Malware Analysis Report

2024-10-10 10:07

Sample ID 240418-s83nlahb27
Target Krampus.rar
SHA256 ed5fe58c45c8b0e48c4c9405ba8065234090e19e145465117e0d2342f43fd872
Tags
umbral spyware stealer
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral3

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

ed5fe58c45c8b0e48c4c9405ba8065234090e19e145465117e0d2342f43fd872

Threat Level: Known bad

The file Krampus.rar was found to be: Known bad.

Malicious Activity Summary

umbral spyware stealer

Umbral family

Umbral

Detect Umbral payload

Drops file in Drivers directory

Reads user/profile data of web browsers

Looks up external IP address via web service

Enumerates physical storage devices

Unsigned PE

Suspicious use of WriteProcessMemory

Suspicious use of SetWindowsHookEx

Suspicious behavior: EnumeratesProcesses

Modifies registry class

Suspicious use of AdjustPrivilegeToken

Views/modifies file attributes

Detects videocard installed

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-04-18 15:48

Signatures

Detect Umbral payload

Description Indicator Process Target
N/A N/A N/A N/A

Umbral family

umbral

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-04-18 15:48

Reported

2024-04-18 15:51

Platform

win11-20240412-en

Max time kernel

147s

Max time network

151s

Command Line

cmd /c C:\Users\Admin\AppData\Local\Temp\Krampus.rar

Signatures

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-3263309122-2820180308-3568046652-1000_Classes\Local Settings C:\Windows\system32\cmd.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3263309122-2820180308-3568046652-1000_Classes\Local Settings C:\Windows\system32\OpenWith.exe N/A

Processes

C:\Windows\system32\cmd.exe

cmd /c C:\Users\Admin\AppData\Local\Temp\Krampus.rar

C:\Windows\system32\OpenWith.exe

C:\Windows\system32\OpenWith.exe -Embedding

Network

Country Destination Domain Proto
IE 52.111.236.22:443 tcp
US 8.8.8.8:53 19.229.111.52.in-addr.arpa udp

Files

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2024-04-18 15:48

Reported

2024-04-18 15:49

Platform

win11-20240412-en

Max time kernel

6s

Max time network

20s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe"

Signatures

Detect Umbral payload

Description Indicator Process Target
N/A N/A N/A N/A

Umbral

stealer umbral

Drops file in Drivers directory

Description Indicator Process Target
File opened for modification C:\Windows\System32\drivers\etc\hosts C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe N/A

Reads user/profile data of web browsers

spyware stealer

Looks up external IP address via web service

Description Indicator Process Target
N/A ip-api.com N/A N/A

Detects videocard installed

Description Indicator Process Target
N/A N/A C:\Windows\System32\Wbem\wmic.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe N/A
Token: SeIncreaseQuotaPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeSecurityPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeTakeOwnershipPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeLoadDriverPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeSystemProfilePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeSystemtimePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeProfSingleProcessPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeCreatePagefilePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeRestorePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeSystemEnvironmentPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeRemoteShutdownPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeUndockPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeManageVolumePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: 33 N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: 34 N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: 35 N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: 36 N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeIncreaseQuotaPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeSecurityPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeTakeOwnershipPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeLoadDriverPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeSystemProfilePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeSystemtimePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeProfSingleProcessPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeCreatePagefilePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeRestorePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeSystemEnvironmentPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeRemoteShutdownPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeUndockPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeManageVolumePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: 33 N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: 34 N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: 35 N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: 36 N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2092 wrote to memory of 3368 N/A C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe C:\Windows\System32\Wbem\wmic.exe
PID 2092 wrote to memory of 3368 N/A C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe C:\Windows\System32\Wbem\wmic.exe
PID 2092 wrote to memory of 1136 N/A C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe C:\Windows\SYSTEM32\attrib.exe
PID 2092 wrote to memory of 1136 N/A C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe C:\Windows\SYSTEM32\attrib.exe
PID 2092 wrote to memory of 2824 N/A C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2092 wrote to memory of 2824 N/A C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2092 wrote to memory of 5052 N/A C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2092 wrote to memory of 5052 N/A C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2092 wrote to memory of 3572 N/A C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2092 wrote to memory of 3572 N/A C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

Views/modifies file attributes

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SYSTEM32\attrib.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe

"C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe"

C:\Windows\System32\Wbem\wmic.exe

"wmic.exe" csproduct get uuid

C:\Windows\SYSTEM32\attrib.exe

"attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe"

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe'

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

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY

C:\Windows\System32\Wbem\wmic.exe

"wmic.exe" os get Caption

C:\Windows\System32\Wbem\wmic.exe

"wmic.exe" computersystem get totalphysicalmemory

C:\Windows\System32\Wbem\wmic.exe

"wmic.exe" csproduct get uuid

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER

C:\Windows\System32\Wbem\wmic.exe

"wmic" path win32_VideoController get name

Network

Country Destination Domain Proto
US 8.8.8.8:53 gstatic.com udp
GB 172.217.16.227:443 gstatic.com tcp
US 208.95.112.1:80 ip-api.com tcp
US 8.8.8.8:53 227.16.217.172.in-addr.arpa udp
US 208.95.112.1:80 ip-api.com tcp

