Token: SeDebugPrivilege	1196	Utilman.exe
Token: SeDebugPrivilege	744	Utilman.exe
Token: SeDebugPrivilege	2312	Utilman.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1196	Utilman.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 3704 wrote to memory of 3244	3704	DarkComet.exe	82
PID 3704 wrote to memory of 3244	3704	DarkComet.exe	82
PID 3704 wrote to memory of 3688	3704	DarkComet.exe	83
PID 3704 wrote to memory of 3688	3704	DarkComet.exe	83
PID 3704 wrote to memory of 3688	3704	DarkComet.exe	83
PID 3704 wrote to memory of 3508	3704	DarkComet.exe	84
PID 3704 wrote to memory of 3508	3704	DarkComet.exe	84
PID 3704 wrote to memory of 3508	3704	DarkComet.exe	84
PID 3244 wrote to memory of 1196	3244	exe.exe	86
PID 3244 wrote to memory of 1196	3244	exe.exe	86
PID 3508 wrote to memory of 4948	3508	cmd.exe	87
PID 3508 wrote to memory of 4948	3508	cmd.exe	87
PID 3508 wrote to memory of 4948	3508	cmd.exe	87
PID 1196 wrote to memory of 3760	1196	Utilman.exe	96
PID 1196 wrote to memory of 3760	1196	Utilman.exe	96
PID 1196 wrote to memory of 2400	1196	Utilman.exe	98
PID 1196 wrote to memory of 2400	1196	Utilman.exe	98
PID 1196 wrote to memory of 216	1196	Utilman.exe	100
PID 1196 wrote to memory of 216	1196	Utilman.exe	100
PID 1196 wrote to memory of 4872	1196	Utilman.exe	102
PID 1196 wrote to memory of 4872	1196	Utilman.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\DarkComet.exe
"C:\Users\Admin\AppData\Local\Temp\DarkComet.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3704
- C:\Users\Admin\AppData\Local\Temp\exe.exe
  "C:\Users\Admin\AppData\Local\Temp\exe.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:3244
- - C:\Users\Admin\AppData\Local\Temp\Utilman.exe
    "C:\Users\Admin\AppData\Local\Temp\Utilman.exe"
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1196
  - - 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\Utilman.exe'
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:3760
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Utilman.exe'
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2400
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Public\Utilman.exe'
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:216
  - - C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Utilman" /tr "C:\Users\Public\Utilman.exe"
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:4872
- C:\Users\Admin\AppData\Local\Temp\dc.exe
  "C:\Users\Admin\AppData\Local\Temp\dc.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:3688
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\system32\cmd.exe" /c ping -n 3 127.0.0.1 & copy /Y "C:\Users\Admin\AppData\Local\Temp\dc.exe" "C:\Users\Admin\AppData\Local\Temp\DarkComet.exe" >> NUL
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:3508
- - C:\Windows\SysWOW64\PING.EXE
    ping -n 3 127.0.0.1
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:4948

C:\Users\Public\Utilman.exe
C:\Users\Public\Utilman.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:744

C:\Users\Public\Utilman.exe
C:\Users\Public\Utilman.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2312

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Event Triggered Execution

1

T1546

Accessibility Features

1

T1546.008

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Event Triggered Execution

1

T1546

Accessibility Features

1

T1546.008

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Utilman.exe.log

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

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

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

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
10890cda4b6eab618e926c4118ab0647

SHA1
1e1d63b73a0e6c7575f458b3c7917a9ce5ba776d

SHA256
00f8a035324d39bd62e6dee5e1b480069015471c487ebee4479e6990ea9ddb14

SHA512
a2ee84006c24a36f25e0bca0772430d64e3791f233da916aecdeae6712763e77d55bbbd00dc8f6b2b3887f3c26ab3980b96c5f46cc823e81e28abbbc5fc78221

Download Submit
C:\Users\Admin\AppData\Local\Temp\Utilman.exe

Filesize
75KB

MD5
c42a461d499e77fc64a3dafa3257bbd1

SHA1
983ad2a668a6288c158de07542d82bb6bb970ff7

SHA256
eb89c38989c24b4c08c14a8bffd518366955a14c9fefc3f63fb9397585b6e166

SHA512
369608c993d61dfdbed03c7820811b8062b52a5c6f81bcd745cef200959cd325425d777a8bd11e7300106b36b70d945845e8e2f1df9cfcfb8dad85ef67dff051

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_gxf2k3lv.2f5.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\dc.exe

Filesize
11.3MB

MD5
d761f3aa64064a706a521ba14d0f8741

SHA1
ab7382bcfdf494d0327fccce9c884592bcc1adeb

SHA256
21ca06b18698d14154a45822aaae1e3837d168cc7630bcd3ec3d8c68aaa959e6

SHA512
d2274c03f805a5cd62104492e154fc225c3f6997091accb2f4bff165308fc82ba0d9adf185ec744222bcb4ece08d1ba754a35a2d88c10c5743f4d2e66494377f

Download Submit
C:\Users\Admin\AppData\Local\Temp\exe.exe

Filesize
255KB

MD5
95d3044c971365f4d5db6bc22c640782

SHA1
856324404d13836d967961fed6e4a250f5e5532c

SHA256
c73e816a2aa5841c53e1ace023a75045ef8dfd5b26cc2fda2baa824dbe9f0ea3

SHA512
9358c8165a13fe8fbe22e151fcd5a3d4a20f1a68cf2f11c6d015808f3d95acd122599d46e7aab47614134c850fba7900bc1bcc5ded8dc10e237f8d1004ed3fc9

Download Submit
memory/1196-40-0x0000000000190000-0x00000000001A8000-memory.dmp

Filesize
96KB

Download
memory/3244-12-0x00007FFA473E3000-0x00007FFA473E5000-memory.dmp

Filesize
8KB

Download
memory/3244-13-0x0000000000E00000-0x0000000000E44000-memory.dmp

Filesize
272KB

Download
memory/3760-52-0x0000017440E20000-0x0000017440E42000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads