xworm | d4d38f87de58a5245ab1a01a7e28df51f69e890ab05ebc67ede60bf59221c721

General

Target

Nursultan/Nurik.exe
Size

93.0MB
MD5

a7af4ea5482967126191e729140dfd4c
SHA1

dbff744bbc2f7adfbe337f3fd700c50433301b2d
SHA256

5cac4982836ceae3b8de591f5f469234c5e75dd5c90757279015ddd6b73251d6
SHA512

4734bde77c6fe490589aeb7ac142fa293b59b09cda0226bc22b2c8928c2d4cd1ef47cab95d88a7618c9dd76fe482a346bd6dd2186dea7610e5697c3b46c32156
SSDEEP

1536:OfeHtRfrimdNmkKZr311OGAiQj39IdcCqcAPh9KE:nHtRp6r311RAzj390VAPh9v

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

127.0.0.1:38492

warning-ms.gl.at.ply.gg:38492

Attributes

Install_directory
%AppData%
install_file
XClient.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/files/0x0009000000023c7f-24.dat	family_xworm
behavioral2/memory/2188-31-0x0000000000990000-0x00000000009AC000-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 5 IoCs

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

execution

PowerShell

T1059.001

pid	Process
2056	powershell.exe
4160	powershell.exe
5056	powershell.exe
4520	powershell.exe
4952	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-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	Nurik.exe
Key value queried	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	Nursultan.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 1 IoCs

pid	Process
2188	Nursultan.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-1-5-21-493223053-2004649691-1575712786-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Roaming\\XClient.exe"	Nursultan.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
23	ip-api.com

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
4952	powershell.exe
4952	powershell.exe
2056	powershell.exe
2056	powershell.exe
4160	powershell.exe
4160	powershell.exe
5056	powershell.exe
5056	powershell.exe
4520	powershell.exe
4520	powershell.exe
2188	Nursultan.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	4952	powershell.exe
Token: SeDebugPrivilege	2188	Nursultan.exe
Token: SeDebugPrivilege	2056	powershell.exe
Token: SeDebugPrivilege	4160	powershell.exe
Token: SeDebugPrivilege	5056	powershell.exe
Token: SeDebugPrivilege	4520	powershell.exe
Token: SeDebugPrivilege	2188	Nursultan.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2188	Nursultan.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1484 wrote to memory of 4952	1484	Nurik.exe	100
PID 1484 wrote to memory of 4952	1484	Nurik.exe	100
PID 1484 wrote to memory of 2188	1484	Nurik.exe	102
PID 1484 wrote to memory of 2188	1484	Nurik.exe	102
PID 2188 wrote to memory of 2056	2188	Nursultan.exe	104
PID 2188 wrote to memory of 2056	2188	Nursultan.exe	104
PID 2188 wrote to memory of 4160	2188	Nursultan.exe	106
PID 2188 wrote to memory of 4160	2188	Nursultan.exe	106
PID 2188 wrote to memory of 5056	2188	Nursultan.exe	108
PID 2188 wrote to memory of 5056	2188	Nursultan.exe	108
PID 2188 wrote to memory of 4520	2188	Nursultan.exe	110
PID 2188 wrote to memory of 4520	2188	Nursultan.exe	110

C:\Users\Admin\AppData\Local\Temp\Nursultan\Nurik.exe
"C:\Users\Admin\AppData\Local\Temp\Nursultan\Nurik.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1484
- 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\Nursultan.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4952
- C:\Users\Admin\AppData\Local\Temp\Nursultan.exe
  "C:\Users\Admin\AppData\Local\Temp\Nursultan.exe"
  2⤵
  - Checks computer location settings
  - Drops startup file
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2188
- - 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\Nursultan.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2056
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Nursultan.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4160
- - 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'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:5056
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4520

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

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\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
77d622bb1a5b250869a3238b9bc1402b

SHA1
d47f4003c2554b9dfc4c16f22460b331886b191b

SHA256
f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb

SHA512
d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

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

Filesize
944B

MD5
6d14ccefeb263594e60b1765e131f7a3

SHA1
4a9ebdc0dff58645406c40b7b140e1b174756721

SHA256
57cd435c8b2bf10a2c77698301789c032e1b6b623ff1420c72e8bca0b10f1e5c

SHA512
2013a26123f72a4106524fd9d7389ac4654f97033d22707efc084fb2a3ad01c298eb64f01bb64861ab603615022dbe7cfc97475346edb16b3ba72e905127f101

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

Filesize
944B

MD5
7a451cd1316d70a65910773fee8c3a43

SHA1
d2db32d5037153dd1d94565b51b5b385817a3c3d

SHA256
862d25ed22075f3d1f5e8d29a3c6e050dc91e53a4dc653c3f0f7c627a12ee26c

SHA512
60887f795036fbd6d25234c17dab4463a8a02f576ae8c07dd7b4c4ff1dba35f99b7301139ea051a7a80fdfc9e003a2f0c2dd0d444a82ecf87a3df21507332aa6

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

Filesize
944B

MD5
10fb30dc297f99d6ebafa5fee8b24fa2

SHA1
76904509313a49a765edcde26b69c3a61f9fa225

SHA256
567bcacac120711fc04bf8e6c8cd0bff7b61e8ee0a6316254d1005ebb1264e6a

SHA512
c42ace1ea0923fa55592f4f486a508ea56997fdbe0200016b0fc16a33452fc28e4530129a315b3b3a5ede37a07097c13a0eb310c9e91e5d97bb7ce7b955b9498

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

Filesize
87KB

MD5
38fc92faaaa97884e49674a2fb59dffa

SHA1
d2fdfcd6a426e4a0eb3dfc3b1c0d09ea0db945a2

SHA256
26d868f392303276bb62ce6771ec4bae63add8874e2621549d447490112ba992

SHA512
b8d4a64a9e02e96848d9285b3a6e7986cf4c54a520f75354008815790d7001361b3e570d9ff1c2d5e747ee1943b6bee791012120b536b06edb534aa76c445777

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_f2hwjulu.uyj.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1484-66-0x00007FFF44D60000-0x00007FFF45821000-memory.dmp

Filesize
10.8MB

Download
memory/1484-0-0x00007FFF44D63000-0x00007FFF44D65000-memory.dmp

Filesize
8KB

Download
memory/1484-2-0x00007FFF44D63000-0x00007FFF44D65000-memory.dmp

Filesize
8KB

Download
memory/1484-28-0x00007FFF44D60000-0x00007FFF45821000-memory.dmp

Filesize
10.8MB

Download
memory/1484-1-0x0000000000460000-0x0000000000474000-memory.dmp

Filesize
80KB

Download
memory/2188-31-0x0000000000990000-0x00000000009AC000-memory.dmp

Filesize
112KB

Download
memory/4952-8-0x0000023B34710000-0x0000023B34732000-memory.dmp

Filesize
136KB

Download
memory/4952-18-0x00007FFF44D60000-0x00007FFF45821000-memory.dmp

Filesize
10.8MB

Download
memory/4952-15-0x00007FFF44D60000-0x00007FFF45821000-memory.dmp

Filesize
10.8MB

Download
memory/4952-14-0x00007FFF44D60000-0x00007FFF45821000-memory.dmp

Filesize
10.8MB

Download
memory/4952-13-0x00007FFF44D60000-0x00007FFF45821000-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