umbral | 8d612921eca9c96803b1057e860d2d3236869bd3658b01fb7f3402134bd0300c

Analysis

max time kernel
118s
max time network
118s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
29/02/2024, 03:55

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General

Target

idk2.exe
Size

235KB
MD5

ce4b4e4821aba2f7ea9aad57e60f9c3c
SHA1

1f01a2d44d06ced9373687ae061f81540fa1c015
SHA256

8d612921eca9c96803b1057e860d2d3236869bd3658b01fb7f3402134bd0300c
SHA512

727a3cc82dfdaede3fdcab6bd1a52794e90e3a41560345cc82212aaf75a00a09d63c753cf23b5318ad5b58126f29696bc4fbffac4f9ea1eee0af195712dae085
SSDEEP

6144:waeJtRSyn/TlQ1VFmqGF3+re5d0KkJ4tWDwp:wNPT/xAVPWUG0KkrD

Score

10^/10

umbral stealer

Malware Config

Extracted

Family

umbral

https://discord.com/api/webhooks/1205352570537775114/0TwopxZF8mZAIjdEowRHAiTqFbB8pjE6dzR2ST_E7pX5YXnZRcMh5QKMfo2QE94dAXKK

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral1/files/0x000b000000012256-3.dat	family_umbral
behavioral1/memory/1664-7-0x0000000000830000-0x0000000000870000-memory.dmp	family_umbral

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

Executes dropped EXE 1 IoCs

pid	Process
1664	Umbral.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File created	C:\Windows\Umbral.exe	idk2.exe

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1004	powershell.exe

Suspicious use of AdjustPrivilegeToken 42 IoCs

description	pid	Process
Token: SeDebugPrivilege	1004	powershell.exe
Token: SeDebugPrivilege	1664	Umbral.exe
Token: SeIncreaseQuotaPrivilege	2700	wmic.exe
Token: SeSecurityPrivilege	2700	wmic.exe
Token: SeTakeOwnershipPrivilege	2700	wmic.exe
Token: SeLoadDriverPrivilege	2700	wmic.exe
Token: SeSystemProfilePrivilege	2700	wmic.exe
Token: SeSystemtimePrivilege	2700	wmic.exe
Token: SeProfSingleProcessPrivilege	2700	wmic.exe
Token: SeIncBasePriorityPrivilege	2700	wmic.exe
Token: SeCreatePagefilePrivilege	2700	wmic.exe
Token: SeBackupPrivilege	2700	wmic.exe
Token: SeRestorePrivilege	2700	wmic.exe
Token: SeShutdownPrivilege	2700	wmic.exe
Token: SeDebugPrivilege	2700	wmic.exe
Token: SeSystemEnvironmentPrivilege	2700	wmic.exe
Token: SeRemoteShutdownPrivilege	2700	wmic.exe
Token: SeUndockPrivilege	2700	wmic.exe
Token: SeManageVolumePrivilege	2700	wmic.exe
Token: 33	2700	wmic.exe
Token: 34	2700	wmic.exe
Token: 35	2700	wmic.exe
Token: SeIncreaseQuotaPrivilege	2700	wmic.exe
Token: SeSecurityPrivilege	2700	wmic.exe
Token: SeTakeOwnershipPrivilege	2700	wmic.exe
Token: SeLoadDriverPrivilege	2700	wmic.exe
Token: SeSystemProfilePrivilege	2700	wmic.exe
Token: SeSystemtimePrivilege	2700	wmic.exe
Token: SeProfSingleProcessPrivilege	2700	wmic.exe
Token: SeIncBasePriorityPrivilege	2700	wmic.exe
Token: SeCreatePagefilePrivilege	2700	wmic.exe
Token: SeBackupPrivilege	2700	wmic.exe
Token: SeRestorePrivilege	2700	wmic.exe
Token: SeShutdownPrivilege	2700	wmic.exe
Token: SeDebugPrivilege	2700	wmic.exe
Token: SeSystemEnvironmentPrivilege	2700	wmic.exe
Token: SeRemoteShutdownPrivilege	2700	wmic.exe
Token: SeUndockPrivilege	2700	wmic.exe
Token: SeManageVolumePrivilege	2700	wmic.exe
Token: 33	2700	wmic.exe
Token: 34	2700	wmic.exe
Token: 35	2700	wmic.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 1032 wrote to memory of 1004	1032	idk2.exe	28
PID 1032 wrote to memory of 1004	1032	idk2.exe	28
PID 1032 wrote to memory of 1004	1032	idk2.exe	28
PID 1032 wrote to memory of 1004	1032	idk2.exe	28
PID 1032 wrote to memory of 1664	1032	idk2.exe	30
PID 1032 wrote to memory of 1664	1032	idk2.exe	30
PID 1032 wrote to memory of 1664	1032	idk2.exe	30
PID 1032 wrote to memory of 1664	1032	idk2.exe	30
PID 1664 wrote to memory of 2700	1664	Umbral.exe	31
PID 1664 wrote to memory of 2700	1664	Umbral.exe	31
PID 1664 wrote to memory of 2700	1664	Umbral.exe	31

C:\Users\Admin\AppData\Local\Temp\idk2.exe
"C:\Users\Admin\AppData\Local\Temp\idk2.exe"
1⤵
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:1032
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "PAAjAGQAYwBhACMAPgBBAGQAZAAtAE0AcABQAHIAZQBmAGUAcgBlAG4AYwBlACAAPAAjAHoAbABmACMAPgAgAC0ARQB4AGMAbAB1AHMAaQBvAG4AUABhAHQAaAAgAEAAKAAkAGUAbgB2ADoAVQBzAGUAcgBQAHIAbwBmAGkAbABlACwAJABlAG4AdgA6AFMAeQBzAHQAZQBtAEQAcgBpAHYAZQApACAAPAAjAHYAbQBnACMAPgAgAC0ARgBvAHIAYwBlACAAPAAjAHcAeQBzACMAPgA="
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1004
- C:\Windows\Umbral.exe
  "C:\Windows\Umbral.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1664
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:2700

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\Umbral.exe

Filesize
230KB

MD5
e57355d016f869b612bb5512bc9929da

SHA1
8d49a140dbe7ef50a1052bbb90514f84ff211daa

SHA256
516a9e91fdd13f05c4a8df291b9d2bb1571d5ce6223b883a6cae345cf0e75643

SHA512
4191df273c90a6e950bbae1931abe8d9e735ab9ff947fe0331664dcf8b96fdc50bb3436761d4e5ce190afd8a503ccad0fe2eb211b6af8a63aa6c6ae1bb7aee19

Download Submit
memory/1004-9-0x0000000074390000-0x000000007493B000-memory.dmp

Filesize
5.7MB

Download
memory/1004-10-0x0000000002CF0000-0x0000000002D30000-memory.dmp

Filesize
256KB

Download
memory/1004-11-0x0000000002CF0000-0x0000000002D30000-memory.dmp

Filesize
256KB

Download
memory/1004-12-0x0000000074390000-0x000000007493B000-memory.dmp

Filesize
5.7MB

Download
memory/1664-7-0x0000000000830000-0x0000000000870000-memory.dmp

Filesize
256KB

Download
memory/1664-8-0x000007FEF5D70000-0x000007FEF675C000-memory.dmp

Filesize
9.9MB

Download
memory/1664-13-0x000007FEF5D70000-0x000007FEF675C000-memory.dmp

Filesize
9.9MB

Download