umbral | b0f79191d92362d4360f008da24196a5f36f2afa311180f6140e979242af4760

General

Target

1235.exe
Size

228KB
MD5

82a22b60e4a5e4077b18fba2ee9b8f68
SHA1

83e24baf92b4aa460cddc4314565b551f7a066a8
SHA256

b0f79191d92362d4360f008da24196a5f36f2afa311180f6140e979242af4760
SHA512

6d7d0805dcd04f2498a65e2948aa6a67e775a1ba21f34dfec1e0bb231d52a571641fbdbc4fafb35393fb942013c708a5a090394d87a564d42ae941a18fe489c9
SSDEEP

6144:BloZM9rIkd8g+EtXHkv/iD4ycCNKInDA+ZMK7bC+Zb8e1m1i:zoZOL+EP8ycCNKInDA+ZMK7bCGj

Score

10^/10

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/4776-1-0x000002131D310000-0x000002131D350000-memory.dmp	family_umbral

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

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
4512	powershell.exe
1064	powershell.exe
2504	powershell.exe
2272	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	1235.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

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
3	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
1368	wmic.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4512	powershell.exe
4512	powershell.exe
1064	powershell.exe
1064	powershell.exe
2504	powershell.exe
2504	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	4776	1235.exe
Token: SeDebugPrivilege	4512	powershell.exe
Token: SeDebugPrivilege	1064	powershell.exe
Token: SeDebugPrivilege	2504	powershell.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4776 wrote to memory of 1548	4776	1235.exe	80
PID 4776 wrote to memory of 1548	4776	1235.exe	80
PID 4776 wrote to memory of 4512	4776	1235.exe	82
PID 4776 wrote to memory of 4512	4776	1235.exe	82
PID 4776 wrote to memory of 1064	4776	1235.exe	84
PID 4776 wrote to memory of 1064	4776	1235.exe	84
PID 4776 wrote to memory of 2504	4776	1235.exe	86
PID 4776 wrote to memory of 2504	4776	1235.exe	86
PID 4776 wrote to memory of 3824	4776	1235.exe	88
PID 4776 wrote to memory of 3824	4776	1235.exe	88

Views/modifies file attributes 1 TTPs 1 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
1548	attrib.exe

C:\Users\Admin\AppData\Local\Temp\1235.exe
"C:\Users\Admin\AppData\Local\Temp\1235.exe"
1⤵
- Drops file in Drivers directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4776
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\1235.exe"
  2⤵
  - Views/modifies file attributes
  PID:1548
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\1235.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4512
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Set-MpPreference -DisableIntrusionPreventionSystem $true -DisableIOAVProtection $true -DisableRealtimeMonitoring $true -DisableScriptScanning $true -EnableControlledFolderAccess Disabled -EnableNetworkProtection AuditMode -Force -MAPSReporting Disabled -SubmitSamplesConsent NeverSend && powershell Set-MpPreference -SubmitSamplesConsent 2
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1064
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2504
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
  2⤵
  PID:3824
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  PID:1460
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:1384
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:2280
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
  2⤵
  - Command and Scripting Interpreter: PowerShell
  PID:2272
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:1368

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Hide Artifacts

1

T1564

Hidden Files and Directories

1

T1564.001

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
944B

MD5
77d622bb1a5b250869a3238b9bc1402b

SHA1
d47f4003c2554b9dfc4c16f22460b331886b191b

SHA256
f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb

SHA512
d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

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

Filesize
948B

MD5
966914e2e771de7a4a57a95b6ecfa8a9

SHA1
7a32282fd51dd032967ed4d9a40cc57e265aeff2

SHA256
98d3c70d7004fa807897317bd6cd3e977b9b6c72d4d2565aca0f9f8b1c315cba

SHA512
dc39c7124a9c7c8d4c7e8e16290c46360b8d9a8f4e43edaacbbeb09bdcf20159a53db54d2b322372001b6a3de52b2f88e9088b5fdbc7638816ae0d122bb015f5

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

Filesize
1KB

MD5
276798eeb29a49dc6e199768bc9c2e71

SHA1
5fdc8ccb897ac2df7476fbb07517aca5b7a6205b

SHA256
cd0a1056e8f1b6cb5cb328532239d802f4e2aa8f8fcdc0fcb487684bd68e0dcc

SHA512
0d34fce64bbefc57d64fa6e03ca886952263d5f24df9c1c4cce6a1e8f5a47a9a21e9820f8d38caa7f7b43a52336ce00b738ea18419aaa7c788b72e04ce19e4f2

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

Filesize
1KB

MD5
ec79fae4e7c09310ebf4f2d85a33a638

SHA1
f2bdd995b12e65e7ed437d228f22223b59e76efb

SHA256
e9c4723a5fe34e081c3d2f548a1d472394cc7aa58056fcf44ca542061381243a

SHA512
af9dda12f6bb388d826fe03a4a8beed9bda23a978aa55a2af6a43271660ee896a7ee3bcf2c4d2f1e6180902791d8c23560f1c2ec097a501d8c6f4f6c49075625

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_1bnx0dqk.101.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/4512-17-0x00007FFFFAD30000-0x00007FFFFB7F1000-memory.dmp

Filesize
10.8MB

Download
memory/4512-14-0x00007FFFFAD30000-0x00007FFFFB7F1000-memory.dmp

Filesize
10.8MB

Download
memory/4512-15-0x00007FFFFAD30000-0x00007FFFFB7F1000-memory.dmp

Filesize
10.8MB

Download
memory/4512-13-0x00007FFFFAD30000-0x00007FFFFB7F1000-memory.dmp

Filesize
10.8MB

Download
memory/4512-8-0x0000015CF0400000-0x0000015CF0422000-memory.dmp

Filesize
136KB

Download
memory/4776-0-0x00007FFFFAD33000-0x00007FFFFAD35000-memory.dmp

Filesize
8KB

Download
memory/4776-31-0x0000021337AA0000-0x0000021337B16000-memory.dmp

Filesize
472KB

Download
memory/4776-32-0x0000021337B20000-0x0000021337B70000-memory.dmp

Filesize
320KB

Download
memory/4776-33-0x0000021337A40000-0x0000021337A5E000-memory.dmp

Filesize
120KB

Download
memory/4776-2-0x00007FFFFAD30000-0x00007FFFFB7F1000-memory.dmp

Filesize
10.8MB

Download
memory/4776-70-0x00000213377A0000-0x00000213377AA000-memory.dmp

Filesize
40KB

Download
memory/4776-71-0x0000021337A20000-0x0000021337A32000-memory.dmp

Filesize
72KB

Download
memory/4776-1-0x000002131D310000-0x000002131D350000-memory.dmp

Filesize
256KB

Download

Analysis

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