umbral | 36399eb1f9e05f38e756936ba09df8d1abe65a6b57204f01ffc607590f43a6c8

Analysis

max time kernel
163s
max time network
198s
platform
windows11-21h2_x64
resource
win11-20231222-en
resource tags

arch:x64arch:x86image:win11-20231222-enlocale:en-usos:windows11-21h2-x64system
submitted
04-01-2024 17:06

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General

Target

lazedebugobf.rar
Size

81KB
MD5

cb595ccd6ed603a941fdcfea3e02c28f
SHA1

7a837f13827677113816d0c91ecd3c05c493a150
SHA256

36399eb1f9e05f38e756936ba09df8d1abe65a6b57204f01ffc607590f43a6c8
SHA512

cf970e14b070370dd3b9ccc9bae831d9d2cf1298439ccff80698196eb28faef47d2ae7a13f228ed73f4c9533f295776f0fb9733a23b4bd2b033e8f483cd89c6b
SSDEEP

1536:6UbxlxLvxNhKwOHj4FrcUA9uhh3XRNgv65YlA1i3+fOkJPyuWiaKOHJG2s:tbTNhKhHMr3iuhhnRKN+C+ftauTaKOoH

Score

10^/10

umbral stealer

Malware Config

Extracted

Family

umbral

https://discord.com/api/webhooks/1005024150882099240/khYBJOc4FQNJuv-BvZjBBTykGgJUimQ5GLYiEAUjKfqFwzv4plf4HvRFL0bMjUAAW-6N

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral1/memory/2684-4-0x000002C0035D0000-0x000002C003610000-memory.dmp	family_umbral
behavioral1/files/0x000200000002a7fd-9.dat	family_umbral

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

Executes dropped EXE 2 IoCs

pid	Process
2684	laze_obf019593.exe
796	laze_obf019593.exe

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-4286256601-2211319207-2237621277-1000_Classes\Local Settings	cmd.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1680	7zFM.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeRestorePrivilege	1680	7zFM.exe
Token: 35	1680	7zFM.exe
Token: SeSecurityPrivilege	1680	7zFM.exe
Token: SeDebugPrivilege	2684	laze_obf019593.exe
Token: SeIncreaseQuotaPrivilege	4764	wmic.exe
Token: SeSecurityPrivilege	4764	wmic.exe
Token: SeTakeOwnershipPrivilege	4764	wmic.exe
Token: SeLoadDriverPrivilege	4764	wmic.exe
Token: SeSystemProfilePrivilege	4764	wmic.exe
Token: SeSystemtimePrivilege	4764	wmic.exe
Token: SeProfSingleProcessPrivilege	4764	wmic.exe
Token: SeIncBasePriorityPrivilege	4764	wmic.exe
Token: SeCreatePagefilePrivilege	4764	wmic.exe
Token: SeBackupPrivilege	4764	wmic.exe
Token: SeRestorePrivilege	4764	wmic.exe
Token: SeShutdownPrivilege	4764	wmic.exe
Token: SeDebugPrivilege	4764	wmic.exe
Token: SeSystemEnvironmentPrivilege	4764	wmic.exe
Token: SeRemoteShutdownPrivilege	4764	wmic.exe
Token: SeUndockPrivilege	4764	wmic.exe
Token: SeManageVolumePrivilege	4764	wmic.exe
Token: 33	4764	wmic.exe
Token: 34	4764	wmic.exe
Token: 35	4764	wmic.exe
Token: 36	4764	wmic.exe
Token: SeIncreaseQuotaPrivilege	4764	wmic.exe
Token: SeSecurityPrivilege	4764	wmic.exe
Token: SeTakeOwnershipPrivilege	4764	wmic.exe
Token: SeLoadDriverPrivilege	4764	wmic.exe
Token: SeSystemProfilePrivilege	4764	wmic.exe
Token: SeSystemtimePrivilege	4764	wmic.exe
Token: SeProfSingleProcessPrivilege	4764	wmic.exe
Token: SeIncBasePriorityPrivilege	4764	wmic.exe
Token: SeCreatePagefilePrivilege	4764	wmic.exe
Token: SeBackupPrivilege	4764	wmic.exe
Token: SeRestorePrivilege	4764	wmic.exe
Token: SeShutdownPrivilege	4764	wmic.exe
Token: SeDebugPrivilege	4764	wmic.exe
Token: SeSystemEnvironmentPrivilege	4764	wmic.exe
Token: SeRemoteShutdownPrivilege	4764	wmic.exe
Token: SeUndockPrivilege	4764	wmic.exe
Token: SeManageVolumePrivilege	4764	wmic.exe
Token: 33	4764	wmic.exe
Token: 34	4764	wmic.exe
Token: 35	4764	wmic.exe
Token: 36	4764	wmic.exe
Token: SeDebugPrivilege	796	laze_obf019593.exe
Token: SeIncreaseQuotaPrivilege	2600	wmic.exe
Token: SeSecurityPrivilege	2600	wmic.exe
Token: SeTakeOwnershipPrivilege	2600	wmic.exe
Token: SeLoadDriverPrivilege	2600	wmic.exe
Token: SeSystemProfilePrivilege	2600	wmic.exe
Token: SeSystemtimePrivilege	2600	wmic.exe
Token: SeProfSingleProcessPrivilege	2600	wmic.exe
Token: SeIncBasePriorityPrivilege	2600	wmic.exe
Token: SeCreatePagefilePrivilege	2600	wmic.exe
Token: SeBackupPrivilege	2600	wmic.exe
Token: SeRestorePrivilege	2600	wmic.exe
Token: SeShutdownPrivilege	2600	wmic.exe
Token: SeDebugPrivilege	2600	wmic.exe
Token: SeSystemEnvironmentPrivilege	2600	wmic.exe
Token: SeRemoteShutdownPrivilege	2600	wmic.exe
Token: SeUndockPrivilege	2600	wmic.exe
Token: SeManageVolumePrivilege	2600	wmic.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
1680	7zFM.exe
1680	7zFM.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2740 wrote to memory of 1680	2740	cmd.exe	19
PID 2740 wrote to memory of 1680	2740	cmd.exe	19
PID 2684 wrote to memory of 4764	2684	laze_obf019593.exe	89
PID 2684 wrote to memory of 4764	2684	laze_obf019593.exe	89
PID 796 wrote to memory of 2600	796	laze_obf019593.exe	93
PID 796 wrote to memory of 2600	796	laze_obf019593.exe	93

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\lazedebugobf.rar
1⤵
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:2740
- C:\Program Files\7-Zip\7zFM.exe
  "C:\Program Files\7-Zip\7zFM.exe" "C:\Users\Admin\AppData\Local\Temp\lazedebugobf.rar"
  2⤵
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  PID:1680

C:\Users\Admin\Desktop\laze_obf019593.exe
"C:\Users\Admin\Desktop\laze_obf019593.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2684
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4764

C:\Users\Admin\Desktop\laze_obf019593.exe
"C:\Users\Admin\Desktop\laze_obf019593.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:796
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2600

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\Microsoft\CLR_v4.0\UsageLogs\laze_obf019593.exe.log

Filesize
1KB

MD5
02df789e3c730b309fc4d9abce5d729b

SHA1
4f9da0f0d4cadacfd0f68fb1f7ee73a66dcf1b4e

SHA256
4afabcd1723096359d90c8f32df7a6a44cd866e89d5b37c89280bfeab61d7321

SHA512
7ac0dd7e3a3e483d07409da793dd2b0915d4369fe41fe743acd82de9aa77b9fa7ea5cd60498034f3fa0674d93d184c9128375d8f7f0796fddecff3845fca8587

Download Submit
C:\Users\Admin\Desktop\laze_obf019593.exe

Filesize
230KB

MD5
17a06509725aa934b928ad0848c1103c

SHA1
494a6da76c9a4c9472367bc8192ebdd3a3d46195

SHA256
9913b7ebda2313d87b11781c88757ac209a0b29af7c4559b63c21a04f71ccc70

SHA512
6c24152c258a7da3381276ac07525f691f24cad7925fdf82d94841b511a9a5e704c893267214da59ba41a48f8f5a056789fcfba1b28731e1dbd7a3c20347be8d

Download Submit
memory/796-12-0x000001B3B49E0000-0x000001B3B49F0000-memory.dmp

Filesize
64KB

Download
memory/796-11-0x00007FFF05ED0000-0x00007FFF06992000-memory.dmp

Filesize
10.8MB

Download
memory/796-13-0x00007FFF05ED0000-0x00007FFF06992000-memory.dmp

Filesize
10.8MB

Download
memory/2684-4-0x000002C0035D0000-0x000002C003610000-memory.dmp

Filesize
256KB

Download
memory/2684-5-0x00007FFF05ED0000-0x00007FFF06992000-memory.dmp

Filesize
10.8MB

Download
memory/2684-6-0x000002C005370000-0x000002C005380000-memory.dmp

Filesize
64KB

Download
memory/2684-8-0x00007FFF05ED0000-0x00007FFF06992000-memory.dmp

Filesize
10.8MB

Download