umbral | 8ff6ca14eac4b42391697608e3cf0c6fe433e58ac965bef66ec32888305464d9

Analysis

max time kernel
4s
max time network
4s
platform
windows7_x64
resource
win7-20240704-en
resource tags

arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
submitted
26-08-2024 20:15

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General

Target

Umbral.exe
Size

232KB
MD5

b19a46354270983374d8a6c2e1de3eff
SHA1

1e0c163fd3d63d26dd3f271a3e348b3d69140c7d
SHA256

8ff6ca14eac4b42391697608e3cf0c6fe433e58ac965bef66ec32888305464d9
SHA512

829a6b6c93c5f98ac8b2633608c6d05247e8b84b9eb188ffaf69a6339019fd92772730325de9ef378812693203abe19cff289b1feb7ca8149dcbeb857d307b6d
SSDEEP

6144:BloZM+rIkd8g+EtXHkv/iD4yF4W4+ZRS23q459cTub8e1mQvi:zoZtL+EP8yF4W4+ZRS23q459cmW

Score

10^/10

umbral execution stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/2532-1-0x0000000000920000-0x0000000000960000-memory.dmp	family_umbral

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
2844	powershell.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

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2532	Umbral.exe

Suspicious use of AdjustPrivilegeToken 41 IoCs

description	pid	Process
Token: SeDebugPrivilege	2532	Umbral.exe
Token: SeIncreaseQuotaPrivilege	2400	wmic.exe
Token: SeSecurityPrivilege	2400	wmic.exe
Token: SeTakeOwnershipPrivilege	2400	wmic.exe
Token: SeLoadDriverPrivilege	2400	wmic.exe
Token: SeSystemProfilePrivilege	2400	wmic.exe
Token: SeSystemtimePrivilege	2400	wmic.exe
Token: SeProfSingleProcessPrivilege	2400	wmic.exe
Token: SeIncBasePriorityPrivilege	2400	wmic.exe
Token: SeCreatePagefilePrivilege	2400	wmic.exe
Token: SeBackupPrivilege	2400	wmic.exe
Token: SeRestorePrivilege	2400	wmic.exe
Token: SeShutdownPrivilege	2400	wmic.exe
Token: SeDebugPrivilege	2400	wmic.exe
Token: SeSystemEnvironmentPrivilege	2400	wmic.exe
Token: SeRemoteShutdownPrivilege	2400	wmic.exe
Token: SeUndockPrivilege	2400	wmic.exe
Token: SeManageVolumePrivilege	2400	wmic.exe
Token: 33	2400	wmic.exe
Token: 34	2400	wmic.exe
Token: 35	2400	wmic.exe
Token: SeIncreaseQuotaPrivilege	2400	wmic.exe
Token: SeSecurityPrivilege	2400	wmic.exe
Token: SeTakeOwnershipPrivilege	2400	wmic.exe
Token: SeLoadDriverPrivilege	2400	wmic.exe
Token: SeSystemProfilePrivilege	2400	wmic.exe
Token: SeSystemtimePrivilege	2400	wmic.exe
Token: SeProfSingleProcessPrivilege	2400	wmic.exe
Token: SeIncBasePriorityPrivilege	2400	wmic.exe
Token: SeCreatePagefilePrivilege	2400	wmic.exe
Token: SeBackupPrivilege	2400	wmic.exe
Token: SeRestorePrivilege	2400	wmic.exe
Token: SeShutdownPrivilege	2400	wmic.exe
Token: SeDebugPrivilege	2400	wmic.exe
Token: SeSystemEnvironmentPrivilege	2400	wmic.exe
Token: SeRemoteShutdownPrivilege	2400	wmic.exe
Token: SeUndockPrivilege	2400	wmic.exe
Token: SeManageVolumePrivilege	2400	wmic.exe
Token: 33	2400	wmic.exe
Token: 34	2400	wmic.exe
Token: 35	2400	wmic.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2532 wrote to memory of 2400	2532	Umbral.exe	30
PID 2532 wrote to memory of 2400	2532	Umbral.exe	30
PID 2532 wrote to memory of 2400	2532	Umbral.exe	30
PID 2532 wrote to memory of 2800	2532	Umbral.exe	33
PID 2532 wrote to memory of 2800	2532	Umbral.exe	33
PID 2532 wrote to memory of 2800	2532	Umbral.exe	33
PID 2532 wrote to memory of 2844	2532	Umbral.exe	35
PID 2532 wrote to memory of 2844	2532	Umbral.exe	35
PID 2532 wrote to memory of 2844	2532	Umbral.exe	35

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2800	attrib.exe

C:\Users\Admin\AppData\Local\Temp\Umbral.exe
"C:\Users\Admin\AppData\Local\Temp\Umbral.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2532
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2400
- C:\Windows\system32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\Umbral.exe"
  2⤵
  - Views/modifies file attributes
  PID:2800
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Umbral.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  PID:2844

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/2532-0-0x000007FEF5413000-0x000007FEF5414000-memory.dmp

Filesize
4KB

Download
memory/2532-1-0x0000000000920000-0x0000000000960000-memory.dmp

Filesize
256KB

Download
memory/2532-2-0x000007FEF5410000-0x000007FEF5DFC000-memory.dmp

Filesize
9.9MB

Download