umbral | e00d8a4b001935fb2c6cbedf9300e364ed6bdfd29158e04dbdedb018c4a6878a

Analysis

max time kernel
138s
max time network
158s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
15-02-2024 20:16

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General

Target

CheatCheck.exe
Size

1.9MB
MD5

f5180bd1bede58236ddd37276403c888
SHA1

919b6b47635e81a1f0f2637f89902fc9563387cd
SHA256

e00d8a4b001935fb2c6cbedf9300e364ed6bdfd29158e04dbdedb018c4a6878a
SHA512

cebec5ea8762f1aaee9884a46d3cf7d7d138dfc25240f5da1216cdcfdc32d0f5f47b677674837b178735eec2794227c7af7a85352501e8387fa7e06c7d1a6244
SSDEEP

49152:62YU+sjELQXoeysHa6/3pKJz6lRusCofRVg6PJuL68l:62JT5G6/pKocsC6geJuG

Score

10^/10

umbral evasion stealer

Malware Config

Extracted

Family

umbral

https://discordapp.com/api/webhooks/1205950589855473715/yMBp6zJGAY_8GNy4KCuGaBheW78ZyPBH6wBshmsyIHWe3bpwN-cogn3qrbzWQQLDF5nC

Signatures

Detect Umbral payload 3 IoCs

resource	yara_rule
behavioral2/memory/4528-3-0x00000000001F0000-0x00000000006B4000-memory.dmp	family_umbral
behavioral2/memory/4528-4-0x00000000001F0000-0x00000000006B4000-memory.dmp	family_umbral
behavioral2/memory/4528-10-0x00000000001F0000-0x00000000006B4000-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__	CheatCheck.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	CheatCheck.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	CheatCheck.exe

Identifies Wine through registry keys 2 TTPs 1 IoCs

Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3073191680-435865314-2862784915-1000\Software\Wine	CheatCheck.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
4528	CheatCheck.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4528	CheatCheck.exe
4528	CheatCheck.exe

Suspicious use of AdjustPrivilegeToken 43 IoCs

description	pid	Process
Token: SeDebugPrivilege	4528	CheatCheck.exe
Token: SeIncreaseQuotaPrivilege	1800	wmic.exe
Token: SeSecurityPrivilege	1800	wmic.exe
Token: SeTakeOwnershipPrivilege	1800	wmic.exe
Token: SeLoadDriverPrivilege	1800	wmic.exe
Token: SeSystemProfilePrivilege	1800	wmic.exe
Token: SeSystemtimePrivilege	1800	wmic.exe
Token: SeProfSingleProcessPrivilege	1800	wmic.exe
Token: SeIncBasePriorityPrivilege	1800	wmic.exe
Token: SeCreatePagefilePrivilege	1800	wmic.exe
Token: SeBackupPrivilege	1800	wmic.exe
Token: SeRestorePrivilege	1800	wmic.exe
Token: SeShutdownPrivilege	1800	wmic.exe
Token: SeDebugPrivilege	1800	wmic.exe
Token: SeSystemEnvironmentPrivilege	1800	wmic.exe
Token: SeRemoteShutdownPrivilege	1800	wmic.exe
Token: SeUndockPrivilege	1800	wmic.exe
Token: SeManageVolumePrivilege	1800	wmic.exe
Token: 33	1800	wmic.exe
Token: 34	1800	wmic.exe
Token: 35	1800	wmic.exe
Token: 36	1800	wmic.exe
Token: SeIncreaseQuotaPrivilege	1800	wmic.exe
Token: SeSecurityPrivilege	1800	wmic.exe
Token: SeTakeOwnershipPrivilege	1800	wmic.exe
Token: SeLoadDriverPrivilege	1800	wmic.exe
Token: SeSystemProfilePrivilege	1800	wmic.exe
Token: SeSystemtimePrivilege	1800	wmic.exe
Token: SeProfSingleProcessPrivilege	1800	wmic.exe
Token: SeIncBasePriorityPrivilege	1800	wmic.exe
Token: SeCreatePagefilePrivilege	1800	wmic.exe
Token: SeBackupPrivilege	1800	wmic.exe
Token: SeRestorePrivilege	1800	wmic.exe
Token: SeShutdownPrivilege	1800	wmic.exe
Token: SeDebugPrivilege	1800	wmic.exe
Token: SeSystemEnvironmentPrivilege	1800	wmic.exe
Token: SeRemoteShutdownPrivilege	1800	wmic.exe
Token: SeUndockPrivilege	1800	wmic.exe
Token: SeManageVolumePrivilege	1800	wmic.exe
Token: 33	1800	wmic.exe
Token: 34	1800	wmic.exe
Token: 35	1800	wmic.exe
Token: 36	1800	wmic.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4528 wrote to memory of 1800	4528	CheatCheck.exe	84
PID 4528 wrote to memory of 1800	4528	CheatCheck.exe	84
PID 4528 wrote to memory of 1800	4528	CheatCheck.exe	84

C:\Users\Admin\AppData\Local\Temp\CheatCheck.exe
"C:\Users\Admin\AppData\Local\Temp\CheatCheck.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- 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:1800

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

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/4528-0-0x00000000001F0000-0x00000000006B4000-memory.dmp

Filesize
4.8MB

Download
memory/4528-1-0x00000000773B4000-0x00000000773B6000-memory.dmp

Filesize
8KB

Download
memory/4528-2-0x00000000741A0000-0x0000000074950000-memory.dmp

Filesize
7.7MB

Download
memory/4528-3-0x00000000001F0000-0x00000000006B4000-memory.dmp

Filesize
4.8MB

Download
memory/4528-4-0x00000000001F0000-0x00000000006B4000-memory.dmp

Filesize
4.8MB

Download
memory/4528-5-0x00000000070F0000-0x0000000007182000-memory.dmp

Filesize
584KB

Download
memory/4528-6-0x0000000007740000-0x0000000007CE4000-memory.dmp

Filesize
5.6MB

Download
memory/4528-10-0x00000000001F0000-0x00000000006B4000-memory.dmp

Filesize
4.8MB

Download
memory/4528-11-0x00000000741A0000-0x0000000074950000-memory.dmp

Filesize
7.7MB

Download