umbral | fe9b415107f164c76a286b93f647b0501fb83e4dd7f839ab7fec9639c55084ae

Reason

Machine shutdown: "{\"level\":\"info\",\"time\":\"2024-04-22T13:53:58Z\",\"message\":\"Dirty snapshot: /var/lib/sandbox/hatchvm/win10v2004-20240412-en/instance_4-dirty.qcow2\"}"

General

Target

stealer v2.exe
Size

678KB
MD5

942c8ba962017c3f597a54c44c9f57be
SHA1

bc06cee1fc7c218fe0732f6e13c95cb141fd3b2d
SHA256

fe9b415107f164c76a286b93f647b0501fb83e4dd7f839ab7fec9639c55084ae
SHA512

dee865eca7a6a206c1b197e711494118e6fb696ea3497971ea50222550202eb062d30d49f1814c57d80756fc4cb4c340119a65c895acc9f54f6c1c3820517de8
SSDEEP

12288:Riny90J6VGAQWUJFRjynsW+xUid6IeJO70Nv9cpzolz/:RoyJCNJFlysPd6RJOC4zolz/

Score

10^/10

umbral persistence stealer

Malware Config

Extracted

Family

umbral

C2

https://discord.com/api/webhooks/1231373922524598342/SZ4ChwOih600qv0UuiVxKSVU3wzAKLa2uHxdzmR7pdCC3h5QB7aPcVnGRyY3wZSRS0VF

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/3988-51-0x000000001B2D0000-0x000000001B310000-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-1-5-21-259785868-298165991-4178590326-1000\Control Panel\International\Geo\Nation	stealer.exe

Executes dropped EXE 1 IoCs

pid	Process
2320	stealer.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\wextract_cleanup0 = "rundll32.exe C:\\Windows\\system32\\advpack.dll,DelNodeRunDLL32 \"C:\\Users\\Admin\\AppData\\Local\\Temp\\IXP000.TMP\\\""	stealer v2.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.

flow	ioc
4	ip-api.com

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

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
5044	timeout.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4908	powershell.exe
4908	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2320	stealer.exe
Token: SeDebugPrivilege	4908	powershell.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2648 wrote to memory of 3008	2648	stealer v2.exe	84
PID 2648 wrote to memory of 3008	2648	stealer v2.exe	84
PID 3008 wrote to memory of 2320	3008	cmd.exe	86
PID 3008 wrote to memory of 2320	3008	cmd.exe	86
PID 2320 wrote to memory of 4908	2320	stealer.exe	97
PID 2320 wrote to memory of 4908	2320	stealer.exe	97

C:\Users\Admin\AppData\Local\Temp\stealer v2.exe
"C:\Users\Admin\AppData\Local\Temp\stealer v2.exe"
1⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:2648
- C:\Windows\SYSTEM32\cmd.exe
  cmd /c "stealer.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3008
- - C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\stealer.exe
    stealer.exe
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2320
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Windows\task.exe'
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4908
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'task.exe'
      4⤵
      PID:3432
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp6793.tmp.bat""
      4⤵
      PID:4996
    - - C:\Windows\system32\timeout.exe
        
        timeout 3
        5⤵
        Delays execution with timeout.exe
        
        PID:5044

C:\Windows\task.exe
C:\Windows\task.exe
1⤵
PID:3988
- C:\Windows\system32\schtasks.exe
  schtasks /run /TN Update
  2⤵
  PID:4856

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
62623d22bd9e037191765d5083ce16a3

SHA1
4a07da6872672f715a4780513d95ed8ddeefd259

SHA256
95d79fd575bbd21540e378fcbc1cd00d16f51af62ce15bae7080bb72c24e2010

SHA512
9a448b7a0d867466c2ea04ab84d2a9485d5fd20ab53b2b854f491831ee3f1d781b94d2635f7b0b35cb9f2d373cd52c67570879a56a42ed66bc9db06962ed4992

Download Submit
C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\stealer.exe

Filesize
671KB

MD5
bdb421db1041dff30935a0c368f0316e

SHA1
15786e4eb3057abaeab7c2ebbb0e758d9d4c2216

SHA256
ac14f5357b9e35f8e9fccd2727ae133f34acafbd442cdb6f438a6f7a70861ca2

SHA512
0280a8eeb333437c2122b8e47414565bd8492fee285071e612fc09bb82591a56abd5bf4ed1b194f581656ad1f75727b5c51a6ae50f08d7ea7588c36daa9e6b59

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_n5yd3hmg.ocq.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp6793.tmp.bat

Filesize
170B

MD5
2052f8eb3d55d5a3db3e3ff93149506e

SHA1
7b5b80e4b565e7dfb2b63fe9769d1895030834a0

SHA256
fda5b368fe922464fae79b3a1bb0b7183540d3a204b5ac44a6c4061dd739f222

SHA512
629bf082709a75d05357ab2c9b204c915bb2dd38e1ecaf76565c2a4b96427448d8133b9f6210f24c2b271c28216ec52278cf951ce9db54080f6a0525370a8a38

Download Submit
memory/2320-41-0x00007FFA40940000-0x00007FFA41401000-memory.dmp

Filesize
10.8MB

Download
memory/2320-48-0x00007FFA40940000-0x00007FFA41401000-memory.dmp

Filesize
10.8MB

Download
memory/2320-5-0x0000000000140000-0x00000000001EE000-memory.dmp

Filesize
696KB

Download
memory/2320-6-0x00007FFA40940000-0x00007FFA41401000-memory.dmp

Filesize
10.8MB

Download
memory/2320-7-0x000000001AE20000-0x000000001AE30000-memory.dmp

Filesize
64KB

Download
memory/3432-36-0x000001CCF25A0000-0x000001CCF25B0000-memory.dmp

Filesize
64KB

Download
memory/3432-38-0x00007FFA40940000-0x00007FFA41401000-memory.dmp

Filesize
10.8MB

Download
memory/3432-35-0x00007FFA40940000-0x00007FFA41401000-memory.dmp

Filesize
10.8MB

Download
memory/3988-49-0x00007FFA40940000-0x00007FFA41401000-memory.dmp

Filesize
10.8MB

Download
memory/3988-51-0x000000001B2D0000-0x000000001B310000-memory.dmp

Filesize
256KB

Download
memory/3988-50-0x000000001B490000-0x000000001B4A0000-memory.dmp

Filesize
64KB

Download
memory/3988-52-0x000000001B310000-0x000000001B354000-memory.dmp

Filesize
272KB

Download
memory/4908-13-0x0000026D5C560000-0x0000026D5C582000-memory.dmp

Filesize
136KB

Download
memory/4908-23-0x00007FFA40940000-0x00007FFA41401000-memory.dmp

Filesize
10.8MB

Download
memory/4908-20-0x0000026D5C5A0000-0x0000026D5C5B0000-memory.dmp

Filesize
64KB

Download
memory/4908-19-0x0000026D5C5A0000-0x0000026D5C5B0000-memory.dmp

Filesize
64KB

Download
memory/4908-18-0x00007FFA40940000-0x00007FFA41401000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

Errors

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads