xworm | b52c318fa8920d155d54fe5c691a4439a65a017dc66debf5439ca8ff8bcd9b79

General

Target

exerat.exe
Size

144KB
MD5

2e8e927794b0c56324233077c43e3167
SHA1

0cb2f30a977e83c3ce6275673c718ae20ec32337
SHA256

b52c318fa8920d155d54fe5c691a4439a65a017dc66debf5439ca8ff8bcd9b79
SHA512

a4df86e1f16bb5f94f850e14be647ba5119170ac36e616a20bceab6d230d6f6de6049fabaa416434611542b466306203a71ec36817b66e1af857185a1b5654c2
SSDEEP

3072:QYfiiyfb9mNOgQBQFF2RYtMgK+Wl9HhDhIpfeZQKGtoFLjMD:lSbPCjthy9H9h4mZQKen

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

147.185.221.21:37029

Attributes

Install_directory
%AppData%
install_file
Steam Client Service.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/2636-1-0x0000000000DB0000-0x0000000000DDA000-memory.dmp	family_xworm
behavioral2/files/0x000800000001d8ac-59.dat	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
844	powershell.exe
2700	powershell.exe
3676	powershell.exe
3656	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-1-5-21-2718105630-359604950-2820636825-1000\Control Panel\International\Geo\Nation	exerat.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 2 IoCs

pid	Process
3392	Steam Client Service.exe
4268	Steam Client Service.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-1-5-21-2718105630-359604950-2820636825-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Steam Client Service = "C:\\Users\\Admin\\AppData\\Roaming\\Steam Client Service.exe"	exerat.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
19	ip-api.com

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

System Information Discovery
T1082

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
3468	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
3656	powershell.exe
3656	powershell.exe
844	powershell.exe
844	powershell.exe
2700	powershell.exe
2700	powershell.exe
3676	powershell.exe
3676	powershell.exe
2636	exerat.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	2636	exerat.exe
Token: SeDebugPrivilege	3656	powershell.exe
Token: SeDebugPrivilege	844	powershell.exe
Token: SeDebugPrivilege	2700	powershell.exe
Token: SeDebugPrivilege	3676	powershell.exe
Token: SeDebugPrivilege	2636	exerat.exe
Token: SeDebugPrivilege	3392	Steam Client Service.exe
Token: SeDebugPrivilege	4268	Steam Client Service.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2636	exerat.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2636 wrote to memory of 3656	2636	exerat.exe	93
PID 2636 wrote to memory of 3656	2636	exerat.exe	93
PID 2636 wrote to memory of 844	2636	exerat.exe	96
PID 2636 wrote to memory of 844	2636	exerat.exe	96
PID 2636 wrote to memory of 2700	2636	exerat.exe	98
PID 2636 wrote to memory of 2700	2636	exerat.exe	98
PID 2636 wrote to memory of 3676	2636	exerat.exe	100
PID 2636 wrote to memory of 3676	2636	exerat.exe	100
PID 2636 wrote to memory of 3468	2636	exerat.exe	103
PID 2636 wrote to memory of 3468	2636	exerat.exe	103

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\exerat.exe
"C:\Users\Admin\AppData\Local\Temp\exerat.exe"
1⤵
- Checks computer location settings
- 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:2636
- 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\exerat.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3656
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'exerat.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:844
- 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\Steam Client Service.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2700
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Steam Client Service.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3676
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Steam Client Service" /tr "C:\Users\Admin\AppData\Roaming\Steam Client Service.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3468

C:\Users\Admin\AppData\Roaming\Steam Client Service.exe
"C:\Users\Admin\AppData\Roaming\Steam Client Service.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3392

C:\Users\Admin\AppData\Roaming\Steam Client Service.exe
"C:\Users\Admin\AppData\Roaming\Steam Client Service.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4268

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

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Steam Client Service.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
cadef9abd087803c630df65264a6c81c

SHA1
babbf3636c347c8727c35f3eef2ee643dbcc4bd2

SHA256
cce65b73cdfe9304bcd5207913e8b60fb69faa20cd3b684f2b0343b755b99438

SHA512
7278aa87124abb382d9024a645e881e7b7cf1b84e8894943b36e018dbf0399e6858392f77980b599fa5488e2e21bf757a0702fe6419417edac93b68e0c2ec085

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

Filesize
944B

MD5
73af4f2170e957d2e0a17b3969478aae

SHA1
0cf6ed9f94648debd2f23f4b4563a07a4d8ab8b5

SHA256
b157a020262f6ab70c58265ad703ab2ed3db6baff07a471519c8d3b682c5f329

SHA512
56d2da128397e463ed742cfc06f0e8e20bd87d439b3e164dde82da163195ac55e3fa532a427de5f3546878e2bb5532f588ea84790ca3a0e3c5cf6b242ea8572d

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

Filesize
944B

MD5
08aa6129843369c07175e939425eef42

SHA1
87d092fbc484fe9bc6461be0b278d0e466cabae6

SHA256
662d88516181738694e7eab9b95f2ce0c3f322f93de18412375d00cc1c1922b1

SHA512
f2990c76c0b46ae250adc2ac9f27dbc3009263787d1c3e91431cff41b7219d6a2aaf31484eec92448b3d5bc93c0b8ffd9dd7f48dc136be08287adc752c4e1a35

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ecil0ai4.0rh.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\Steam Client Service.exe

Filesize
144KB

MD5
2e8e927794b0c56324233077c43e3167

SHA1
0cb2f30a977e83c3ce6275673c718ae20ec32337

SHA256
b52c318fa8920d155d54fe5c691a4439a65a017dc66debf5439ca8ff8bcd9b79

SHA512
a4df86e1f16bb5f94f850e14be647ba5119170ac36e616a20bceab6d230d6f6de6049fabaa416434611542b466306203a71ec36817b66e1af857185a1b5654c2

Download Submit
memory/2636-1-0x0000000000DB0000-0x0000000000DDA000-memory.dmp

Filesize
168KB

Download
memory/2636-2-0x00007FFBC6D00000-0x00007FFBC77C1000-memory.dmp

Filesize
10.8MB

Download
memory/2636-0-0x00007FFBC6D03000-0x00007FFBC6D05000-memory.dmp

Filesize
8KB

Download
memory/2636-58-0x00007FFBC6D00000-0x00007FFBC77C1000-memory.dmp

Filesize
10.8MB

Download
memory/2636-53-0x00007FFBC6D03000-0x00007FFBC6D05000-memory.dmp

Filesize
8KB

Download
memory/3656-14-0x00007FFBC6D00000-0x00007FFBC77C1000-memory.dmp

Filesize
10.8MB

Download
memory/3656-18-0x00007FFBC6D00000-0x00007FFBC77C1000-memory.dmp

Filesize
10.8MB

Download
memory/3656-15-0x00007FFBC6D00000-0x00007FFBC77C1000-memory.dmp

Filesize
10.8MB

Download
memory/3656-9-0x0000020483920000-0x0000020483942000-memory.dmp

Filesize
136KB

Download
memory/3656-3-0x00007FFBC6D00000-0x00007FFBC77C1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads