umbral | ed5fe58c45c8b0e48c4c9405ba8065234090e19e145465117e0d2342f43fd872

Analysis

max time kernel
361s
max time network
362s
platform
windows7_x64
resource
win7-20240708-en
resource tags

arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
submitted
20-07-2024 09:40

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General

Target

Krampus/b5uEJHZB6Rl.exe
Size

231KB
MD5

438289fb9c72ed39bf5497f9af21ec7a
SHA1

8120391ecb41ed6a4c6ef0b259776e59311d6997
SHA256

ea4cb7c7b4cfb2fcc04d1c3f96b20c26638e69a97b15cae14659f0d6afb78f85
SHA512

3647907fa2d503a242ef07cb20b081444b75e0c618a91232c8e77903b4b6aa823b8a7cbe07a45e02591fe48fdd23b5eae88565006b85863c0a5f6e42d7589fe0
SSDEEP

6144:YloZM+rIkd8g+EtXHkv/iD4Bs4DdLocD/abtIEx6tb8e1mTiu:GoZtL+EP8Bs4DdLocD/abtIExq1

Score

10^/10

umbral execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/2112-1-0x0000000000DA0000-0x0000000000DE0000-memory.dmp	family_umbral

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

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

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

execution

PowerShell

T1059.001

pid	Process
2860	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	b5uEJHZB6Rl.exe

Deletes itself 1 IoCs

pid	Process
2336	cmd.exe

Reads user/profile data of web browsers 2 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

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
9	discord.com
10	discord.com

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
6	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2932	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2420	PING.EXE

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2112	b5uEJHZB6Rl.exe
2860	powershell.exe
2900	powershell.exe
2616	powershell.exe
1104	powershell.exe
1184	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2112	b5uEJHZB6Rl.exe
Token: SeIncreaseQuotaPrivilege	1644	wmic.exe
Token: SeSecurityPrivilege	1644	wmic.exe
Token: SeTakeOwnershipPrivilege	1644	wmic.exe
Token: SeLoadDriverPrivilege	1644	wmic.exe
Token: SeSystemProfilePrivilege	1644	wmic.exe
Token: SeSystemtimePrivilege	1644	wmic.exe
Token: SeProfSingleProcessPrivilege	1644	wmic.exe
Token: SeIncBasePriorityPrivilege	1644	wmic.exe
Token: SeCreatePagefilePrivilege	1644	wmic.exe
Token: SeBackupPrivilege	1644	wmic.exe
Token: SeRestorePrivilege	1644	wmic.exe
Token: SeShutdownPrivilege	1644	wmic.exe
Token: SeDebugPrivilege	1644	wmic.exe
Token: SeSystemEnvironmentPrivilege	1644	wmic.exe
Token: SeRemoteShutdownPrivilege	1644	wmic.exe
Token: SeUndockPrivilege	1644	wmic.exe
Token: SeManageVolumePrivilege	1644	wmic.exe
Token: 33	1644	wmic.exe
Token: 34	1644	wmic.exe
Token: 35	1644	wmic.exe
Token: SeIncreaseQuotaPrivilege	1644	wmic.exe
Token: SeSecurityPrivilege	1644	wmic.exe
Token: SeTakeOwnershipPrivilege	1644	wmic.exe
Token: SeLoadDriverPrivilege	1644	wmic.exe
Token: SeSystemProfilePrivilege	1644	wmic.exe
Token: SeSystemtimePrivilege	1644	wmic.exe
Token: SeProfSingleProcessPrivilege	1644	wmic.exe
Token: SeIncBasePriorityPrivilege	1644	wmic.exe
Token: SeCreatePagefilePrivilege	1644	wmic.exe
Token: SeBackupPrivilege	1644	wmic.exe
Token: SeRestorePrivilege	1644	wmic.exe
Token: SeShutdownPrivilege	1644	wmic.exe
Token: SeDebugPrivilege	1644	wmic.exe
Token: SeSystemEnvironmentPrivilege	1644	wmic.exe
Token: SeRemoteShutdownPrivilege	1644	wmic.exe
Token: SeUndockPrivilege	1644	wmic.exe
Token: SeManageVolumePrivilege	1644	wmic.exe
Token: 33	1644	wmic.exe
Token: 34	1644	wmic.exe
Token: 35	1644	wmic.exe
Token: SeDebugPrivilege	2860	powershell.exe
Token: SeDebugPrivilege	2900	powershell.exe
Token: SeDebugPrivilege	2616	powershell.exe
Token: SeDebugPrivilege	1104	powershell.exe
Token: SeIncreaseQuotaPrivilege	2960	wmic.exe
Token: SeSecurityPrivilege	2960	wmic.exe
Token: SeTakeOwnershipPrivilege	2960	wmic.exe
Token: SeLoadDriverPrivilege	2960	wmic.exe
Token: SeSystemProfilePrivilege	2960	wmic.exe
Token: SeSystemtimePrivilege	2960	wmic.exe
Token: SeProfSingleProcessPrivilege	2960	wmic.exe
Token: SeIncBasePriorityPrivilege	2960	wmic.exe
Token: SeCreatePagefilePrivilege	2960	wmic.exe
Token: SeBackupPrivilege	2960	wmic.exe
Token: SeRestorePrivilege	2960	wmic.exe
Token: SeShutdownPrivilege	2960	wmic.exe
Token: SeDebugPrivilege	2960	wmic.exe
Token: SeSystemEnvironmentPrivilege	2960	wmic.exe
Token: SeRemoteShutdownPrivilege	2960	wmic.exe
Token: SeUndockPrivilege	2960	wmic.exe
Token: SeManageVolumePrivilege	2960	wmic.exe
Token: 33	2960	wmic.exe
Token: 34	2960	wmic.exe

