xworm | 2c99b1f642afde5a77d480ce56dd3f9c3e3d248004557fde144f28d75cc96595

Analysis

max time kernel
148s
max time network
149s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
26/01/2025, 13:45

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General

Target

vaJBMLa9PX3g4P8.exe
Size

86KB
MD5

52b32b4d4e7f2b918eceda96cb755e41
SHA1

efc17704ec1e32f4228c7ba030b70ba2b5113837
SHA256

2c99b1f642afde5a77d480ce56dd3f9c3e3d248004557fde144f28d75cc96595
SHA512

8ebc502e2a6ddd5d050bc7c5350ec51f07576c2c6a31b5f82b87c3e3d979ff3ba090006eeb0a8dbc531bc66ea8968152af8e40cb938790124b8bb39ae2b39cc4
SSDEEP

1536:e38SRAo+1qDQHBoJBng+foNW2hLUAjYeHEqIALZiAg4b8jBTjD:e38SRR+oiong+ANWUz+HAg4glTf

Score

10^/10

xworm discovery execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%AppData%
install_file
Steam.exe

Signatures

Detect Xworm Payload 5 IoCs

resource	yara_rule
behavioral1/memory/2056-11-0x0000000000400000-0x0000000000418000-memory.dmp	family_xworm
behavioral1/memory/2056-8-0x0000000000400000-0x0000000000418000-memory.dmp	family_xworm
behavioral1/memory/2056-6-0x0000000000400000-0x0000000000418000-memory.dmp	family_xworm
behavioral1/memory/2056-15-0x0000000000400000-0x0000000000418000-memory.dmp	family_xworm
behavioral1/memory/2056-13-0x0000000000400000-0x0000000000418000-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 4 IoCs

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

execution

PowerShell

T1059.001

pid	Process
2820	powershell.exe
2708	powershell.exe
2212	powershell.exe
2448	powershell.exe

Executes dropped EXE 2 IoCs

pid	Process
2868	Steam.exe
2936	Steam.exe

Uses the VBS compiler for execution 1 TTPs

Command and Scripting Interpreter
T1059

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2703099537-420551529-3771253338-1000\Software\Microsoft\Windows\CurrentVersion\Run\666999666 = "C:\\Users\\Admin\\AppData\\Local\\vaJBMLa9PX3g4P8.exe"	vaJBMLa9PX3g4P8.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2703099537-420551529-3771253338-1000\Software\Microsoft\Windows\CurrentVersion\Run\Steam = "C:\\Users\\Admin\\AppData\\Roaming\\Steam.exe"	vbc.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 39 IoCs

Web Service

T1102

flow	ioc
11	raw.githubusercontent.com
18	raw.githubusercontent.com
24	raw.githubusercontent.com
28	raw.githubusercontent.com
4	raw.githubusercontent.com
35	raw.githubusercontent.com
26	raw.githubusercontent.com
16	raw.githubusercontent.com
23	raw.githubusercontent.com
36	raw.githubusercontent.com
10	raw.githubusercontent.com
44	raw.githubusercontent.com
19	raw.githubusercontent.com
21	raw.githubusercontent.com
39	raw.githubusercontent.com
43	raw.githubusercontent.com
14	raw.githubusercontent.com
12	raw.githubusercontent.com
13	raw.githubusercontent.com
15	raw.githubusercontent.com
20	raw.githubusercontent.com
25	raw.githubusercontent.com
31	raw.githubusercontent.com
33	raw.githubusercontent.com
8	raw.githubusercontent.com
42	raw.githubusercontent.com
40	raw.githubusercontent.com
9	raw.githubusercontent.com
17	raw.githubusercontent.com
29	raw.githubusercontent.com
38	raw.githubusercontent.com
5	raw.githubusercontent.com
27	raw.githubusercontent.com
30	raw.githubusercontent.com
32	raw.githubusercontent.com
34	raw.githubusercontent.com
37	raw.githubusercontent.com
41	raw.githubusercontent.com
22	raw.githubusercontent.com

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2420 set thread context of 2056	2420	vaJBMLa9PX3g4P8.exe	29

