umbral | 88556497794511dde0ca0a1bfee08922288a620c95a8bc6f67d50dbb81684b22

Analysis

max time kernel
56s
max time network
88s
platform
windows10-2004_x64
resource
win10v2004-20230621-en
resource tags

arch:x64arch:x86image:win10v2004-20230621-enlocale:en-usos:windows10-2004-x64system
submitted
22-06-2023 04:32

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General

Target

wm.exe
Size

3.0MB
MD5

1335a17d311b929988693fb526dc4717
SHA1

062830cb07ce430fe049627e001ef23fba8ba351
SHA256

88556497794511dde0ca0a1bfee08922288a620c95a8bc6f67d50dbb81684b22
SHA512

4a4496ed95c7ff13e8735646a6b8c478742a2f152a3733122fcbac54c0cd7c04571acae789c2ac67dc07d542663290c9e32b3335827e122470d8b887477d7bab
SSDEEP

49152:NguQhMOPX5M+RXNM5428gYbM8gkw0Q4qAew+0Fr95s9e54OyRGEK2+qc2LBhW:6/hMOP2a9MLiVed0Zqe54OCGL2NLPW

Score

10^/10

umbral evasion stealer themida trojan

Malware Config

Extracted

Family

umbral

https://discord.com/api/webhooks/1118163594568286339/M-x5dkJ7qP3mQPZTzttw8LKBX9G63bPw9edrYMRuBg3sffUGWg-W4EW9HaBcdak0-wis

Signatures

Detect Umbral payload 3 IoCs

resource	yara_rule
behavioral2/memory/4528-136-0x0000000000090000-0x00000000008D4000-memory.dmp	family_umbral
behavioral2/memory/4528-137-0x0000000000090000-0x00000000008D4000-memory.dmp	family_umbral
behavioral2/memory/4528-143-0x0000000000090000-0x00000000008D4000-memory.dmp	family_umbral

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

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	wm.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	wm.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	wm.exe

Themida packer 3 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral2/memory/4528-136-0x0000000000090000-0x00000000008D4000-memory.dmp	themida
behavioral2/memory/4528-137-0x0000000000090000-0x00000000008D4000-memory.dmp	themida
behavioral2/memory/4528-143-0x0000000000090000-0x00000000008D4000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	wm.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
4528	wm.exe

Suspicious use of AdjustPrivilegeToken 43 IoCs

description	pid	Process
Token: SeDebugPrivilege	4528	wm.exe
Token: SeIncreaseQuotaPrivilege	1940	wmic.exe
Token: SeSecurityPrivilege	1940	wmic.exe
Token: SeTakeOwnershipPrivilege	1940	wmic.exe
Token: SeLoadDriverPrivilege	1940	wmic.exe
Token: SeSystemProfilePrivilege	1940	wmic.exe
Token: SeSystemtimePrivilege	1940	wmic.exe
Token: SeProfSingleProcessPrivilege	1940	wmic.exe
Token: SeIncBasePriorityPrivilege	1940	wmic.exe
Token: SeCreatePagefilePrivilege	1940	wmic.exe
Token: SeBackupPrivilege	1940	wmic.exe
Token: SeRestorePrivilege	1940	wmic.exe
Token: SeShutdownPrivilege	1940	wmic.exe
Token: SeDebugPrivilege	1940	wmic.exe
Token: SeSystemEnvironmentPrivilege	1940	wmic.exe
Token: SeRemoteShutdownPrivilege	1940	wmic.exe
Token: SeUndockPrivilege	1940	wmic.exe
Token: SeManageVolumePrivilege	1940	wmic.exe
Token: 33	1940	wmic.exe
Token: 34	1940	wmic.exe
Token: 35	1940	wmic.exe
Token: 36	1940	wmic.exe
Token: SeIncreaseQuotaPrivilege	1940	wmic.exe
Token: SeSecurityPrivilege	1940	wmic.exe
Token: SeTakeOwnershipPrivilege	1940	wmic.exe
Token: SeLoadDriverPrivilege	1940	wmic.exe
Token: SeSystemProfilePrivilege	1940	wmic.exe
Token: SeSystemtimePrivilege	1940	wmic.exe
Token: SeProfSingleProcessPrivilege	1940	wmic.exe
Token: SeIncBasePriorityPrivilege	1940	wmic.exe
Token: SeCreatePagefilePrivilege	1940	wmic.exe
Token: SeBackupPrivilege	1940	wmic.exe
Token: SeRestorePrivilege	1940	wmic.exe
Token: SeShutdownPrivilege	1940	wmic.exe
Token: SeDebugPrivilege	1940	wmic.exe
Token: SeSystemEnvironmentPrivilege	1940	wmic.exe
Token: SeRemoteShutdownPrivilege	1940	wmic.exe
Token: SeUndockPrivilege	1940	wmic.exe
Token: SeManageVolumePrivilege	1940	wmic.exe
Token: 33	1940	wmic.exe
Token: 34	1940	wmic.exe
Token: 35	1940	wmic.exe
Token: 36	1940	wmic.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4528 wrote to memory of 1940	4528	wm.exe	78
PID 4528 wrote to memory of 1940	4528	wm.exe	78
PID 4528 wrote to memory of 1940	4528	wm.exe	78

C:\Users\Admin\AppData\Local\Temp\wm.exe
"C:\Users\Admin\AppData\Local\Temp\wm.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4528
- C:\Windows\SysWOW64\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1940

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/4528-133-0x0000000000090000-0x00000000008D4000-memory.dmp

Filesize
8.3MB

Download
memory/4528-136-0x0000000000090000-0x00000000008D4000-memory.dmp

Filesize
8.3MB

Download
memory/4528-137-0x0000000000090000-0x00000000008D4000-memory.dmp

Filesize
8.3MB

Download
memory/4528-138-0x0000000005460000-0x00000000054F2000-memory.dmp

Filesize
584KB

Download
memory/4528-139-0x0000000005AB0000-0x0000000006054000-memory.dmp

Filesize
5.6MB

Download
memory/4528-140-0x00000000055D0000-0x00000000055E0000-memory.dmp

Filesize
64KB

Download
memory/4528-143-0x0000000000090000-0x00000000008D4000-memory.dmp

Filesize
8.3MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads