umbral | fe9b415107f164c76a286b93f647b0501fb83e4dd7f839ab7fec9639c55084ae

Reason

Machine shutdown: "{\"level\":\"info\",\"time\":\"2024-04-22T13:53:59Z\",\"message\":\"Dirty snapshot: /var/lib/sandbox/hatchvm/win10v2004-20240412-en/instance_12-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
behavioral4/memory/432-50-0x000000001B1E0000-0x000000001B220000-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-1-5-21-4084619521-2220719027-1909462854-1000\Control Panel\International\Geo\Nation	stealer.exe

Executes dropped EXE 2 IoCs

pid	Process
3760	stealer.exe
432	task.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
7	ip-api.com

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\task.exe	stealer.exe
File opened for modification	C:\Windows\task.exe	stealer.exe

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
3164	timeout.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2100	powershell.exe
2100	powershell.exe
1180	powershell.exe
1180	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	3760	stealer.exe
Token: SeDebugPrivilege	2100	powershell.exe
Token: SeDebugPrivilege	1180	powershell.exe
Token: SeDebugPrivilege	432	task.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 3112 wrote to memory of 2692	3112	stealer v2.exe	84
PID 3112 wrote to memory of 2692	3112	stealer v2.exe	84
PID 2692 wrote to memory of 3760	2692	cmd.exe	86
PID 2692 wrote to memory of 3760	2692	cmd.exe	86
PID 3760 wrote to memory of 2100	3760	stealer.exe	88
PID 3760 wrote to memory of 2100	3760	stealer.exe	88
PID 3760 wrote to memory of 1180	3760	stealer.exe	91
PID 3760 wrote to memory of 1180	3760	stealer.exe	91
PID 3760 wrote to memory of 1036	3760	stealer.exe	100
PID 3760 wrote to memory of 1036	3760	stealer.exe	100
PID 1036 wrote to memory of 3164	1036	cmd.exe	102
PID 1036 wrote to memory of 3164	1036	cmd.exe	102

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

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:3112
- C:\Windows\SYSTEM32\cmd.exe
  cmd /c "stealer.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2692
- - C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\stealer.exe
    stealer.exe
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Drops file in Windows directory
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:3760
  - - 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:2100
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'task.exe'
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1180
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp44AA.tmp.bat""
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1036
    - - C:\Windows\system32\timeout.exe
        
        timeout 3
        5⤵
        Delays execution with timeout.exe
        
        PID:3164

C:\Windows\task.exe
C:\Windows\task.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:432
- C:\Windows\system32\schtasks.exe
  schtasks /run /TN Update
  2⤵
  PID:4120

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

2

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
59d97011e091004eaffb9816aa0b9abd

SHA1
1602a56b01dd4b7c577ca27d3117e4bcc1aa657b

SHA256
18f381e0db020a763b8c515c346ef58679ab9c403267eacfef5359e272f7e71d

SHA512
d9ca49c1a17580981e2c1a50d73c0eecaa7a62f8514741512172e395af2a3d80aeb0f71c58bc7f52c18246d57ba67af09b6bff4776877d6cc6f0245c30e092d6

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_gsytjlzl.aqa.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp44AA.tmp.bat

Filesize
170B

MD5
0956de8e46817a9da34dfd011f1fc60e

SHA1
2913117332fcfa4a0984a62dbd639ed3f02d0653

SHA256
5a07325842c73924433cbf4e7bb413a367f4c4e71e02fab410d2c32402a67b33

SHA512
62c78ae9b39e2a1f3f5355eea0d3b7eeeb459159411f4e6644f85c0033b75be7a400342f1b754871c052a30affcebe8ff49e9b348d2742bc4d4c5ba8b4657d5e

Download Submit
memory/432-54-0x000000001B2A0000-0x000000001B2B0000-memory.dmp

Filesize
64KB

Download
memory/432-51-0x000000001B230000-0x000000001B274000-memory.dmp

Filesize
272KB

Download
memory/432-50-0x000000001B1E0000-0x000000001B220000-memory.dmp

Filesize
256KB

Download
memory/432-49-0x00007FFA6E4A0000-0x00007FFA6EF61000-memory.dmp

Filesize
10.8MB

Download
memory/1180-25-0x00007FFA6E4A0000-0x00007FFA6EF61000-memory.dmp

Filesize
10.8MB

Download
memory/1180-38-0x00007FFA6E4A0000-0x00007FFA6EF61000-memory.dmp

Filesize
10.8MB

Download
memory/1180-26-0x000001EDC29A0000-0x000001EDC29B0000-memory.dmp

Filesize
64KB

Download
memory/2100-9-0x000001DE4BEA0000-0x000001DE4BEB0000-memory.dmp

Filesize
64KB

Download
memory/2100-23-0x00007FFA6E4A0000-0x00007FFA6EF61000-memory.dmp

Filesize
10.8MB

Download
memory/2100-16-0x000001DE4BE50000-0x000001DE4BE72000-memory.dmp

Filesize
136KB

Download
memory/2100-10-0x000001DE4BEA0000-0x000001DE4BEB0000-memory.dmp

Filesize
64KB

Download
memory/2100-8-0x00007FFA6E4A0000-0x00007FFA6EF61000-memory.dmp

Filesize
10.8MB

Download
memory/3760-46-0x000000001BA80000-0x000000001BB82000-memory.dmp

Filesize
1.0MB

Download
memory/3760-48-0x00007FFA6E4A0000-0x00007FFA6EF61000-memory.dmp

Filesize
10.8MB

Download
memory/3760-7-0x000000001BA00000-0x000000001BA10000-memory.dmp

Filesize
64KB

Download
memory/3760-6-0x00007FFA6E4A0000-0x00007FFA6EF61000-memory.dmp

Filesize
10.8MB

Download
memory/3760-5-0x0000000000C90000-0x0000000000D3E000-memory.dmp

Filesize
696KB

Download

Analysis

Sharing

Errors

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads