xworm | e1ea405efb08d4a7d254423fc5b700021eb653b1545d120c0f6cf4ff31c7f0ae

Resubmissions

02/05/2024, 02:55

240502-defjmshb4210

02/05/2024, 02:37

240502-c35m1agg8910

Analysis

max time kernel
274s
max time network
300s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
02/05/2024, 02:37

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General

Target
a ton of ya/ya.exe
Size 63KB
Sample240502-c35m1agg89
SHA256 ff43049677c57277f12a1d97f02af3029d7b75b5ad40303a28f1b0452997969d
MD5 222c2d239f4c8a1d73c736c9cc712807
SHA1 c3aa61bd6f8cc640bcfa74c40d9283c9c08c7b3c
SHA512 1f2fea85e45e93916306c234b916d6b4b200dac9656e44f4555f825dd8677cb5e927bd5e7a74bf2fb2f6972a3e6e2d294a6104add162ba3d53a0e6cfedef6a02
SSDEEP 1536:tJc/5q1qoR5PDdAZcIED4VuCkbFybjQ9f0jQRmONww+W:7c/iqoJekbFEQ9W+mONP+W
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

127.0.0.1:23638
209.25.140.1:5525:23638
bring-recorder.gl.at.ply.gg:23638
action-yesterday.gl.at.ply.gg:23638
147.185.221.19:23638
then-wheel.gl.at.ply.gg::23638
then-wheel.gl.at.ply.gg:23638
teen-modes.gl.at.ply.gg:23638

Attributes

Install_directory
%LocalAppData%
install_file
uwumonster.exe

Signatures

Contains code to disable Windows Defender 1 IoCs

A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

resource	yara_rule
behavioral32/memory/1396-22-0x0000000000C70000-0x0000000000C7E000-memory.dmp	disable_win_def

Detect Xworm Payload 7 IoCs

resource	yara_rule
behavioral32/memory/1396-1-0x0000000001050000-0x0000000001066000-memory.dmp	family_xworm
behavioral32/files/0x000c000000013187-8.dat	family_xworm
behavioral32/memory/2948-10-0x0000000000260000-0x0000000000276000-memory.dmp	family_xworm
behavioral32/memory/1996-15-0x0000000001190000-0x00000000011A6000-memory.dmp	family_xworm
behavioral32/memory/2148-17-0x0000000000020000-0x0000000000036000-memory.dmp	family_xworm
behavioral32/memory/1784-19-0x00000000009A0000-0x00000000009B6000-memory.dmp	family_xworm
behavioral32/memory/2356-21-0x0000000000360000-0x0000000000376000-memory.dmp	family_xworm

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

Drops startup file 2 IoCs

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

Executes dropped EXE 5 IoCs

pid	Process
2948	uwumonster.exe
1996	uwumonster.exe
2148	uwumonster.exe
1784	uwumonster.exe
2356	uwumonster.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-1-5-21-3452737119-3959686427-228443150-1000\Software\Microsoft\Windows\CurrentVersion\Run\uwumonster = "C:\\Users\\Admin\\AppData\\Local\\uwumonster.exe"	ya.exe

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
2076	schtasks.exe

Suspicious use of AdjustPrivilegeToken 10 IoCs

description	pid	Process
Token: SeDebugPrivilege	1396	ya.exe
Token: SeDebugPrivilege	1396	ya.exe
Token: SeDebugPrivilege	2948	uwumonster.exe
Token: SeDebugPrivilege	1996	uwumonster.exe
Token: SeDebugPrivilege	2148	uwumonster.exe
Token: SeDebugPrivilege	1784	uwumonster.exe
Token: SeDebugPrivilege	2356	uwumonster.exe
Token: SeBackupPrivilege	2628	vssvc.exe
Token: SeRestorePrivilege	2628	vssvc.exe
Token: SeAuditPrivilege	2628	vssvc.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 1396 wrote to memory of 2076	1396	ya.exe	28
PID 1396 wrote to memory of 2076	1396	ya.exe	28
PID 1396 wrote to memory of 2076	1396	ya.exe	28
PID 2492 wrote to memory of 2948	2492	taskeng.exe	32
PID 2492 wrote to memory of 2948	2492	taskeng.exe	32
PID 2492 wrote to memory of 2948	2492	taskeng.exe	32
PID 2492 wrote to memory of 1996	2492	taskeng.exe	35
PID 2492 wrote to memory of 1996	2492	taskeng.exe	35
PID 2492 wrote to memory of 1996	2492	taskeng.exe	35
PID 2492 wrote to memory of 2148	2492	taskeng.exe	36
PID 2492 wrote to memory of 2148	2492	taskeng.exe	36
PID 2492 wrote to memory of 2148	2492	taskeng.exe	36
PID 2492 wrote to memory of 1784	2492	taskeng.exe	37
PID 2492 wrote to memory of 1784	2492	taskeng.exe	37
PID 2492 wrote to memory of 1784	2492	taskeng.exe	37
PID 2492 wrote to memory of 2356	2492	taskeng.exe	38
PID 2492 wrote to memory of 2356	2492	taskeng.exe	38
PID 2492 wrote to memory of 2356	2492	taskeng.exe	38

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
Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware

C:\Users\Admin\AppData\Local\Temp\a ton of ya\ya.exe
"C:\Users\Admin\AppData\Local\Temp\a ton of ya\ya.exe"
1⤵
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1396
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "uwumonster" /tr "C:\Users\Admin\AppData\Local\uwumonster.exe"
  2⤵
  - Creates scheduled task(s)
  PID:2076

C:\Windows\system32\taskeng.exe
taskeng.exe {4CB50F81-E671-4E80-A15F-B71450A32314} S-1-5-21-3452737119-3959686427-228443150-1000:QGTQZTRE\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2492
- C:\Users\Admin\AppData\Local\uwumonster.exe
  C:\Users\Admin\AppData\Local\uwumonster.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2948
- C:\Users\Admin\AppData\Local\uwumonster.exe
  C:\Users\Admin\AppData\Local\uwumonster.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1996
- C:\Users\Admin\AppData\Local\uwumonster.exe
  C:\Users\Admin\AppData\Local\uwumonster.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2148
- C:\Users\Admin\AppData\Local\uwumonster.exe
  C:\Users\Admin\AppData\Local\uwumonster.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1784
- C:\Users\Admin\AppData\Local\uwumonster.exe
  C:\Users\Admin\AppData\Local\uwumonster.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2356

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2628

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

uwumonster.exe

Path C:\Users\Admin\AppData\Local\uwumonster.exe
Size 63KB
SHA256 ff43049677c57277f12a1d97f02af3029d7b75b5ad40303a28f1b0452997969d
MD5 222c2d239f4c8a1d73c736c9cc712807
SHA1 c3aa61bd6f8cc640bcfa74c40d9283c9c08c7b3c
SHA512 1f2fea85e45e93916306c234b916d6b4b200dac9656e44f4555f825dd8677cb5e927bd5e7a74bf2fb2f6972a3e6e2d294a6104add162ba3d53a0e6cfedef6a02
SSDEEP 1536:tJc/5q1qoR5PDdAZcIED4VuCkbFybjQ9f0jQRmONww+W:7c/iqoJekbFEQ9W+mONP+W
MD5 SHA1 SHA512 SSDEEP

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memory/1396-0-0x000007FEF57C3000-0x000007FEF57C4000-memory.dmp

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memory/1396-1-0x0000000001050000-0x0000000001066000-memory.dmp

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memory/1396-6-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

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memory/1396-11-0x000007FEF57C3000-0x000007FEF57C4000-memory.dmp

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memory/1396-12-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

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memory/1396-22-0x0000000000C70000-0x0000000000C7E000-memory.dmp

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memory/1784-19-0x00000000009A0000-0x00000000009B6000-memory.dmp

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memory/1996-15-0x0000000001190000-0x00000000011A6000-memory.dmp

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memory/2148-17-0x0000000000020000-0x0000000000036000-memory.dmp

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memory/2356-21-0x0000000000360000-0x0000000000376000-memory.dmp

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memory/2948-10-0x0000000000260000-0x0000000000276000-memory.dmp

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Resubmissions

Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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