umbral | f36f29328d18f9d764b1a9e1e278750d21164ae1c1a25307d018a8e4e17c7c08

Analysis

max time kernel
117s
max time network
120s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
12-02-2024 02:01

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General

Target

idk2.exe
Size

235KB
MD5

de1f5092e62d04690fb1d954f8540116
SHA1

959c0ee9355335d66fa5939dda6d452be32a8a06
SHA256

f36f29328d18f9d764b1a9e1e278750d21164ae1c1a25307d018a8e4e17c7c08
SHA512

2f438cffea72ebb9b089bfba476f4606a92667c154b31c2a6c4153a5ea4aa61620571a4db36a7ed5dffd71cd6edc9250157238b0e8b3a5a53fd27952dd3c2fa6
SSDEEP

6144:qbjntB9rSX4wXTAOU5Mj1af2FUD8bTc5Niydt8k1Mwce6yoN:qbjn1WowBTbTcLFHd1Mwz6t

Score

10^/10

umbral stealer

Malware Config

Extracted

Family

umbral

https://discord.com/api/webhooks/1204944287041847307/aoa_S28cr8V4g11xswAZC9SdvRJS8ygczDK-GfItmMFXCcL2edroJI5lraSE-OISlf6d

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral1/files/0x000a000000012262-2.dat	family_umbral
behavioral1/memory/2404-8-0x0000000000D10000-0x0000000000D50000-memory.dmp	family_umbral

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

Executes dropped EXE 1 IoCs

pid	Process
2404	Umbral.exe

Loads dropped DLL 1 IoCs

pid	Process
3056	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
2052	powershell.exe

Suspicious use of AdjustPrivilegeToken 42 IoCs

description	pid	Process
Token: SeDebugPrivilege	2052	powershell.exe
Token: SeDebugPrivilege	2404	Umbral.exe
Token: SeIncreaseQuotaPrivilege	2364	wmic.exe
Token: SeSecurityPrivilege	2364	wmic.exe
Token: SeTakeOwnershipPrivilege	2364	wmic.exe
Token: SeLoadDriverPrivilege	2364	wmic.exe
Token: SeSystemProfilePrivilege	2364	wmic.exe
Token: SeSystemtimePrivilege	2364	wmic.exe
Token: SeProfSingleProcessPrivilege	2364	wmic.exe
Token: SeIncBasePriorityPrivilege	2364	wmic.exe
Token: SeCreatePagefilePrivilege	2364	wmic.exe
Token: SeBackupPrivilege	2364	wmic.exe
Token: SeRestorePrivilege	2364	wmic.exe
Token: SeShutdownPrivilege	2364	wmic.exe
Token: SeDebugPrivilege	2364	wmic.exe
Token: SeSystemEnvironmentPrivilege	2364	wmic.exe
Token: SeRemoteShutdownPrivilege	2364	wmic.exe
Token: SeUndockPrivilege	2364	wmic.exe
Token: SeManageVolumePrivilege	2364	wmic.exe
Token: 33	2364	wmic.exe
Token: 34	2364	wmic.exe
Token: 35	2364	wmic.exe
Token: SeIncreaseQuotaPrivilege	2364	wmic.exe
Token: SeSecurityPrivilege	2364	wmic.exe
Token: SeTakeOwnershipPrivilege	2364	wmic.exe
Token: SeLoadDriverPrivilege	2364	wmic.exe
Token: SeSystemProfilePrivilege	2364	wmic.exe
Token: SeSystemtimePrivilege	2364	wmic.exe
Token: SeProfSingleProcessPrivilege	2364	wmic.exe
Token: SeIncBasePriorityPrivilege	2364	wmic.exe
Token: SeCreatePagefilePrivilege	2364	wmic.exe
Token: SeBackupPrivilege	2364	wmic.exe
Token: SeRestorePrivilege	2364	wmic.exe
Token: SeShutdownPrivilege	2364	wmic.exe
Token: SeDebugPrivilege	2364	wmic.exe
Token: SeSystemEnvironmentPrivilege	2364	wmic.exe
Token: SeRemoteShutdownPrivilege	2364	wmic.exe
Token: SeUndockPrivilege	2364	wmic.exe
Token: SeManageVolumePrivilege	2364	wmic.exe
Token: 33	2364	wmic.exe
Token: 34	2364	wmic.exe
Token: 35	2364	wmic.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 3056 wrote to memory of 2052	3056	idk2.exe	28
PID 3056 wrote to memory of 2052	3056	idk2.exe	28
PID 3056 wrote to memory of 2052	3056	idk2.exe	28
PID 3056 wrote to memory of 2052	3056	idk2.exe	28
PID 3056 wrote to memory of 2404	3056	idk2.exe	30
PID 3056 wrote to memory of 2404	3056	idk2.exe	30
PID 3056 wrote to memory of 2404	3056	idk2.exe	30
PID 3056 wrote to memory of 2404	3056	idk2.exe	30
PID 2404 wrote to memory of 2364	2404	Umbral.exe	31
PID 2404 wrote to memory of 2364	2404	Umbral.exe	31
PID 2404 wrote to memory of 2364	2404	Umbral.exe	31

C:\Users\Admin\AppData\Local\Temp\idk2.exe
"C:\Users\Admin\AppData\Local\Temp\idk2.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:3056
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "PAAjAGIAcABnACMAPgBBAGQAZAAtAE0AcABQAHIAZQBmAGUAcgBlAG4AYwBlACAAPAAjAHcAZABxACMAPgAgAC0ARQB4AGMAbAB1AHMAaQBvAG4AUABhAHQAaAAgAEAAKAAkAGUAbgB2ADoAVQBzAGUAcgBQAHIAbwBmAGkAbABlACwAJABlAG4AdgA6AFMAeQBzAHQAZQBtAEQAcgBpAHYAZQApACAAPAAjAG0AcgBuACMAPgAgAC0ARgBvAHIAYwBlACAAPAAjAHQAZgBpACMAPgA="
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2052
- C:\Users\Admin\AppData\Local\Temp\Umbral.exe
  "C:\Users\Admin\AppData\Local\Temp\Umbral.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2404
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:2364

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

\Users\Admin\AppData\Local\Temp\Umbral.exe

Filesize
230KB

MD5
c8b5184d9b887d92ab00e72ecb7ec278

SHA1
eb54b2c391556183c63877a988df43633961aa87

SHA256
e1c82e170147a3acbb3fb9cc57bea7d25e0ce2d9c570994ac5a027819c9d5b9f

SHA512
2c2a52c97579efc2df50063bb80280de04fb3e52b1cf20b089f71cb1746e66867dfbbf44e2357c1ce20e3b10b933da4b811cae34052ac4ce95d90419a45e38a9

Download Submit
memory/2052-10-0x0000000073DC0000-0x000000007436B000-memory.dmp

Filesize
5.7MB

Download
memory/2052-11-0x0000000002670000-0x00000000026B0000-memory.dmp

Filesize
256KB

Download
memory/2052-12-0x0000000073DC0000-0x000000007436B000-memory.dmp

Filesize
5.7MB

Download
memory/2052-14-0x0000000073DC0000-0x000000007436B000-memory.dmp

Filesize
5.7MB

Download
memory/2404-8-0x0000000000D10000-0x0000000000D50000-memory.dmp

Filesize
256KB

Download
memory/2404-9-0x000007FEF57A0000-0x000007FEF618C000-memory.dmp

Filesize
9.9MB

Download
memory/2404-13-0x0000000000C90000-0x0000000000D10000-memory.dmp

Filesize
512KB

Download
memory/2404-15-0x000007FEF57A0000-0x000007FEF618C000-memory.dmp

Filesize
9.9MB

Download