umbral | 788cf3cb6aaba23ae7735a80b0ac34ea62ccdac8851b94ad0a185137c2b72297

General

Target

nvngx_dlss.dll
Size

5.8MB
MD5

8de5c0e5b2257874f05b2dbca186dc6a
SHA1

1e76d52f66d37e804a6c0b93e242fcf2a402705c
SHA256

788cf3cb6aaba23ae7735a80b0ac34ea62ccdac8851b94ad0a185137c2b72297
SHA512

75e5724ed2b28e1294a042a05c082346be5a1186f6a8547ba5b9ddd623c5a37872f36c637833133fa88d00e237fffaa619c35976bed558cd66f32b4c153026f5
SSDEEP

98304:Es2V9unkmnmFZZb5U39X0VFCb5cFUH+MRKqzFRShhDzij5IZdaaaU4ksdW80t/5:E9unjnu/beiQMU15UhNej5IsUOdWD15

Score

10^/10

umbral evasion stealer themida trojan

Malware Config

Signatures

Detect Umbral payload 2 IoCs

Processes:

resource	yara_rule
C:\Windows\SoftwareDistribution\nvsvc64.exe	family_umbral
behavioral1/memory/2920-21-0x00000193D61B0000-0x00000193D61F0000-memory.dmp	family_umbral

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral
Umbral family
umbral
Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Processes:

rundll32.exe

description ioc process

Key opened \REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__ rundll32.exe
Blocklisted process makes network request 2 IoCs

Processes:

rundll32.exe

flow pid process

10 4864 rundll32.exe
14 4864 rundll32.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	rundll32.exe

flow	pid	process
10	4864	rundll32.exe
14	4864	rundll32.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

Processes:

rundll32.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	rundll32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	rundll32.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

rundll32.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	rundll32.exe

Executes dropped EXE 1 IoCs

Processes:

nvsvc64.exe

pid process

2920 nvsvc64.exe

pid	process
2920	nvsvc64.exe

Themida packer 2 IoCs

Detects Themida, an advanced Windows software protection system.

themida

Processes:

resource	yara_rule
behavioral1/memory/4864-0-0x0000000180000000-0x0000000180EA8000-memory.dmp	themida
behavioral1/memory/4864-2-0x0000000180000000-0x0000000180EA8000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs
evasion trojan

System Information Discovery
T1082

Processes:

rundll32.exe

description ioc process

Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA rundll32.exe
Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

26 ip-api.com
Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

Processes:

rundll32.exe

pid process

4864 rundll32.exe
Drops file in Windows directory 1 IoCs

Processes:

rundll32.exe

description ioc process

File created C:\Windows\SoftwareDistribution\nvsvc64.exe rundll32.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	rundll32.exe

flow	ioc
26	ip-api.com

pid	process
4864	rundll32.exe

description	ioc	process
File created	C:\Windows\SoftwareDistribution\nvsvc64.exe	rundll32.exe

Suspicious use of AdjustPrivilegeToken 43 IoCs

Processes:

