umbral | 20868115f180702553380c551df502535b8aa01c3ef630d408edd849896e631a

Analysis

max time kernel
128s
max time network
128s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-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
behavioral1/files/0x00070000000193d9-16.dat	family_umbral
behavioral1/memory/2900-19-0x0000000001280000-0x00000000012C0000-memory.dmp	family_umbral

Detect Xworm Payload 4 IoCs

resource	yara_rule
behavioral1/files/0x00070000000193c4-11.dat	family_xworm
behavioral1/memory/2744-18-0x00000000011C0000-0x00000000011DA000-memory.dmp	family_xworm
behavioral1/memory/300-56-0x0000000000090000-0x00000000000AA000-memory.dmp	family_xworm
behavioral1/memory/2276-59-0x00000000009C0000-0x00000000009DA000-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
756	powershell.exe
1536	powershell.exe
2040	powershell.exe
2168	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
2188	Loader (1).exe
2744	RuntimeBroker.exe
2900	Litvin.exe
300	RuntimeBroker
2276	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-1-5-21-3290804112-2823094203-3137964600-1000\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
4	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
1696	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
3000	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
756	powershell.exe
1536	powershell.exe
2040	powershell.exe
2168	powershell.exe
2744	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 49 IoCs

description	pid	Process
Token: SeDebugPrivilege	2744	RuntimeBroker.exe
Token: SeDebugPrivilege	2900	Litvin.exe
Token: SeIncreaseQuotaPrivilege	2576	wmic.exe
Token: SeSecurityPrivilege	2576	wmic.exe
Token: SeTakeOwnershipPrivilege	2576	wmic.exe
Token: SeLoadDriverPrivilege	2576	wmic.exe
Token: SeSystemProfilePrivilege	2576	wmic.exe
Token: SeSystemtimePrivilege	2576	wmic.exe
Token: SeProfSingleProcessPrivilege	2576	wmic.exe
Token: SeIncBasePriorityPrivilege	2576	wmic.exe
Token: SeCreatePagefilePrivilege	2576	wmic.exe
Token: SeBackupPrivilege	2576	wmic.exe
Token: SeRestorePrivilege	2576	wmic.exe
Token: SeShutdownPrivilege	2576	wmic.exe
Token: SeDebugPrivilege	2576	wmic.exe
Token: SeSystemEnvironmentPrivilege	2576	wmic.exe
Token: SeRemoteShutdownPrivilege	2576	wmic.exe
Token: SeUndockPrivilege	2576	wmic.exe
Token: SeManageVolumePrivilege	2576	wmic.exe
Token: 33	2576	wmic.exe
Token: 34	2576	wmic.exe
Token: 35	2576	wmic.exe
Token: SeIncreaseQuotaPrivilege	2576	wmic.exe
Token: SeSecurityPrivilege	2576	wmic.exe
Token: SeTakeOwnershipPrivilege	2576	wmic.exe
Token: SeLoadDriverPrivilege	2576	wmic.exe
Token: SeSystemProfilePrivilege	2576	wmic.exe
Token: SeSystemtimePrivilege	2576	wmic.exe
Token: SeProfSingleProcessPrivilege	2576	wmic.exe
Token: SeIncBasePriorityPrivilege	2576	wmic.exe
Token: SeCreatePagefilePrivilege	2576	wmic.exe
Token: SeBackupPrivilege	2576	wmic.exe
Token: SeRestorePrivilege	2576	wmic.exe
Token: SeShutdownPrivilege	2576	wmic.exe
Token: SeDebugPrivilege	2576	wmic.exe
Token: SeSystemEnvironmentPrivilege	2576	wmic.exe
Token: SeRemoteShutdownPrivilege	2576	wmic.exe
Token: SeUndockPrivilege	2576	wmic.exe
Token: SeManageVolumePrivilege	2576	wmic.exe
Token: 33	2576	wmic.exe
Token: 34	2576	wmic.exe
Token: 35	2576	wmic.exe
Token: SeDebugPrivilege	756	powershell.exe
Token: SeDebugPrivilege	1536	powershell.exe
Token: SeDebugPrivilege	2040	powershell.exe
Token: SeDebugPrivilege	2168	powershell.exe
Token: SeDebugPrivilege	2744	RuntimeBroker.exe
Token: SeDebugPrivilege	300	RuntimeBroker
Token: SeDebugPrivilege	2276	RuntimeBroker

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2744	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 43 IoCs

description	pid	Process	procid_target
PID 2216 wrote to memory of 2188	2216	RustAnticheat.exe	30
PID 2216 wrote to memory of 2188	2216	RustAnticheat.exe	30
PID 2216 wrote to memory of 2188	2216	RustAnticheat.exe	30
PID 2216 wrote to memory of 2188	2216	RustAnticheat.exe	30
PID 2216 wrote to memory of 2744	2216	RustAnticheat.exe	31
PID 2216 wrote to memory of 2744	2216	RustAnticheat.exe	31
PID 2216 wrote to memory of 2744	2216	RustAnticheat.exe	31
PID 2216 wrote to memory of 2900	2216	RustAnticheat.exe	32
PID 2216 wrote to memory of 2900	2216	RustAnticheat.exe	32
PID 2216 wrote to memory of 2900	2216	RustAnticheat.exe	32
PID 2900 wrote to memory of 2576	2900	Litvin.exe	33
PID 2900 wrote to memory of 2576	2900	Litvin.exe	33
PID 2900 wrote to memory of 2576	2900	Litvin.exe	33
PID 2744 wrote to memory of 756	2744	RuntimeBroker.exe	37
PID 2744 wrote to memory of 756	2744	RuntimeBroker.exe	37
PID 2744 wrote to memory of 756	2744	RuntimeBroker.exe	37
PID 2744 wrote to memory of 1536	2744	RuntimeBroker.exe	39
PID 2744 wrote to memory of 1536	2744	RuntimeBroker.exe	39
PID 2744 wrote to memory of 1536	2744	RuntimeBroker.exe	39
PID 2744 wrote to memory of 2040	2744	RuntimeBroker.exe	41
PID 2744 wrote to memory of 2040	2744	RuntimeBroker.exe	41
PID 2744 wrote to memory of 2040	2744	RuntimeBroker.exe	41
PID 2744 wrote to memory of 2168	2744	RuntimeBroker.exe	43
PID 2744 wrote to memory of 2168	2744	RuntimeBroker.exe	43
PID 2744 wrote to memory of 2168	2744	RuntimeBroker.exe	43
PID 2744 wrote to memory of 3000	2744	RuntimeBroker.exe	45
PID 2744 wrote to memory of 3000	2744	RuntimeBroker.exe	45
PID 2744 wrote to memory of 3000	2744	RuntimeBroker.exe	45
PID 680 wrote to memory of 300	680	taskeng.exe	48
PID 680 wrote to memory of 300	680	taskeng.exe	48
PID 680 wrote to memory of 300	680	taskeng.exe	48
PID 680 wrote to memory of 2276	680	taskeng.exe	50
PID 680 wrote to memory of 2276	680	taskeng.exe	50
PID 680 wrote to memory of 2276	680	taskeng.exe	50
PID 2744 wrote to memory of 1036	2744	RuntimeBroker.exe	51
PID 2744 wrote to memory of 1036	2744	RuntimeBroker.exe	51
PID 2744 wrote to memory of 1036	2744	RuntimeBroker.exe	51
PID 2744 wrote to memory of 2440	2744	RuntimeBroker.exe	53
PID 2744 wrote to memory of 2440	2744	RuntimeBroker.exe	53
PID 2744 wrote to memory of 2440	2744	RuntimeBroker.exe	53
PID 2440 wrote to memory of 1696	2440	cmd.exe	55
PID 2440 wrote to memory of 1696	2440	cmd.exe	55
PID 2440 wrote to memory of 1696	2440	cmd.exe	55

