umbral | 1ce288b4eace5690b66c6681e77f4f75d1c5fda07eab5a410ffe38271d515909

Analysis

max time kernel
133s
max time network
134s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
05-06-2024 16:18

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General

Target

FIXER-2.3.exe
Size

678KB
MD5

c4a81b5b47dab29d88805f75c95035a0
SHA1

092fcb36a736198e19530c96991d9bcb0354fa75
SHA256

1ce288b4eace5690b66c6681e77f4f75d1c5fda07eab5a410ffe38271d515909
SHA512

eb98f91df470f6f52ad8db2d44da3a090b63d4067e371ca8df1b5e54e7623123d6ba7df779b27cf6298d7778b415e9569f29c62ef6276f8d666134ff4aa7006e
SSDEEP

6144:u4zMHU2N3RSUDqnopqonzuv4NIAyxuQiOfFs3OJ18xNz+KgbqUypit:u44RuS78onzuv4NIAAuQkOzu

Score

10^/10

umbral stealer

Malware Config

Extracted

Family

umbral

https://discordapp.com/api/webhooks/1247657758921330688/6inL47rtBda5FWXQ9j3KkuojoQUQIHytZMOftRLQPHv1vmGRuP44zUd_P2lo-8gb3cBC

Signatures

Detect Umbral payload 2 IoCs

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\Umbral.exe	family_umbral
behavioral1/memory/3040-8-0x000001D7EBBC0000-0x000001D7EBC00000-memory.dmp	family_umbral

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral
Executes dropped EXE 1 IoCs

Processes:

Umbral.exe

pid process

3040 Umbral.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
3040	Umbral.exe

Suspicious use of AdjustPrivilegeToken 43 IoCs

Processes:

Umbral.exewmic.exe

description	pid	process
Token: SeDebugPrivilege	3040	Umbral.exe
Token: SeIncreaseQuotaPrivilege	2228	wmic.exe
Token: SeSecurityPrivilege	2228	wmic.exe
Token: SeTakeOwnershipPrivilege	2228	wmic.exe
Token: SeLoadDriverPrivilege	2228	wmic.exe
Token: SeSystemProfilePrivilege	2228	wmic.exe
Token: SeSystemtimePrivilege	2228	wmic.exe
Token: SeProfSingleProcessPrivilege	2228	wmic.exe
Token: SeIncBasePriorityPrivilege	2228	wmic.exe
Token: SeCreatePagefilePrivilege	2228	wmic.exe
Token: SeBackupPrivilege	2228	wmic.exe
Token: SeRestorePrivilege	2228	wmic.exe
Token: SeShutdownPrivilege	2228	wmic.exe
Token: SeDebugPrivilege	2228	wmic.exe
Token: SeSystemEnvironmentPrivilege	2228	wmic.exe
Token: SeRemoteShutdownPrivilege	2228	wmic.exe
Token: SeUndockPrivilege	2228	wmic.exe
Token: SeManageVolumePrivilege	2228	wmic.exe
Token: 33	2228	wmic.exe
Token: 34	2228	wmic.exe
Token: 35	2228	wmic.exe
Token: 36	2228	wmic.exe
Token: SeIncreaseQuotaPrivilege	2228	wmic.exe
Token: SeSecurityPrivilege	2228	wmic.exe
Token: SeTakeOwnershipPrivilege	2228	wmic.exe
Token: SeLoadDriverPrivilege	2228	wmic.exe
Token: SeSystemProfilePrivilege	2228	wmic.exe
Token: SeSystemtimePrivilege	2228	wmic.exe
Token: SeProfSingleProcessPrivilege	2228	wmic.exe
Token: SeIncBasePriorityPrivilege	2228	wmic.exe
Token: SeCreatePagefilePrivilege	2228	wmic.exe
Token: SeBackupPrivilege	2228	wmic.exe
Token: SeRestorePrivilege	2228	wmic.exe
Token: SeShutdownPrivilege	2228	wmic.exe
Token: SeDebugPrivilege	2228	wmic.exe
Token: SeSystemEnvironmentPrivilege	2228	wmic.exe
Token: SeRemoteShutdownPrivilege	2228	wmic.exe
Token: SeUndockPrivilege	2228	wmic.exe
Token: SeManageVolumePrivilege	2228	wmic.exe
Token: 33	2228	wmic.exe
Token: 34	2228	wmic.exe
Token: 35	2228	wmic.exe
Token: 36	2228	wmic.exe

Suspicious use of WriteProcessMemory 7 IoCs

Processes:

FIXER-2.3.exeUmbral.exe

description	pid	process	target process
PID 516 wrote to memory of 3040	516	FIXER-2.3.exe	Umbral.exe
PID 516 wrote to memory of 3040	516	FIXER-2.3.exe	Umbral.exe
PID 516 wrote to memory of 2132	516	FIXER-2.3.exe	cmd.exe
PID 516 wrote to memory of 2132	516	FIXER-2.3.exe	cmd.exe
PID 516 wrote to memory of 2132	516	FIXER-2.3.exe	cmd.exe
PID 3040 wrote to memory of 2228	3040	Umbral.exe	wmic.exe
PID 3040 wrote to memory of 2228	3040	Umbral.exe	wmic.exe

C:\Users\Admin\AppData\Local\Temp\FIXER-2.3.exe
"C:\Users\Admin\AppData\Local\Temp\FIXER-2.3.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:516

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:3040

C:\Windows\System32\Wbem\wmic.exe
"wmic.exe" csproduct get uuid
3⤵
- Suspicious use of AdjustPrivilegeToken
PID:2228

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\bum.bat" "
2⤵
PID:2132

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:\Users\Admin\AppData\Local\Temp\Umbral.exe
Filesize
231KB

MD5
4726eb272b00df9ffd0274d16aa7c8ae

SHA1
a3c98c19fd956d61f32e0fe214f855e4ac810904

SHA256
7b5df9094a3d6133b309f01585bb2391b4e5e4c7d91737e25399e73053b219ad

SHA512
bd8acb0ab507ac015cb213ec5baed52f60b7144c25e5b32828e8406a7a7264a708708a6149e09e80d83664eadda7381a440305e607c6511e101b51da2f2a110b

Download Submit
C:\Users\Admin\AppData\Local\Temp\bum.bat
Filesize
442KB

MD5
12e75cc92bd7f9350f40745437a75e0f

SHA1
4deead6e14afc6df1afd88e91fd7caa1acf37294

SHA256
0f8ebc8ff32f92408a8d383cceb1e1bc2dc0f0dfe1cffbfe808d82303c98f759

SHA512
c43fdde607adaea7f2d8949dac5db7143553f8ef498f2801180c7cdcd31353dcd80af42ce65677305432bf8e5a59bf0f728b9cb4a69a14bca0e529342f03070d

Download Submit
memory/3040-8-0x000001D7EBBC0000-0x000001D7EBC00000-memory.dmp

Filesize
256KB

Download
memory/3040-9-0x00007FFFE8123000-0x00007FFFE8124000-memory.dmp

Filesize
4KB

Download
memory/3040-11-0x00007FFFE8120000-0x00007FFFE8B0C000-memory.dmp

Filesize
9.9MB

Download
memory/3040-13-0x00007FFFE8120000-0x00007FFFE8B0C000-memory.dmp

Filesize
9.9MB

Download