nvsvc64.exewmic.exe

description	pid	process
Token: SeDebugPrivilege	2920	nvsvc64.exe
Token: SeIncreaseQuotaPrivilege	4684	wmic.exe
Token: SeSecurityPrivilege	4684	wmic.exe
Token: SeTakeOwnershipPrivilege	4684	wmic.exe
Token: SeLoadDriverPrivilege	4684	wmic.exe
Token: SeSystemProfilePrivilege	4684	wmic.exe
Token: SeSystemtimePrivilege	4684	wmic.exe
Token: SeProfSingleProcessPrivilege	4684	wmic.exe
Token: SeIncBasePriorityPrivilege	4684	wmic.exe
Token: SeCreatePagefilePrivilege	4684	wmic.exe
Token: SeBackupPrivilege	4684	wmic.exe
Token: SeRestorePrivilege	4684	wmic.exe
Token: SeShutdownPrivilege	4684	wmic.exe
Token: SeDebugPrivilege	4684	wmic.exe
Token: SeSystemEnvironmentPrivilege	4684	wmic.exe
Token: SeRemoteShutdownPrivilege	4684	wmic.exe
Token: SeUndockPrivilege	4684	wmic.exe
Token: SeManageVolumePrivilege	4684	wmic.exe
Token: 33	4684	wmic.exe
Token: 34	4684	wmic.exe
Token: 35	4684	wmic.exe
Token: 36	4684	wmic.exe
Token: SeIncreaseQuotaPrivilege	4684	wmic.exe
Token: SeSecurityPrivilege	4684	wmic.exe
Token: SeTakeOwnershipPrivilege	4684	wmic.exe
Token: SeLoadDriverPrivilege	4684	wmic.exe
Token: SeSystemProfilePrivilege	4684	wmic.exe
Token: SeSystemtimePrivilege	4684	wmic.exe
Token: SeProfSingleProcessPrivilege	4684	wmic.exe
Token: SeIncBasePriorityPrivilege	4684	wmic.exe
Token: SeCreatePagefilePrivilege	4684	wmic.exe
Token: SeBackupPrivilege	4684	wmic.exe
Token: SeRestorePrivilege	4684	wmic.exe
Token: SeShutdownPrivilege	4684	wmic.exe
Token: SeDebugPrivilege	4684	wmic.exe
Token: SeSystemEnvironmentPrivilege	4684	wmic.exe
Token: SeRemoteShutdownPrivilege	4684	wmic.exe
Token: SeUndockPrivilege	4684	wmic.exe
Token: SeManageVolumePrivilege	4684	wmic.exe
Token: 33	4684	wmic.exe
Token: 34	4684	wmic.exe
Token: 35	4684	wmic.exe
Token: 36	4684	wmic.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

rundll32.exenvsvc64.exe

description	pid	process	target process
PID 4864 wrote to memory of 2920	4864	rundll32.exe	nvsvc64.exe
PID 4864 wrote to memory of 2920	4864	rundll32.exe	nvsvc64.exe
PID 2920 wrote to memory of 4684	2920	nvsvc64.exe	wmic.exe
PID 2920 wrote to memory of 4684	2920	nvsvc64.exe	wmic.exe

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\nvngx_dlss.dll,#1
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Blocklisted process makes network request
- Checks BIOS information in registry
- Checks computer location settings
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:4864
- C:\Windows\SoftwareDistribution\nvsvc64.exe
  "C:\Windows\SoftwareDistribution\nvsvc64.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2920
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:4684

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

1

T1497

Credential Access

Discovery

Query Registry

3

T1012

System Information Discovery

4

T1082

Virtualization/Sandbox Evasion

1

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\SoftwareDistribution\nvsvc64.exe

Filesize
231KB

MD5
db91000fe7eb1d5e6d6ec2282b9df079

SHA1
796efefed175006f206fe83ecd0e1a0755347646

SHA256
a44fd93c951d382db9062769546c27f46edf147e20b4bbf0ee965a228573c030

SHA512
594dd398418b54abc626da9865b5ffff50052e52b9f628dce7409fee5eadc8d9364f28a8d6739f59d6d161cdbb093c2d029692ad981f77a818c5894dafab8e28

Download Submit
memory/2920-21-0x00000193D61B0000-0x00000193D61F0000-memory.dmp

Filesize
256KB

Download
memory/2920-22-0x00007FF81CA50000-0x00007FF81CC45000-memory.dmp

Filesize
2.0MB

Download
memory/2920-23-0x00007FF81CA50000-0x00007FF81CC45000-memory.dmp

Filesize
2.0MB

Download
memory/2920-25-0x00007FF81CA50000-0x00007FF81CC45000-memory.dmp

Filesize
2.0MB

Download
memory/4864-0-0x0000000180000000-0x0000000180EA8000-memory.dmp

Filesize
14.7MB

Download
memory/4864-1-0x00007FF81CAF0000-0x00007FF81CAF2000-memory.dmp

Filesize
8KB

Download
memory/4864-2-0x0000000180000000-0x0000000180EA8000-memory.dmp

Filesize
14.7MB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads