umbral | b929ede4c76d1db2d2b1698d401d658fbce5e440fd54f4071701aae69ed791e9

Analysis

max time kernel
147s
max time network
146s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
03-10-2024 17:33

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General

Target

RustAnticheat.exe
Size

1.1MB
MD5

84e9631aef9d0342cae8466ed841ca7f
SHA1

fed84e7f25bb9f337a99e820111e87be1de954aa
SHA256

b929ede4c76d1db2d2b1698d401d658fbce5e440fd54f4071701aae69ed791e9
SHA512

9fd3bf2966edb0ae54a9a46ded59fde75e6c7653078a5cac3563333a0f3ee1c197cfd622c2828855aacbc2023ff85f3d37a01dcb360a0b611aa1a43d59cdd36b
SSDEEP

24576:y1zV1C+mn91Bm1uyv43wswHTFZp/qg0GsO0iT7puGB:uh0I0yIYzFZ90Gstw

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/1291451585494515744/LKDGh0k0NWFEqtktblmpi9FMNE2PK1J-08hBfSDWZ6hts8lC3NILBGDzrEYeKRQMidcr

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral1/memory/4308-17-0x0000021884F10000-0x0000021884F50000-memory.dmp	family_umbral
behavioral1/files/0x000700000001ac5a-16.dat	family_umbral

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral1/files/0x000800000001ac59-13.dat	family_xworm
behavioral1/memory/224-19-0x0000000000810000-0x0000000000828000-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
4884	powershell.exe
1036	powershell.exe
4504	powershell.exe
3288	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
4788	Loader (1).exe
224	RuntimeBroker.exe
4308	Umbral.exe
4520	RuntimeBroker
912	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-1-5-21-160447019-1232603106-4168707212-1000\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

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
4328	schtasks.exe

Suspicious behavior: EnumeratesProcesses 13 IoCs

pid	Process
1036	powershell.exe
1036	powershell.exe
1036	powershell.exe
4504	powershell.exe
4504	powershell.exe
4504	powershell.exe
3288	powershell.exe
3288	powershell.exe
3288	powershell.exe
4884	powershell.exe
4884	powershell.exe
4884	powershell.exe
224	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	224	RuntimeBroker.exe
Token: SeDebugPrivilege	4308	Umbral.exe
Token: SeIncreaseQuotaPrivilege	2252	wmic.exe
Token: SeSecurityPrivilege	2252	wmic.exe
Token: SeTakeOwnershipPrivilege	2252	wmic.exe
Token: SeLoadDriverPrivilege	2252	wmic.exe
Token: SeSystemProfilePrivilege	2252	wmic.exe
Token: SeSystemtimePrivilege	2252	wmic.exe
Token: SeProfSingleProcessPrivilege	2252	wmic.exe
Token: SeIncBasePriorityPrivilege	2252	wmic.exe
Token: SeCreatePagefilePrivilege	2252	wmic.exe
Token: SeBackupPrivilege	2252	wmic.exe
Token: SeRestorePrivilege	2252	wmic.exe
Token: SeShutdownPrivilege	2252	wmic.exe
Token: SeDebugPrivilege	2252	wmic.exe
Token: SeSystemEnvironmentPrivilege	2252	wmic.exe
Token: SeRemoteShutdownPrivilege	2252	wmic.exe
Token: SeUndockPrivilege	2252	wmic.exe
Token: SeManageVolumePrivilege	2252	wmic.exe
Token: 33	2252	wmic.exe
Token: 34	2252	wmic.exe
Token: 35	2252	wmic.exe
Token: 36	2252	wmic.exe
Token: SeIncreaseQuotaPrivilege	2252	wmic.exe
Token: SeSecurityPrivilege	2252	wmic.exe
Token: SeTakeOwnershipPrivilege	2252	wmic.exe
Token: SeLoadDriverPrivilege	2252	wmic.exe
Token: SeSystemProfilePrivilege	2252	wmic.exe
Token: SeSystemtimePrivilege	2252	wmic.exe
Token: SeProfSingleProcessPrivilege	2252	wmic.exe
Token: SeIncBasePriorityPrivilege	2252	wmic.exe
Token: SeCreatePagefilePrivilege	2252	wmic.exe
Token: SeBackupPrivilege	2252	wmic.exe
Token: SeRestorePrivilege	2252	wmic.exe
Token: SeShutdownPrivilege	2252	wmic.exe
Token: SeDebugPrivilege	2252	wmic.exe
Token: SeSystemEnvironmentPrivilege	2252	wmic.exe
Token: SeRemoteShutdownPrivilege	2252	wmic.exe
Token: SeUndockPrivilege	2252	wmic.exe
Token: SeManageVolumePrivilege	2252	wmic.exe
Token: 33	2252	wmic.exe
Token: 34	2252	wmic.exe
Token: 35	2252	wmic.exe
Token: 36	2252	wmic.exe
Token: SeDebugPrivilege	1036	powershell.exe
Token: SeIncreaseQuotaPrivilege	1036	powershell.exe
Token: SeSecurityPrivilege	1036	powershell.exe
Token: SeTakeOwnershipPrivilege	1036	powershell.exe
Token: SeLoadDriverPrivilege	1036	powershell.exe
Token: SeSystemProfilePrivilege	1036	powershell.exe
Token: SeSystemtimePrivilege	1036	powershell.exe
Token: SeProfSingleProcessPrivilege	1036	powershell.exe
Token: SeIncBasePriorityPrivilege	1036	powershell.exe
Token: SeCreatePagefilePrivilege	1036	powershell.exe
Token: SeBackupPrivilege	1036	powershell.exe
Token: SeRestorePrivilege	1036	powershell.exe
Token: SeShutdownPrivilege	1036	powershell.exe
Token: SeDebugPrivilege	1036	powershell.exe
Token: SeSystemEnvironmentPrivilege	1036	powershell.exe
Token: SeRemoteShutdownPrivilege	1036	powershell.exe
Token: SeUndockPrivilege	1036	powershell.exe
Token: SeManageVolumePrivilege	1036	powershell.exe
Token: 33	1036	powershell.exe
Token: 34	1036	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
224	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 3080 wrote to memory of 4788	3080	RustAnticheat.exe	73
PID 3080 wrote to memory of 4788	3080	RustAnticheat.exe	73
PID 3080 wrote to memory of 4788	3080	RustAnticheat.exe	73
PID 3080 wrote to memory of 224	3080	RustAnticheat.exe	74
PID 3080 wrote to memory of 224	3080	RustAnticheat.exe	74
PID 3080 wrote to memory of 4308	3080	RustAnticheat.exe	75
PID 3080 wrote to memory of 4308	3080	RustAnticheat.exe	75
PID 4308 wrote to memory of 2252	4308	Umbral.exe	76
PID 4308 wrote to memory of 2252	4308	Umbral.exe	76
PID 224 wrote to memory of 1036	224	RuntimeBroker.exe	80
PID 224 wrote to memory of 1036	224	RuntimeBroker.exe	80
PID 224 wrote to memory of 4504	224	RuntimeBroker.exe	83
PID 224 wrote to memory of 4504	224	RuntimeBroker.exe	83
PID 224 wrote to memory of 3288	224	RuntimeBroker.exe	85
PID 224 wrote to memory of 3288	224	RuntimeBroker.exe	85
PID 224 wrote to memory of 4884	224	RuntimeBroker.exe	87
PID 224 wrote to memory of 4884	224	RuntimeBroker.exe	87
PID 224 wrote to memory of 4328	224	RuntimeBroker.exe	89
PID 224 wrote to memory of 4328	224	RuntimeBroker.exe	89

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:3080
- 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:4788
- 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:224
- - 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:1036
- - 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:4504
- - 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:3288
- - 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:4884
- - 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:4328
- C:\Users\Admin\AppData\Roaming\Umbral.exe
  "C:\Users\Admin\AppData\Roaming\Umbral.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4308
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:2252

C:\Users\Admin\RuntimeBroker
C:\Users\Admin\RuntimeBroker
1⤵
- Executes dropped EXE
PID:4520

C:\Users\Admin\RuntimeBroker
C:\Users\Admin\RuntimeBroker
1⤵
- Executes dropped EXE
PID:912

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
a4535d4a6584fcb9f1358ecdba1a7ea9

