umbral | 20868115f180702553380c551df502535b8aa01c3ef630d408edd849896e631a

Analysis

max time kernel
133s
max time network
138s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
25-09-2024 07:25

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General

Target

RustAnticheat.exe
Size

1.1MB
MD5

0d0d79a916d356823c4742f3253aa6aa
SHA1

5e267d313557b5dbf6c216e79190b20fb5ab8177
SHA256

20868115f180702553380c551df502535b8aa01c3ef630d408edd849896e631a
SHA512

9bbc72f3b647885dee27a27f5e30e2c845f5eb395bcf545ba7c75d65a0386f9c97dab4348a946fd693a90f4994550fda41a0528072cfeb8106ab603232573365
SSDEEP

24576:drAsHOi4ltSzmSEPGUSa/D3mIaCmo/NE1a1pvRQrhWgJbavyRAh79c0ih:5Lu1tSzmhR/nCo/K0pZQrE2RAh79Lih

Score

10^/10

umbral xworm discovery execution persistence rat stealer trojan

Malware Config

Extracted

Family

xworm

web-amend.gl.at.ply.gg:59501

Attributes

Install_directory
%Userprofile%
install_file
USB.exe

Extracted

Family

umbral

https://discord.com/api/webhooks/1288399761308782603/dBc32ufL91AjkI32Qso8IT_vaA0Frj3MP9_ivfjpfIEs4tXDc5SB89aA7LHc09xTZHZv

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral2/files/0x000800000001ac0e-17.dat	family_umbral
behavioral2/memory/3560-18-0x0000014B88B40000-0x0000014B88B80000-memory.dmp	family_umbral

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/files/0x000800000001ac0b-11.dat	family_xworm
behavioral2/memory/1280-19-0x00000000008C0000-0x00000000008DA000-memory.dmp	family_xworm

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral
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
1396	powershell.exe
1768	powershell.exe
316	powershell.exe
2300	powershell.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 5 IoCs

pid	Process
2472	Loader (1).exe
1280	RuntimeBroker.exe
3560	Litvin.exe
3376	RuntimeBroker
4960	RuntimeBroker

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-1-5-21-4106386276-4127174233-3637007343-1000\Software\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "C:\\Users\\Admin\\RuntimeBroker"	RuntimeBroker.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 1 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	Loader (1).exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2580	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
1720	schtasks.exe

Suspicious behavior: EnumeratesProcesses 13 IoCs

pid	Process
1396	powershell.exe
1396	powershell.exe
1396	powershell.exe
1768	powershell.exe
1768	powershell.exe
1768	powershell.exe
316	powershell.exe
316	powershell.exe
316	powershell.exe
2300	powershell.exe
2300	powershell.exe
2300	powershell.exe
1280	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	1280	RuntimeBroker.exe
Token: SeDebugPrivilege	3560	Litvin.exe
Token: SeIncreaseQuotaPrivilege	5012	wmic.exe
Token: SeSecurityPrivilege	5012	wmic.exe
Token: SeTakeOwnershipPrivilege	5012	wmic.exe
Token: SeLoadDriverPrivilege	5012	wmic.exe
Token: SeSystemProfilePrivilege	5012	wmic.exe
Token: SeSystemtimePrivilege	5012	wmic.exe
Token: SeProfSingleProcessPrivilege	5012	wmic.exe
Token: SeIncBasePriorityPrivilege	5012	wmic.exe
Token: SeCreatePagefilePrivilege	5012	wmic.exe
Token: SeBackupPrivilege	5012	wmic.exe
Token: SeRestorePrivilege	5012	wmic.exe
Token: SeShutdownPrivilege	5012	wmic.exe
Token: SeDebugPrivilege	5012	wmic.exe
Token: SeSystemEnvironmentPrivilege	5012	wmic.exe
Token: SeRemoteShutdownPrivilege	5012	wmic.exe
Token: SeUndockPrivilege	5012	wmic.exe
Token: SeManageVolumePrivilege	5012	wmic.exe
Token: 33	5012	wmic.exe
Token: 34	5012	wmic.exe
Token: 35	5012	wmic.exe
Token: 36	5012	wmic.exe
Token: SeIncreaseQuotaPrivilege	5012	wmic.exe
Token: SeSecurityPrivilege	5012	wmic.exe
Token: SeTakeOwnershipPrivilege	5012	wmic.exe
Token: SeLoadDriverPrivilege	5012	wmic.exe
Token: SeSystemProfilePrivilege	5012	wmic.exe
Token: SeSystemtimePrivilege	5012	wmic.exe
Token: SeProfSingleProcessPrivilege	5012	wmic.exe
Token: SeIncBasePriorityPrivilege	5012	wmic.exe
Token: SeCreatePagefilePrivilege	5012	wmic.exe
Token: SeBackupPrivilege	5012	wmic.exe
Token: SeRestorePrivilege	5012	wmic.exe
Token: SeShutdownPrivilege	5012	wmic.exe
Token: SeDebugPrivilege	5012	wmic.exe
Token: SeSystemEnvironmentPrivilege	5012	wmic.exe
Token: SeRemoteShutdownPrivilege	5012	wmic.exe
Token: SeUndockPrivilege	5012	wmic.exe
Token: SeManageVolumePrivilege	5012	wmic.exe
Token: 33	5012	wmic.exe
Token: 34	5012	wmic.exe
Token: 35	5012	wmic.exe
Token: 36	5012	wmic.exe
Token: SeDebugPrivilege	1396	powershell.exe
Token: SeIncreaseQuotaPrivilege	1396	powershell.exe
Token: SeSecurityPrivilege	1396	powershell.exe
Token: SeTakeOwnershipPrivilege	1396	powershell.exe
Token: SeLoadDriverPrivilege	1396	powershell.exe
Token: SeSystemProfilePrivilege	1396	powershell.exe
Token: SeSystemtimePrivilege	1396	powershell.exe
Token: SeProfSingleProcessPrivilege	1396	powershell.exe
Token: SeIncBasePriorityPrivilege	1396	powershell.exe
Token: SeCreatePagefilePrivilege	1396	powershell.exe
Token: SeBackupPrivilege	1396	powershell.exe
Token: SeRestorePrivilege	1396	powershell.exe
Token: SeShutdownPrivilege	1396	powershell.exe
Token: SeDebugPrivilege	1396	powershell.exe
Token: SeSystemEnvironmentPrivilege	1396	powershell.exe
Token: SeRemoteShutdownPrivilege	1396	powershell.exe
Token: SeUndockPrivilege	1396	powershell.exe
Token: SeManageVolumePrivilege	1396	powershell.exe
Token: 33	1396	powershell.exe
Token: 34	1396	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1280	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 1888 wrote to memory of 2472	1888	RustAnticheat.exe	73
PID 1888 wrote to memory of 2472	1888	RustAnticheat.exe	73
PID 1888 wrote to memory of 2472	1888	RustAnticheat.exe	73
PID 1888 wrote to memory of 1280	1888	RustAnticheat.exe	74
PID 1888 wrote to memory of 1280	1888	RustAnticheat.exe	74
PID 1888 wrote to memory of 3560	1888	RustAnticheat.exe	75
PID 1888 wrote to memory of 3560	1888	RustAnticheat.exe	75
PID 3560 wrote to memory of 5012	3560	Litvin.exe	76
PID 3560 wrote to memory of 5012	3560	Litvin.exe	76
PID 1280 wrote to memory of 1396	1280	RuntimeBroker.exe	80
PID 1280 wrote to memory of 1396	1280	RuntimeBroker.exe	80
PID 1280 wrote to memory of 1768	1280	RuntimeBroker.exe	83
PID 1280 wrote to memory of 1768	1280	RuntimeBroker.exe	83
PID 1280 wrote to memory of 316	1280	RuntimeBroker.exe	85
PID 1280 wrote to memory of 316	1280	RuntimeBroker.exe	85
PID 1280 wrote to memory of 2300	1280	RuntimeBroker.exe	87
PID 1280 wrote to memory of 2300	1280	RuntimeBroker.exe	87
PID 1280 wrote to memory of 1720	1280	RuntimeBroker.exe	89
PID 1280 wrote to memory of 1720	1280	RuntimeBroker.exe	89
PID 1280 wrote to memory of 820	1280	RuntimeBroker.exe	93
PID 1280 wrote to memory of 820	1280	RuntimeBroker.exe	93
PID 1280 wrote to memory of 4188	1280	RuntimeBroker.exe	95
PID 1280 wrote to memory of 4188	1280	RuntimeBroker.exe	95
PID 4188 wrote to memory of 2580	4188	cmd.exe	97
PID 4188 wrote to memory of 2580	4188	cmd.exe	97

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\RustAnticheat.exe
"C:\Users\Admin\AppData\Local\Temp\RustAnticheat.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1888
- C:\Users\Admin\AppData\Roaming\Loader (1).exe
  "C:\Users\Admin\AppData\Roaming\Loader (1).exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:2472
- C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe
  "C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe"
  2⤵
  - 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:1280
- - 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\RuntimeBroker.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1396
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'RuntimeBroker.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    PID:1768
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\RuntimeBroker'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    PID:316
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'RuntimeBroker'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    PID:2300
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "RuntimeBroker" /tr "C:\Users\Admin\RuntimeBroker"
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1720
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /delete /f /tn "RuntimeBroker"
    3⤵
    PID:820
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp3D9C.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4188
  - - C:\Windows\system32\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:2580
- C:\Users\Admin\AppData\Roaming\Litvin.exe
  "C:\Users\Admin\AppData\Roaming\Litvin.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3560
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:5012

C:\Users\Admin\RuntimeBroker
C:\Users\Admin\RuntimeBroker
1⤵
- Executes dropped EXE
PID:3376

C:\Users\Admin\RuntimeBroker
C:\Users\Admin\RuntimeBroker
1⤵
- Executes dropped EXE
PID:4960

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

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
654B

MD5
16c5fce5f7230eea11598ec11ed42862

SHA1
75392d4824706090f5e8907eee1059349c927600

SHA256
87ba77c13905298acbac72be90949c4fe0755b6eff9777615aa37f252515f151

SHA512
153edd6da59beea6cc411ed7383c32916425d6ebb65f04c65aab7c1d6b25443d143aa8449aa92149de0ad8a975f6ecaa60f9f7574536eec6b38fe5fd3a6c6adc

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

Filesize
3KB

MD5
8592ba100a78835a6b94d5949e13dfc1

SHA1
63e901200ab9a57c7dd4c078d7f75dcd3b357020

SHA256
fdd7d9def6f9f0c0f2e60dbc8a2d1999071cd7d3095e9e087bb1cda7a614ac3c

SHA512
87f98e6cb61b2a2a7d65710c4d33881d89715eb7a06e00d492259f35c3902498baabffc5886be0ec5a14312ad4c262e3fc40cd3a5cb91701af0fb229726b88c3

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

Filesize
1KB

MD5
262153ae161575e0fc1d589fec4c5115

SHA1
99f2b019198a237754214a05b20d7bb89b106e72

SHA256
32b6311d19186ef7ddce70d92c35ae8e036982ae4d3f2e5fd84c706ee758136f

SHA512
ae5f261431e7d812623064033f3669f32a8f6d96322e0876f1d184f8c121867a89206c553d99aaa5c7abf09df6723022d1ad32f3477dd4b810c1e74862c11989

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

Filesize
1KB

MD5
43aa5f04dc397dbb2c0d997d8ba42183

SHA1
faf20c14c5ab9996d07d3fc128b5af35ab095f12

SHA256
61937d8bd9442a70272441b33a475a7f5b1f2a3dd92558588f93b5990443e5a1

SHA512
f38e02d32bdfbf98925c5d10c743d80e9b2c4dc9934adbdc5bf715dc5866a0444ef70f7964bafb965857908b2fa278934bb514159f509594041b20619ddecfb2

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

Filesize
1KB

MD5
7c70ae2e2cecb468f4b5e517cf46290a

SHA1
b54d76f6b3465e1e48496649328eae1f83086d56

SHA256
197dbbfaab543651c8b914b63ed906cb2eacd9dcdb7eb96b58fbf0252d4a9dcd

SHA512
d66f213d041b7fb2dcdb66eb3eaf15b617032155fb7faaf2adaec5532c60ff3adb429772cbb1f253f84cd52d3f3065843c6496133d5656fb50d65872eb0cb3a8

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_qsgvk3eu.vl4.ps1

Filesize
1B

MD5
c4ca4238a0b923820dcc509a6f75849b

SHA1
356a192b7913b04c54574d18c28d46e6395428ab

SHA256
6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b

SHA512
4dff4ea340f0a823f15d3f4f01ab62eae0e5da579ccb851f8db9dfe84c58b2b37b89903a740e1ee172da793a6e79d560e5f7f9bd058a12a280433ed6fa46510a

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp3D9C.tmp.bat

Filesize
162B

MD5
7d410c278c9bff01ce0a715ce68830c9

SHA1
676acd04d39bbda93edc38df632d5bf8328b7f07

SHA256
a17a28e8995f9ba3da368a8a7e26604477bf411659de91faebc64cd90a789c19

SHA512
25dbf01844d30de70e6fcb73b0538aaf2257e4b11d2859fbadd3814c3b760a4cee3a51c9e153f80222a446b8b5e56b6eb24acc3855fdde6815593a53a4a84349

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

Filesize
229KB

MD5
259101ea3a8a1c36a8ebe30f28deb851

SHA1
b5302bb4383bfa6e1f8a074182d1eecd79cd0caf

SHA256
91fd2cdc10b62a3aa10837c50c9dd2958f58a7c6feb6a5d29f73c5edca033999

SHA512
14c266cd69408d3cca1fa8dfeb0e9abedce87985b93bf6190b6436f74f122e06264c49c713d259eaa9f393180e3bef42462cb851686c2f32882cf03942e6dde3

Download Submit
C:\Users\Admin\AppData\Roaming\Loader (1).exe

Filesize
827KB

MD5
eefb801774c5ccb44153268a9357f5f1

SHA1
b1906b22e14edd142c52808ab3e5ba9346b85de5

SHA256
677aeb1981c58cba41a5d53ccbbf5b471e62dc49dc326570767da940560d840d

SHA512
1cf162fe6184d68dca514059d2de1123e80d0faac401765a54224aa5a987c9454bc92263fbec566835aa7b402f1f63ba59bb425ccc139e0a7391e66991f270b7

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

Filesize
77KB

MD5
7c4f97717ce74232ede2fc0b48956636

SHA1
d7dd219805af9fb9251214d598badc3d4d1b7bf8

SHA256
f84e5ceb6d0c53993bf5139e7e58dcc06c8cc7d6bc1e5e97171445f6fe01109d

SHA512
ad1963a20fc98927239eb1aaa6f881913ac5884c28c00b59637e4fd51dbafd376150e1e6a5cf8634f6a5610bd2286dc185b3f14362c06a613dfe40db528cea26

Download Submit
memory/1280-19-0x00000000008C0000-0x00000000008DA000-memory.dmp

Filesize
104KB

Download
memory/1396-31-0x0000019C32710000-0x0000019C32732000-memory.dmp

Filesize
136KB

Download
memory/1396-34-0x0000019C32840000-0x0000019C328B6000-memory.dmp

Filesize
472KB

Download
memory/1888-0-0x00007FFD7C7F3000-0x00007FFD7C7F4000-memory.dmp

Filesize
4KB

Download
memory/1888-1-0x0000000000960000-0x0000000000A84000-memory.dmp

Filesize
1.1MB

Download
memory/2472-20-0x0000000000D80000-0x0000000000E56000-memory.dmp

Filesize
856KB

Download
memory/2472-22-0x00000000735CE000-0x00000000735CF000-memory.dmp

Filesize
4KB

Download
memory/2472-26-0x0000000009280000-0x00000000092B8000-memory.dmp

Filesize
224KB

Download
memory/3560-18-0x0000014B88B40000-0x0000014B88B80000-memory.dmp

Filesize
256KB

Download
memory/3560-24-0x00007FFD7C7F0000-0x00007FFD7D1DC000-memory.dmp

Filesize
9.9MB

Download
memory/3560-21-0x00007FFD7C7F0000-0x00007FFD7D1DC000-memory.dmp

Filesize
9.9MB

Download