umbral | 20868115f180702553380c551df502535b8aa01c3ef630d408edd849896e631a

Analysis

max time kernel
129s
max time network
128s
platform
windows7_x64
resource
win7-20240708-en
resource tags

arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-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
behavioral3/files/0x0007000000018636-16.dat	family_umbral
behavioral3/memory/2764-19-0x0000000000BB0000-0x0000000000BF0000-memory.dmp	family_umbral

Detect Xworm Payload 4 IoCs

resource	yara_rule
behavioral3/files/0x000b000000018617-12.dat	family_xworm
behavioral3/memory/2668-17-0x0000000000A60000-0x0000000000A7A000-memory.dmp	family_xworm
behavioral3/memory/1372-57-0x0000000000910000-0x000000000092A000-memory.dmp	family_xworm
behavioral3/memory/756-60-0x0000000000C60000-0x0000000000C7A000-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
2376	powershell.exe
2160	powershell.exe
2188	powershell.exe
2544	powershell.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 5 IoCs

pid	Process
1056	Loader (1).exe
2668	RuntimeBroker.exe
2764	Litvin.exe
1372	RuntimeBroker
756	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-1-5-21-3551809350-4263495960-1443967649-1000\Software\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "C:\\Users\\Admin\\RuntimeBroker"	RuntimeBroker.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
6	ip-api.com

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
864	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
2500	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2188	powershell.exe
2544	powershell.exe
2376	powershell.exe
2160	powershell.exe
2668	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 49 IoCs

description	pid	Process
Token: SeDebugPrivilege	2668	RuntimeBroker.exe
Token: SeDebugPrivilege	2764	Litvin.exe
Token: SeDebugPrivilege	2188	powershell.exe
Token: SeIncreaseQuotaPrivilege	1380	wmic.exe
Token: SeSecurityPrivilege	1380	wmic.exe
Token: SeTakeOwnershipPrivilege	1380	wmic.exe
Token: SeLoadDriverPrivilege	1380	wmic.exe
Token: SeSystemProfilePrivilege	1380	wmic.exe
Token: SeSystemtimePrivilege	1380	wmic.exe
Token: SeProfSingleProcessPrivilege	1380	wmic.exe
Token: SeIncBasePriorityPrivilege	1380	wmic.exe
Token: SeCreatePagefilePrivilege	1380	wmic.exe
Token: SeBackupPrivilege	1380	wmic.exe
Token: SeRestorePrivilege	1380	wmic.exe
Token: SeShutdownPrivilege	1380	wmic.exe
Token: SeDebugPrivilege	1380	wmic.exe
Token: SeSystemEnvironmentPrivilege	1380	wmic.exe
Token: SeRemoteShutdownPrivilege	1380	wmic.exe
Token: SeUndockPrivilege	1380	wmic.exe
Token: SeManageVolumePrivilege	1380	wmic.exe
Token: 33	1380	wmic.exe
Token: 34	1380	wmic.exe
Token: 35	1380	wmic.exe
Token: SeIncreaseQuotaPrivilege	1380	wmic.exe
Token: SeSecurityPrivilege	1380	wmic.exe
Token: SeTakeOwnershipPrivilege	1380	wmic.exe
Token: SeLoadDriverPrivilege	1380	wmic.exe
Token: SeSystemProfilePrivilege	1380	wmic.exe
Token: SeSystemtimePrivilege	1380	wmic.exe
Token: SeProfSingleProcessPrivilege	1380	wmic.exe
Token: SeIncBasePriorityPrivilege	1380	wmic.exe
Token: SeCreatePagefilePrivilege	1380	wmic.exe
Token: SeBackupPrivilege	1380	wmic.exe
Token: SeRestorePrivilege	1380	wmic.exe
Token: SeShutdownPrivilege	1380	wmic.exe
Token: SeDebugPrivilege	1380	wmic.exe
Token: SeSystemEnvironmentPrivilege	1380	wmic.exe
Token: SeRemoteShutdownPrivilege	1380	wmic.exe
Token: SeUndockPrivilege	1380	wmic.exe
Token: SeManageVolumePrivilege	1380	wmic.exe
Token: 33	1380	wmic.exe
Token: 34	1380	wmic.exe
Token: 35	1380	wmic.exe
Token: SeDebugPrivilege	2544	powershell.exe
Token: SeDebugPrivilege	2376	powershell.exe
Token: SeDebugPrivilege	2160	powershell.exe
Token: SeDebugPrivilege	2668	RuntimeBroker.exe
Token: SeDebugPrivilege	1372	RuntimeBroker
Token: SeDebugPrivilege	756	RuntimeBroker

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2668	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 43 IoCs

description	pid	Process	procid_target
PID 2084 wrote to memory of 1056	2084	RustAnticheat.exe	30
PID 2084 wrote to memory of 1056	2084	RustAnticheat.exe	30
PID 2084 wrote to memory of 1056	2084	RustAnticheat.exe	30
PID 2084 wrote to memory of 1056	2084	RustAnticheat.exe	30
PID 2084 wrote to memory of 2668	2084	RustAnticheat.exe	31
PID 2084 wrote to memory of 2668	2084	RustAnticheat.exe	31
PID 2084 wrote to memory of 2668	2084	RustAnticheat.exe	31
PID 2084 wrote to memory of 2764	2084	RustAnticheat.exe	32
PID 2084 wrote to memory of 2764	2084	RustAnticheat.exe	32
PID 2084 wrote to memory of 2764	2084	RustAnticheat.exe	32
PID 2668 wrote to memory of 2188	2668	RuntimeBroker.exe	34
PID 2668 wrote to memory of 2188	2668	RuntimeBroker.exe	34
PID 2668 wrote to memory of 2188	2668	RuntimeBroker.exe	34
PID 2764 wrote to memory of 1380	2764	Litvin.exe	36
PID 2764 wrote to memory of 1380	2764	Litvin.exe	36
PID 2764 wrote to memory of 1380	2764	Litvin.exe	36
PID 2668 wrote to memory of 2544	2668	RuntimeBroker.exe	39
PID 2668 wrote to memory of 2544	2668	RuntimeBroker.exe	39
PID 2668 wrote to memory of 2544	2668	RuntimeBroker.exe	39
PID 2668 wrote to memory of 2376	2668	RuntimeBroker.exe	41
PID 2668 wrote to memory of 2376	2668	RuntimeBroker.exe	41
PID 2668 wrote to memory of 2376	2668	RuntimeBroker.exe	41
PID 2668 wrote to memory of 2160	2668	RuntimeBroker.exe	43
PID 2668 wrote to memory of 2160	2668	RuntimeBroker.exe	43
PID 2668 wrote to memory of 2160	2668	RuntimeBroker.exe	43
PID 2668 wrote to memory of 2500	2668	RuntimeBroker.exe	45
PID 2668 wrote to memory of 2500	2668	RuntimeBroker.exe	45
PID 2668 wrote to memory of 2500	2668	RuntimeBroker.exe	45
PID 2216 wrote to memory of 1372	2216	taskeng.exe	48
PID 2216 wrote to memory of 1372	2216	taskeng.exe	48
PID 2216 wrote to memory of 1372	2216	taskeng.exe	48
PID 2216 wrote to memory of 756	2216	taskeng.exe	49
PID 2216 wrote to memory of 756	2216	taskeng.exe	49
PID 2216 wrote to memory of 756	2216	taskeng.exe	49
PID 2668 wrote to memory of 2492	2668	RuntimeBroker.exe	50
PID 2668 wrote to memory of 2492	2668	RuntimeBroker.exe	50
PID 2668 wrote to memory of 2492	2668	RuntimeBroker.exe	50
PID 2668 wrote to memory of 880	2668	RuntimeBroker.exe	52
PID 2668 wrote to memory of 880	2668	RuntimeBroker.exe	52
PID 2668 wrote to memory of 880	2668	RuntimeBroker.exe	52
PID 880 wrote to memory of 864	880	cmd.exe	54
PID 880 wrote to memory of 864	880	cmd.exe	54
PID 880 wrote to memory of 864	880	cmd.exe	54

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:2084
- 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:1056
- 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:2668
- - 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:2188
- - 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
    - Suspicious use of AdjustPrivilegeToken
    PID:2544
- - 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
    - Suspicious use of AdjustPrivilegeToken
    PID:2376
- - 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
    - Suspicious use of AdjustPrivilegeToken
    PID:2160
- - 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:2500
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /delete /f /tn "RuntimeBroker"
    3⤵
    PID:2492
- - C:\Windows\system32\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpF43E.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:880
  - - C:\Windows\system32\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:864
- 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:2764
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:1380