System Location Discovery: System Language Discovery 1 TTPs 11 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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Steam.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Steam.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vaJBMLa9PX3g4P8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
2768	timeout.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
372	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2820	powershell.exe
2708	powershell.exe
2212	powershell.exe
2448	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	2420	vaJBMLa9PX3g4P8.exe
Token: SeDebugPrivilege	2056	vbc.exe
Token: SeDebugPrivilege	2820	powershell.exe
Token: SeDebugPrivilege	2708	powershell.exe
Token: SeDebugPrivilege	2212	powershell.exe
Token: SeDebugPrivilege	2448	powershell.exe

Suspicious use of WriteProcessMemory 45 IoCs

description	pid	Process	procid_target
PID 2420 wrote to memory of 2056	2420	vaJBMLa9PX3g4P8.exe	29
PID 2420 wrote to memory of 2056	2420	vaJBMLa9PX3g4P8.exe	29
PID 2420 wrote to memory of 2056	2420	vaJBMLa9PX3g4P8.exe	29
PID 2420 wrote to memory of 2056	2420	vaJBMLa9PX3g4P8.exe	29
PID 2420 wrote to memory of 2056	2420	vaJBMLa9PX3g4P8.exe	29
PID 2420 wrote to memory of 2056	2420	vaJBMLa9PX3g4P8.exe	29
PID 2420 wrote to memory of 2056	2420	vaJBMLa9PX3g4P8.exe	29
PID 2420 wrote to memory of 2056	2420	vaJBMLa9PX3g4P8.exe	29
PID 2420 wrote to memory of 2056	2420	vaJBMLa9PX3g4P8.exe	29
PID 2420 wrote to memory of 2912	2420	vaJBMLa9PX3g4P8.exe	30
PID 2420 wrote to memory of 2912	2420	vaJBMLa9PX3g4P8.exe	30
PID 2420 wrote to memory of 2912	2420	vaJBMLa9PX3g4P8.exe	30
PID 2420 wrote to memory of 2912	2420	vaJBMLa9PX3g4P8.exe	30
PID 2912 wrote to memory of 2768	2912	cmd.exe	32
PID 2912 wrote to memory of 2768	2912	cmd.exe	32
PID 2912 wrote to memory of 2768	2912	cmd.exe	32
PID 2912 wrote to memory of 2768	2912	cmd.exe	32
PID 2056 wrote to memory of 2820	2056	vbc.exe	33
PID 2056 wrote to memory of 2820	2056	vbc.exe	33
PID 2056 wrote to memory of 2820	2056	vbc.exe	33
PID 2056 wrote to memory of 2820	2056	vbc.exe	33
PID 2056 wrote to memory of 2708	2056	vbc.exe	35
PID 2056 wrote to memory of 2708	2056	vbc.exe	35
PID 2056 wrote to memory of 2708	2056	vbc.exe	35
PID 2056 wrote to memory of 2708	2056	vbc.exe	35
PID 2056 wrote to memory of 2212	2056	vbc.exe	37
PID 2056 wrote to memory of 2212	2056	vbc.exe	37
PID 2056 wrote to memory of 2212	2056	vbc.exe	37
PID 2056 wrote to memory of 2212	2056	vbc.exe	37
PID 2056 wrote to memory of 2448	2056	vbc.exe	39
PID 2056 wrote to memory of 2448	2056	vbc.exe	39
PID 2056 wrote to memory of 2448	2056	vbc.exe	39
PID 2056 wrote to memory of 2448	2056	vbc.exe	39
PID 2056 wrote to memory of 372	2056	vbc.exe	41
PID 2056 wrote to memory of 372	2056	vbc.exe	41
PID 2056 wrote to memory of 372	2056	vbc.exe	41
PID 2056 wrote to memory of 372	2056	vbc.exe	41
PID 2788 wrote to memory of 2868	2788	taskeng.exe	44
PID 2788 wrote to memory of 2868	2788	taskeng.exe	44
PID 2788 wrote to memory of 2868	2788	taskeng.exe	44
PID 2788 wrote to memory of 2868	2788	taskeng.exe	44
PID 2788 wrote to memory of 2936	2788	taskeng.exe	46
PID 2788 wrote to memory of 2936	2788	taskeng.exe	46
PID 2788 wrote to memory of 2936	2788	taskeng.exe	46
PID 2788 wrote to memory of 2936	2788	taskeng.exe	46