SHA1
2f51df9fef089c109e835b6b383159ddb089228a

SHA256
6befaa0c5d48734eb6ab9d1519e6369806db44debc7d2cfe370d04fde1f27ae4

SHA512
bd45aa11b91101d2a23e0fed69763c445b76c9705e84dfcd988313cb1d8f3d37d46c2f5426bfae6e7e2f5ebaacda637bc1a1bf297d43fff65b4c8892bbd36945

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

Filesize
1KB

MD5
cecb429a6b38764939f6b6fe4615ca40

SHA1
41051cfc44c24474cc88599cea166b89133d4728

SHA256
60ad9e53f2112b23da074dd17556d731da17d7f654492d2ff1ab89c0d83fa4c6

SHA512
dc9b8fa8477e2ca61d3fc6a767b68f4528b734bacc873df802f71e4e0ebd2a8c9bc2ecb9143be47c71801693b8bfabc6f8dbfc72bba6d05930db20855ffc9604

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

Filesize
1KB

MD5
56fa67efa74c34191150ad3843de0dda

SHA1
cfa2905dba6ff57d4cf56d505714a2de10c1e19a

SHA256
03be8e43f5f7c434365a47890b01245814d2ccc6a3963ca664283c27e60fbde5

SHA512
57e721f275fda8947f4ad91dcc131a5a6482e61efcd623a618f1bcde4b79f6b43558070b2cd477eb1841d0f5de19334613e79204be126c2940cd4e5a911df877

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ndqqkrrm.ipo.ps1

Filesize
1B

MD5
c4ca4238a0b923820dcc509a6f75849b

SHA1
356a192b7913b04c54574d18c28d46e6395428ab

SHA256
6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b

SHA512
4dff4ea340f0a823f15d3f4f01ab62eae0e5da579ccb851f8db9dfe84c58b2b37b89903a740e1ee172da793a6e79d560e5f7f9bd058a12a280433ed6fa46510a

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
73KB

MD5
96af510fc9c01219079834a9c95ddb55

SHA1
14f0c50ad5421350c8ca7f6eaeefd6ab5da38a09

SHA256
3718589c2b1ee0e11197034c51383245fd5cee736a4187bc7d4bbc22daeee598

SHA512
0c560efa6d436435bf1aaaa1c0a1d77d68655591368d8010267ca4b5a24e51204e4bdefce1f7adb6e93b6ecc9401c335e63f886dfd12cec93c759727df8d2da2

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

Filesize
229KB

MD5
471fb39fc8ef1c26c8b6b332531d79c5

SHA1
fba16c9c0de9ea00cebf4f90ab7095fd0e892ef3

SHA256
c672509e54b49ee79d9a61f2e9deb18311427267799fb65523e71cf76e814830

SHA512
a2cd9fc672ef6fc904a7f0a3b8affff554c5035363b074df48838a9a5c3e48e880cc97fc0e8cf4bfa68d430fd6b01c273fa7fef07d0f70403a15f47c7169f015

Download Submit
memory/224-21-0x00007FFA2E870000-0x00007FFA2F25C000-memory.dmp

Filesize
9.9MB

Download
memory/224-19-0x0000000000810000-0x0000000000828000-memory.dmp

Filesize
96KB

Download
memory/224-205-0x00007FFA2E870000-0x00007FFA2F25C000-memory.dmp

Filesize
9.9MB

Download
memory/1036-31-0x0000024820980000-0x00000248209A2000-memory.dmp

Filesize
136KB

Download
memory/1036-34-0x0000024820B60000-0x0000024820BD6000-memory.dmp

Filesize
472KB

Download
memory/3080-0-0x00007FFA2E873000-0x00007FFA2E874000-memory.dmp

Filesize
4KB

Download
memory/3080-1-0x0000000000440000-0x0000000000564000-memory.dmp

Filesize
1.1MB

Download
memory/4308-22-0x00007FFA2E870000-0x00007FFA2F25C000-memory.dmp

Filesize
9.9MB

Download
memory/4308-24-0x00007FFA2E870000-0x00007FFA2F25C000-memory.dmp

Filesize
9.9MB

Download
memory/4308-17-0x0000021884F10000-0x0000021884F50000-memory.dmp

Filesize
256KB

Download
memory/4788-26-0x0000000008B20000-0x0000000008B58000-memory.dmp

Filesize
224KB

Download
memory/4788-20-0x0000000000620000-0x00000000006F6000-memory.dmp

Filesize
856KB

Download