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

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

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

resource	yara_rule
behavioral1/files/0x000900000001ab4c-5.dat	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

pid	Process
3040	Umbral.exe

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

System Information Discovery
T1082

Suspicious use of AdjustPrivilegeToken 43 IoCs

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

description	pid	Process	procid_target
PID 516 wrote to memory of 3040	516	FIXER-2.3.exe	73
PID 516 wrote to memory of 3040	516	FIXER-2.3.exe	73
PID 516 wrote to memory of 2132	516	FIXER-2.3.exe	74
PID 516 wrote to memory of 2132	516	FIXER-2.3.exe	74
PID 516 wrote to memory of 2132	516	FIXER-2.3.exe	74
PID 3040 wrote to memory of 2228	3040	Umbral.exe	76
PID 3040 wrote to memory of 2228	3040	Umbral.exe	76

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

Replay Monitor

Loading Replay Monitor...

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