Suspicious use of WriteProcessMemory 39 IoCs

description	pid	Process	procid_target
PID 2112 wrote to memory of 1644	2112	b5uEJHZB6Rl.exe	30
PID 2112 wrote to memory of 1644	2112	b5uEJHZB6Rl.exe	30
PID 2112 wrote to memory of 1644	2112	b5uEJHZB6Rl.exe	30
PID 2112 wrote to memory of 2760	2112	b5uEJHZB6Rl.exe	33
PID 2112 wrote to memory of 2760	2112	b5uEJHZB6Rl.exe	33
PID 2112 wrote to memory of 2760	2112	b5uEJHZB6Rl.exe	33
PID 2112 wrote to memory of 2860	2112	b5uEJHZB6Rl.exe	35
PID 2112 wrote to memory of 2860	2112	b5uEJHZB6Rl.exe	35
PID 2112 wrote to memory of 2860	2112	b5uEJHZB6Rl.exe	35
PID 2112 wrote to memory of 2900	2112	b5uEJHZB6Rl.exe	37
PID 2112 wrote to memory of 2900	2112	b5uEJHZB6Rl.exe	37
PID 2112 wrote to memory of 2900	2112	b5uEJHZB6Rl.exe	37
PID 2112 wrote to memory of 2616	2112	b5uEJHZB6Rl.exe	39
PID 2112 wrote to memory of 2616	2112	b5uEJHZB6Rl.exe	39
PID 2112 wrote to memory of 2616	2112	b5uEJHZB6Rl.exe	39
PID 2112 wrote to memory of 1104	2112	b5uEJHZB6Rl.exe	41
PID 2112 wrote to memory of 1104	2112	b5uEJHZB6Rl.exe	41
PID 2112 wrote to memory of 1104	2112	b5uEJHZB6Rl.exe	41
PID 2112 wrote to memory of 2960	2112	b5uEJHZB6Rl.exe	43
PID 2112 wrote to memory of 2960	2112	b5uEJHZB6Rl.exe	43
PID 2112 wrote to memory of 2960	2112	b5uEJHZB6Rl.exe	43
PID 2112 wrote to memory of 2520	2112	b5uEJHZB6Rl.exe	45
PID 2112 wrote to memory of 2520	2112	b5uEJHZB6Rl.exe	45
PID 2112 wrote to memory of 2520	2112	b5uEJHZB6Rl.exe	45
PID 2112 wrote to memory of 1648	2112	b5uEJHZB6Rl.exe	47
PID 2112 wrote to memory of 1648	2112	b5uEJHZB6Rl.exe	47
PID 2112 wrote to memory of 1648	2112	b5uEJHZB6Rl.exe	47
PID 2112 wrote to memory of 1184	2112	b5uEJHZB6Rl.exe	49
PID 2112 wrote to memory of 1184	2112	b5uEJHZB6Rl.exe	49
PID 2112 wrote to memory of 1184	2112	b5uEJHZB6Rl.exe	49
PID 2112 wrote to memory of 2932	2112	b5uEJHZB6Rl.exe	51
PID 2112 wrote to memory of 2932	2112	b5uEJHZB6Rl.exe	51
PID 2112 wrote to memory of 2932	2112	b5uEJHZB6Rl.exe	51
PID 2112 wrote to memory of 2336	2112	b5uEJHZB6Rl.exe	53
PID 2112 wrote to memory of 2336	2112	b5uEJHZB6Rl.exe	53
PID 2112 wrote to memory of 2336	2112	b5uEJHZB6Rl.exe	53
PID 2336 wrote to memory of 2420	2336	cmd.exe	55
PID 2336 wrote to memory of 2420	2336	cmd.exe	55
PID 2336 wrote to memory of 2420	2336	cmd.exe	55

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2760	attrib.exe

C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe
"C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2112
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1644
- C:\Windows\system32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe"
  2⤵
  - Views/modifies file attributes
  PID:2760
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2860
- 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⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2900
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2616
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1104
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2960
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2520
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1648
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:1184
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:2932
- C:\Windows\system32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe" && pause
  2⤵
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:2336
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - Runs ping.exe
    PID:2420

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
45883ead4392c9fb5d787e5dad43dd50

SHA1
696708e36058bc86c828fc79934372bc45b4825f

SHA256
50b09836d54f28d0fb9222e1a1209e9b32f4f414990fb405d0d51ffebbe78631

SHA512
78aadc2843705fcd6056525d7beceba9c72b09c2135f2cd95149af07e4a91692e557410ef7ee79abcb344370829a09c37537ce9ce3bc231fd86246cac0261d93

Download Submit
memory/1184-44-0x0000000001E80000-0x0000000001E88000-memory.dmp

Filesize
32KB

Download
memory/2112-0-0x000007FEF5F53000-0x000007FEF5F54000-memory.dmp

Filesize
4KB

Download
memory/2112-1-0x0000000000DA0000-0x0000000000DE0000-memory.dmp

Filesize
256KB

Download
memory/2112-2-0x000007FEF5F50000-0x000007FEF693C000-memory.dmp

Filesize
9.9MB

Download
memory/2112-48-0x000007FEF5F50000-0x000007FEF693C000-memory.dmp

Filesize
9.9MB

Download
memory/2860-7-0x000000001B5D0000-0x000000001B8B2000-memory.dmp

Filesize
2.9MB

Download
memory/2860-8-0x0000000002860000-0x0000000002868000-memory.dmp

Filesize
32KB

Download
memory/2900-14-0x000000001B650000-0x000000001B932000-memory.dmp

Filesize
2.9MB

Download
memory/2900-15-0x00000000004F0000-0x00000000004F8000-memory.dmp

Filesize
32KB

Download