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:2216
- 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:2188
- 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:2744
- - 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:756
- - 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:1536
- - 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:2040
- - 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:2168
- - 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:3000
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /delete /f /tn "RuntimeBroker"
    3⤵
    PID:1036
- - C:\Windows\system32\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpF25A.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2440
  - - C:\Windows\system32\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:1696
- 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:2900
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:2576

C:\Windows\system32\taskeng.exe
taskeng.exe {E1397FC4-046D-4111-9DC0-F7914AB62C20} S-1-5-21-3290804112-2823094203-3137964600-1000:VORHPBAB\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:680
- C:\Users\Admin\RuntimeBroker
  C:\Users\Admin\RuntimeBroker
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:300
- C:\Users\Admin\RuntimeBroker
  C:\Users\Admin\RuntimeBroker
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2276

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\tmpF25A.tmp.bat

Filesize
162B

MD5
19d7dacb2917eb86163ad9afbc3858fc

SHA1
c4d6fa2b5db04dd1db85c30c65948b786b57e04f

SHA256
91bfc1a333c92a93e9c797ebb288b4f5b94988c03e7b66c33799b74b6be923b7

SHA512
c901b882dc3ba24b484f92eaadd46bf9c4dbb0aaff93393fb5dfbb4dd7946bfeefce3e93718b336244af5a01c8d8fc510f023bbfd20e08b10817bf7f1597a9af

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
e09fbc7bb38fd387709b62c0f03548b4

SHA1
16cc24afa8c0c989092f3aebc35f8a0c5b813ec1

SHA256
aacb2a7e99d44d6c741113e2d45d508c58dfc09bacb7dd234e3721a009cc9d50

SHA512
e681527a2cbd14c9f34dd28415e61bb4bfec6ff21cec0b4cc115736b5a9100b74cc58700c62329f8e9d0bb1f914963e038de927779fb4cc87c4fbf791f470152

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

Filesize
77KB

MD5
7c4f97717ce74232ede2fc0b48956636

SHA1
d7dd219805af9fb9251214d598badc3d4d1b7bf8

SHA256
f84e5ceb6d0c53993bf5139e7e58dcc06c8cc7d6bc1e5e97171445f6fe01109d

SHA512
ad1963a20fc98927239eb1aaa6f881913ac5884c28c00b59637e4fd51dbafd376150e1e6a5cf8634f6a5610bd2286dc185b3f14362c06a613dfe40db528cea26

Download Submit
memory/300-56-0x0000000000090000-0x00000000000AA000-memory.dmp

Filesize
104KB

Download
memory/756-28-0x000000001B640000-0x000000001B922000-memory.dmp

Filesize
2.9MB

Download
memory/756-29-0x0000000001E80000-0x0000000001E88000-memory.dmp

Filesize
32KB

Download
memory/1536-35-0x000000001B4C0000-0x000000001B7A2000-memory.dmp

Filesize
2.9MB

Download
memory/1536-36-0x00000000028A0000-0x00000000028A8000-memory.dmp

Filesize
32KB

Download
memory/2188-22-0x0000000000330000-0x000000000033A000-memory.dmp

Filesize
40KB

Download
memory/2188-21-0x0000000000330000-0x000000000033A000-memory.dmp

Filesize
40KB

Download
memory/2188-20-0x00000000009B0000-0x0000000000A86000-memory.dmp

Filesize
856KB

Download
memory/2188-52-0x0000000000330000-0x000000000033A000-memory.dmp

Filesize
40KB

Download
memory/2216-0-0x000007FEF5F13000-0x000007FEF5F14000-memory.dmp

Filesize
4KB

Download
memory/2216-1-0x0000000000E90000-0x0000000000FB4000-memory.dmp

Filesize
1.1MB

Download
memory/2276-59-0x00000000009C0000-0x00000000009DA000-memory.dmp

Filesize
104KB

Download
memory/2744-18-0x00000000011C0000-0x00000000011DA000-memory.dmp

Filesize
104KB

Download
memory/2900-19-0x0000000001280000-0x00000000012C0000-memory.dmp

Filesize
256KB

Download