umbral | dbe484df5c3d55bed8b6a40b64ca3a1795d2c8aca6205608d21d5472ade4165e

Analysis

max time kernel
131s
max time network
140s
platform
windows10-1703_x64
resource
win10-20240221-en
resource tags

arch:x64arch:x86image:win10-20240221-enlocale:en-usos:windows10-1703-x64system
submitted
29-02-2024 14:59

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General

Target

Impact.exe
Size

6.3MB
MD5

5016a909cca6b4aa3be2ca91413d6ab9
SHA1

de7c31eb75b193b814f06644683ae5d577318414
SHA256

dbe484df5c3d55bed8b6a40b64ca3a1795d2c8aca6205608d21d5472ade4165e
SHA512

086d0df5d5b24609d4948bfacac11bfa1b89393cf754807af8fc28d79835b506e3969e2859edf3fd2c3cb764ea5efb32857f1efbf35400d39efa05e8713b9e2c
SSDEEP

98304:IB38757d1xzB92ETr/SG/e6ML0kySVPziZ42xBTBcSn7JNXjEFsZg53B:Gs7D1xH3/SG/KL0fSNmZ9xhBj7zzes6X

Score

10^/10

umbral stealer

Malware Config

Extracted

Family

umbral

https://discord.com/api/webhooks/1212027959540457552/KZYDUhyrYD0YKoaYSriiRB70eS31tcZwPEG7XxhVIMPDkD1TJ9jRjQvtazcExm8q18DW

Signatures

Detect Umbral payload 3 IoCs

resource	yara_rule
behavioral1/files/0x000900000001aaa8-3.dat	family_umbral
behavioral1/memory/4940-6-0x0000021244A60000-0x0000021244AA0000-memory.dmp	family_umbral
behavioral1/memory/3708-5-0x0000000000400000-0x0000000000A54000-memory.dmp	family_umbral

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

Executes dropped EXE 1 IoCs

pid	Process
4940	Saransk.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\rescache\_merged\1601268389\3877292338.pri	taskmgr.exe
File created	C:\Windows\rescache\_merged\4183903823\810424605.pri	taskmgr.exe

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

System Information Discovery
T1082

Checks SCSI registry key(s) 3 TTPs 3 IoCs

SCSI information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\Properties\{b725f130-47ef-101a-a5f1-02608c9eebac}\000A	taskmgr.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\FriendlyName	taskmgr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000	taskmgr.exe

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	taskmgr.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	taskmgr.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe

Suspicious use of AdjustPrivilegeToken 48 IoCs

description	pid	Process
Token: SeDebugPrivilege	4940	Saransk.exe
Token: SeIncreaseQuotaPrivilege	2892	wmic.exe
Token: SeSecurityPrivilege	2892	wmic.exe
Token: SeTakeOwnershipPrivilege	2892	wmic.exe
Token: SeLoadDriverPrivilege	2892	wmic.exe
Token: SeSystemProfilePrivilege	2892	wmic.exe
Token: SeSystemtimePrivilege	2892	wmic.exe
Token: SeProfSingleProcessPrivilege	2892	wmic.exe
Token: SeIncBasePriorityPrivilege	2892	wmic.exe
Token: SeCreatePagefilePrivilege	2892	wmic.exe
Token: SeBackupPrivilege	2892	wmic.exe
Token: SeRestorePrivilege	2892	wmic.exe
Token: SeShutdownPrivilege	2892	wmic.exe
Token: SeDebugPrivilege	2892	wmic.exe
Token: SeSystemEnvironmentPrivilege	2892	wmic.exe
Token: SeRemoteShutdownPrivilege	2892	wmic.exe
Token: SeUndockPrivilege	2892	wmic.exe
Token: SeManageVolumePrivilege	2892	wmic.exe
Token: 33	2892	wmic.exe
Token: 34	2892	wmic.exe
Token: 35	2892	wmic.exe
Token: 36	2892	wmic.exe
Token: SeIncreaseQuotaPrivilege	2892	wmic.exe
Token: SeSecurityPrivilege	2892	wmic.exe
Token: SeTakeOwnershipPrivilege	2892	wmic.exe
Token: SeLoadDriverPrivilege	2892	wmic.exe
Token: SeSystemProfilePrivilege	2892	wmic.exe
Token: SeSystemtimePrivilege	2892	wmic.exe
Token: SeProfSingleProcessPrivilege	2892	wmic.exe
Token: SeIncBasePriorityPrivilege	2892	wmic.exe
Token: SeCreatePagefilePrivilege	2892	wmic.exe
Token: SeBackupPrivilege	2892	wmic.exe
Token: SeRestorePrivilege	2892	wmic.exe
Token: SeShutdownPrivilege	2892	wmic.exe
Token: SeDebugPrivilege	2892	wmic.exe
Token: SeSystemEnvironmentPrivilege	2892	wmic.exe
Token: SeRemoteShutdownPrivilege	2892	wmic.exe
Token: SeUndockPrivilege	2892	wmic.exe
Token: SeManageVolumePrivilege	2892	wmic.exe
Token: 33	2892	wmic.exe
Token: 34	2892	wmic.exe
Token: 35	2892	wmic.exe
Token: 36	2892	wmic.exe
Token: SeDebugPrivilege	4828	taskmgr.exe
Token: SeSystemProfilePrivilege	4828	taskmgr.exe
Token: SeCreateGlobalPrivilege	4828	taskmgr.exe
Token: 33	4828	taskmgr.exe
Token: SeIncBasePriorityPrivilege	4828	taskmgr.exe

Suspicious use of FindShellTrayWindow 35 IoCs

pid	Process
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe

Suspicious use of SendNotifyMessage 35 IoCs

pid	Process
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe
4828	taskmgr.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3708 wrote to memory of 4940	3708	Impact.exe	73
PID 3708 wrote to memory of 4940	3708	Impact.exe	73
PID 4940 wrote to memory of 2892	4940	Saransk.exe	74
PID 4940 wrote to memory of 2892	4940	Saransk.exe	74

C:\Users\Admin\AppData\Local\Temp\Impact.exe
"C:\Users\Admin\AppData\Local\Temp\Impact.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3708
- C:\Users\Admin\AppData\Local\Temp\Saransk.exe
  "C:\Users\Admin\AppData\Local\Temp\Saransk.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4940
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:2892

C:\Windows\system32\taskmgr.exe
"C:\Windows\system32\taskmgr.exe" /7
1⤵
- Drops file in Windows directory
- Checks SCSI registry key(s)
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
PID:4828

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Peripheral Device Discovery

T1120

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\Saransk.exe

Filesize
231KB

MD5
cfff8715abce162a4c2ea732b32976c2

SHA1
cd7ae0bc75abb2a311edfdb978be74625cbb956d

SHA256
0bd085ac75679b2d2f0f78574916cba674346d581e6f7ff95887220a90f4feef

SHA512
05c3868fabbb19f6531b067e9450b5ace162966f0cbe5a5855db4026906e4b86f70c7385fbb2ad704b6ebc04185ec480d28aacdb29bf51561b19ed1573361122

Download Submit
memory/3708-5-0x0000000000400000-0x0000000000A54000-memory.dmp

Filesize
6.3MB

Download
memory/4940-6-0x0000021244A60000-0x0000021244AA0000-memory.dmp

Filesize
256KB

Download
memory/4940-7-0x00007FFE108C0000-0x00007FFE112AC000-memory.dmp

Filesize
9.9MB

Download
memory/4940-8-0x000002125EFB0000-0x000002125EFC0000-memory.dmp

Filesize
64KB

Download
memory/4940-10-0x00007FFE108C0000-0x00007FFE112AC000-memory.dmp

Filesize
9.9MB

Download