umbral | 9fb5c80c2a1e3d90dfd12b92fe46d1971c19c25f4e9094b6a911636b53c06281

Analysis

max time kernel
24s
max time network
28s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
01-07-2024 14:49

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General

Target

Solara.exe
Size

707KB
MD5

890aefe0eb8cac48c07f1b8c32b40c52
SHA1

354100304c1eedfea760b85804f79995cd558e39
SHA256

9fb5c80c2a1e3d90dfd12b92fe46d1971c19c25f4e9094b6a911636b53c06281
SHA512

d4831595f132738558cfc9d2e11e51c7eb68e4ae3b6ce0d81dee506ca5e856f4970cdbd9a15fc9ac0ecb74ed63b1752c2f576a130e1ec1fcdfeeb11330d580c5
SSDEEP

12288:fCQjgAtAHM+vetZxF5EWry8AJGy0yR1Bjy1hbpyPeVo0Wx1Lk:f5ZWs+OZVEWry8AFfrjy1hVyPeVolrLk

Score

10^/10

umbral stealer

Malware Config

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral2/files/0x00070000000233f6-6.dat	family_umbral
behavioral2/memory/4224-24-0x00000218D8520000-0x00000218D8560000-memory.dmp	family_umbral

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

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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000\Control Panel\International\Geo\Nation	Solara.exe

Executes dropped EXE 2 IoCs

pid	Process
4224	SoIaraBootstrapper.exe
4012	SolaraBootstrapper.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 1 IoCs

Web Service

T1102

flow	ioc
7	raw.githubusercontent.com

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4012	SolaraBootstrapper.exe
4012	SolaraBootstrapper.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4224	SoIaraBootstrapper.exe
Token: SeDebugPrivilege	4012	SolaraBootstrapper.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 5076 wrote to memory of 4224	5076	Solara.exe	84
PID 5076 wrote to memory of 4224	5076	Solara.exe	84
PID 5076 wrote to memory of 4012	5076	Solara.exe	86
PID 5076 wrote to memory of 4012	5076	Solara.exe	86
PID 5076 wrote to memory of 4012	5076	Solara.exe	86

C:\Users\Admin\AppData\Local\Temp\Solara.exe
"C:\Users\Admin\AppData\Local\Temp\Solara.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:5076
- C:\Users\Admin\AppData\Local\Temp\SoIaraBootstrapper.exe
  "C:\Users\Admin\AppData\Local\Temp\SoIaraBootstrapper.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:4224
- C:\Users\Admin\AppData\Local\Temp\SolaraBootstrapper.exe
  "C:\Users\Admin\AppData\Local\Temp\SolaraBootstrapper.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4012

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\SoIaraBootstrapper.exe

Filesize
227KB

MD5
c4256ec1eed03d809035bbd044aa0f19

SHA1
a0b69231eb481436b51bb78605e93dcdf5d986d0

SHA256
b4914acc9d1e0cc61549d3c21f290369eea0e9a205ea7ce465b221ae3ef409d4

SHA512
41cfb128462ef590fac4ed44bc1df187f51fb46353579c718bb2e361d97b06a02a970bbe959898b21a2133a7c1732dfe912e0dca8c3d4d3608b15469258006b1

Download Submit
C:\Users\Admin\AppData\Local\Temp\SolaraBootstrapper.exe

Filesize
13KB

MD5
6557bd5240397f026e675afb78544a26

SHA1
839e683bf68703d373b6eac246f19386bb181713

SHA256
a7fecfc225dfdd4e14dcd4d1b4ba1b9f8e4d1984f1cdd8cda3a9987e5d53c239

SHA512
f2399d34898a4c0c201372d2dd084ee66a66a1c3eae949e568421fe7edada697468ef81f4fcab2afd61eaf97bcb98d6ade2d97295e2f674e93116d142e892e97

Download Submit
memory/4012-26-0x0000000000C10000-0x0000000000C1A000-memory.dmp

Filesize
40KB

Download
memory/4012-28-0x0000000002F50000-0x0000000002F5A000-memory.dmp

Filesize
40KB

Download
memory/4224-23-0x00007FFD32733000-0x00007FFD32735000-memory.dmp

Filesize
8KB

Download
memory/4224-24-0x00000218D8520000-0x00000218D8560000-memory.dmp

Filesize
256KB

Download
memory/4224-27-0x00007FFD32730000-0x00007FFD331F1000-memory.dmp

Filesize
10.8MB

Download