C:\Windows\system32\taskeng.exe
taskeng.exe {1FD67107-4F6F-4F12-BB31-1178F78E3DFC} S-1-5-21-3551809350-4263495960-1443967649-1000:NNYJZAHP\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2216
- C:\Users\Admin\RuntimeBroker
  C:\Users\Admin\RuntimeBroker
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1372
- C:\Users\Admin\RuntimeBroker
  C:\Users\Admin\RuntimeBroker
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:756

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\Temp\tmpF43E.tmp.bat

Filesize
162B

MD5
dde3550c6018de82ebb2e772a37242f1

SHA1
6591c69e66e38b667a35ea14199bea2091e327ea

SHA256
2c4f1fe0e7885c6ec2aaf919053d0e0265416ca20c3870c9ee2eacefbf18ff95

SHA512
cf67a4f46d61ec097fee1a06b25be116e1dc3755de0852dcd60a1fb36f51df22a6fe261b55410db761f675b03c3b6905ca4a9921179adde3eefe3ca56626c761

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\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
bd5ac13c3fa615c538cc565c7357dce3

SHA1
f459c92b39fd88cd0ccb3810ac99a1fdd60ff48d

SHA256
88a37c57d60343d78e75b696ba20d9e2875cb3895a5d545745f2d63a96b54ad7

SHA512
85223db571ba48f632458d63f827eaa5c9faa7ebc304da10860ad79a0eea566b490adc0c25c2ead4adf423ff21f7b2ec2fa72aff12e84f961b61a9076bd6a519

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

Filesize
77KB

MD5
7c4f97717ce74232ede2fc0b48956636

SHA1
d7dd219805af9fb9251214d598badc3d4d1b7bf8

SHA256
f84e5ceb6d0c53993bf5139e7e58dcc06c8cc7d6bc1e5e97171445f6fe01109d

SHA512
ad1963a20fc98927239eb1aaa6f881913ac5884c28c00b59637e4fd51dbafd376150e1e6a5cf8634f6a5610bd2286dc185b3f14362c06a613dfe40db528cea26

Download Submit
memory/756-60-0x0000000000C60000-0x0000000000C7A000-memory.dmp

Filesize
104KB

Download
memory/1056-22-0x0000000000250000-0x000000000025A000-memory.dmp

Filesize
40KB

Download
memory/1056-53-0x0000000000250000-0x000000000025A000-memory.dmp

Filesize
40KB

Download
memory/1056-23-0x0000000000250000-0x000000000025A000-memory.dmp

Filesize
40KB

Download
memory/1056-20-0x00000000011D0000-0x00000000012A6000-memory.dmp

Filesize
856KB

Download
memory/1372-57-0x0000000000910000-0x000000000092A000-memory.dmp

Filesize
104KB

Download
memory/2084-0-0x000007FEF5FE3000-0x000007FEF5FE4000-memory.dmp

Filesize
4KB

Download
memory/2084-1-0x0000000000380000-0x00000000004A4000-memory.dmp

Filesize
1.1MB

Download
memory/2188-29-0x000000001B730000-0x000000001BA12000-memory.dmp

Filesize
2.9MB

Download
memory/2188-30-0x0000000001E20000-0x0000000001E28000-memory.dmp

Filesize
32KB

Download
memory/2544-36-0x000000001B6C0000-0x000000001B9A2000-memory.dmp

Filesize
2.9MB

Download
memory/2544-37-0x0000000002290000-0x0000000002298000-memory.dmp

Filesize
32KB

Download
memory/2668-52-0x000007FEF5FE0000-0x000007FEF69CC000-memory.dmp

Filesize
9.9MB

Download
memory/2668-17-0x0000000000A60000-0x0000000000A7A000-memory.dmp

Filesize
104KB

Download
memory/2668-21-0x000007FEF5FE0000-0x000007FEF69CC000-memory.dmp

Filesize
9.9MB

Download
memory/2668-71-0x000007FEF5FE0000-0x000007FEF69CC000-memory.dmp

Filesize
9.9MB

Download
memory/2764-19-0x0000000000BB0000-0x0000000000BF0000-memory.dmp

Filesize
256KB

Download