C:\Users\Admin\AppData\Local\Temp\vaJBMLa9PX3g4P8.exe
"C:\Users\Admin\AppData\Local\Temp\vaJBMLa9PX3g4P8.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2420
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe"
  2⤵
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2056
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2820
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'vbc.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2708
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\Steam.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2212
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Steam.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2448
- - C:\Windows\SysWOW64\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Steam" /tr "C:\Users\Admin\AppData\Roaming\Steam.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:372
- C:\Windows\SysWOW64\cmd.exe
  "cmd" /c timeout /t 1 && DEL /f vaJBMLa9PX3g4P8.exe
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2912
- - C:\Windows\SysWOW64\timeout.exe
    timeout /t 1
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2768

C:\Windows\system32\taskeng.exe
taskeng.exe {D1A5F96A-15F8-4C33-ACDD-C6F1C85921D7} S-1-5-21-2703099537-420551529-3771253338-1000:XECUDNCD\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2788
- C:\Users\Admin\AppData\Roaming\Steam.exe
  C:\Users\Admin\AppData\Roaming\Steam.exe
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:2868
- C:\Users\Admin\AppData\Roaming\Steam.exe
  C:\Users\Admin\AppData\Roaming\Steam.exe
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:2936

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\Cab50C1.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tar50D4.tmp

Filesize
181KB

MD5
4ea6026cf93ec6338144661bf1202cd1

SHA1
a1dec9044f750ad887935a01430bf49322fbdcb7

SHA256
8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

SHA512
6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\d93f411851d7c929.customDestinations-ms

Filesize
7KB

MD5
812663f507f7a02dc0d3a1bb810eb5df

SHA1
f9f19ab1ee3d6ff75b5e6265518ffa1255eae50b

SHA256
8b4eb44ef3d6c72facaff5ea4c15e20d82f50cc42e965cc52700b5b55bdaa21e

SHA512
ec2c39d2edc021269ef1537e5f75d1e8f6359731502755d711d1fb6c943986a578b0305facb6b8c69582c0c3dea5a10ad18ac7de2ce287e389ec6caaaeec23a6

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

Filesize
2.6MB

MD5
1f7bccc57d21a4bfeddaafe514cfd74d

SHA1
4dab09179a12468cb1757cb7ca26e06d616b0a8d

SHA256
d4cb7377e8275ed47e499ab0d7ee47167829a5931ba41aa5790593595a7e1061

SHA512
9e639c777dc2d456f038c14efb7cbc871ceb1d7380a74d18fb722a28901357ccb1166c0d883562280e030f0252004ca13a1371ea480d0523c435cd0a6d9f43d8

Download Submit
memory/2056-15-0x0000000000400000-0x0000000000418000-memory.dmp

Filesize
96KB

Download
memory/2056-11-0x0000000000400000-0x0000000000418000-memory.dmp

Filesize
96KB

Download
memory/2056-6-0x0000000000400000-0x0000000000418000-memory.dmp

Filesize
96KB

Download
memory/2056-5-0x0000000000400000-0x0000000000418000-memory.dmp

Filesize
96KB

Download
memory/2056-4-0x0000000000400000-0x0000000000418000-memory.dmp

Filesize
96KB

Download
memory/2056-199-0x00000000740C0000-0x00000000747AE000-memory.dmp

Filesize
6.9MB

Download
memory/2056-8-0x0000000000400000-0x0000000000418000-memory.dmp

Filesize
96KB

Download
memory/2056-17-0x00000000740C0000-0x00000000747AE000-memory.dmp

Filesize
6.9MB

Download
memory/2056-13-0x0000000000400000-0x0000000000418000-memory.dmp

Filesize
96KB

Download
memory/2056-10-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

Filesize
4KB

Download
memory/2056-36-0x00000000740C0000-0x00000000747AE000-memory.dmp

Filesize
6.9MB

Download
memory/2056-45-0x00000000740C0000-0x00000000747AE000-memory.dmp

Filesize
6.9MB

Download
memory/2420-37-0x00000000740C0000-0x00000000747AE000-memory.dmp

Filesize
6.9MB

Download
memory/2420-0-0x00000000740CE000-0x00000000740CF000-memory.dmp

Filesize
4KB

Download
memory/2420-2-0x0000000000570000-0x000000000058A000-memory.dmp

Filesize
104KB

Download
memory/2420-16-0x00000000740C0000-0x00000000747AE000-memory.dmp

Filesize
6.9MB

Download
memory/2420-1-0x0000000000F30000-0x0000000000F4C000-memory.dmp

Filesize
112KB

Download