Files

memory/2092-0-0x000001DD8E4A0000-0x000001DD8E4E0000-memory.dmp

memory/2092-1-0x00007FFA17760000-0x00007FFA18222000-memory.dmp

memory/2092-2-0x000001DDA8AF0000-0x000001DDA8B00000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_jib5u2fi.orh.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/2824-11-0x0000015515430000-0x0000015515452000-memory.dmp

memory/2824-12-0x00007FFA17760000-0x00007FFA18222000-memory.dmp

memory/2824-13-0x000001552DAA0000-0x000001552DAB0000-memory.dmp

memory/2824-14-0x000001552DAA0000-0x000001552DAB0000-memory.dmp

memory/2824-15-0x000001552DAA0000-0x000001552DAB0000-memory.dmp

memory/2824-18-0x00007FFA17760000-0x00007FFA18222000-memory.dmp

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

MD5 627073ee3ca9676911bee35548eff2b8
SHA1 4c4b68c65e2cab9864b51167d710aa29ebdcff2e
SHA256 85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c
SHA512 3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

memory/5052-20-0x00007FFA17760000-0x00007FFA18222000-memory.dmp

memory/5052-21-0x00000187BBC10000-0x00000187BBC20000-memory.dmp

memory/5052-22-0x00000187BBC10000-0x00000187BBC20000-memory.dmp

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

MD5 2e8eb51096d6f6781456fef7df731d97
SHA1 ec2aaf851a618fb43c3d040a13a71997c25bda43
SHA256 96bfd9dd5883329927fe8c08b8956355a1a6ceb30ceeb5d4252b346df32bc864
SHA512 0a73dc9a49f92d9dd556c2ca2e36761890b3538f355ee1f013e7cf648d8c4d065f28046cd4a167db3dea304d1fbcbcea68d11ce6e12a3f20f8b6c018a60422d2

memory/5052-32-0x00000187BBC10000-0x00000187BBC20000-memory.dmp

memory/2092-33-0x00007FFA17760000-0x00007FFA18222000-memory.dmp

memory/5052-34-0x00000187BBC10000-0x00000187BBC20000-memory.dmp

memory/5052-36-0x00007FFA17760000-0x00007FFA18222000-memory.dmp

memory/2092-39-0x000001DDA8C80000-0x000001DDA8CF6000-memory.dmp

memory/2092-40-0x000001DDA8D00000-0x000001DDA8D50000-memory.dmp

memory/2092-41-0x000001DDA8AD0000-0x000001DDA8AEE000-memory.dmp

memory/3572-50-0x00007FFA17760000-0x00007FFA18222000-memory.dmp

memory/3572-51-0x000002953A230000-0x000002953A240000-memory.dmp

memory/3572-52-0x000002953A230000-0x000002953A240000-memory.dmp

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

MD5 441a842138038e6385e430a90d7ea608
SHA1 7b3712d2cdd37e10ee9b3994131ee5175e920f01
SHA256 47592f3324179912d3bdba336b9e75568c2c5f1a9fb37c1ba9f0db9df822164c
SHA512 9dbddc3216f2a132ae3961b3aeac2c5b8828dcc9292f6c5bf1171c47453aa8687f92658818d771413492c0ea565e9ede17b9c03e427af9dc2ac21a78369a6666

memory/2092-54-0x000001DDA8AF0000-0x000001DDA8B00000-memory.dmp

memory/3572-67-0x000002953A230000-0x000002953A240000-memory.dmp

memory/3572-69-0x00007FFA17760000-0x00007FFA18222000-memory.dmp

memory/1152-78-0x00007FFA17760000-0x00007FFA18222000-memory.dmp

memory/1152-81-0x000001FFBFE90000-0x000001FFBFEA0000-memory.dmp

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

MD5 e8ad350bb24c7ab38efd0ef0553239c7
SHA1 887c19e4c11de19854458e26a1ed05b67a75bf29
SHA256 5cf85b38cbbf1a064a4f8001a0ec031993d44e46b8e65d713785c84916cb8ffd
SHA512 74fef147e98b8b576712c212174a7793deb619d54c7ac7956e38ed4e09202f0c93ae4ec9e89cd4d0ac79c481d30c5c3fc5a3d042537c74d7bffda1f8453aef6e

memory/1152-82-0x000001FFBFE90000-0x000001FFBFEA0000-memory.dmp

memory/1152-79-0x000001FFBFE90000-0x000001FFBFEA0000-memory.dmp

memory/1152-84-0x00007FFA17760000-0x00007FFA18222000-memory.dmp

memory/2092-87-0x000001DDA8C50000-0x000001DDA8C62000-memory.dmp

memory/2092-86-0x000001DDA8C20000-0x000001DDA8C2A000-memory.dmp

memory/2016-90-0x00007FFA17760000-0x00007FFA18222000-memory.dmp

memory/2016-91-0x0000023863350000-0x0000023863360000-memory.dmp

memory/2016-92-0x0000023863350000-0x0000023863360000-memory.dmp

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

MD5 21afec55047674edd150dc516f1c851e
SHA1 e4b709d2bfaf132bd729e61b9740948dffaffa90
SHA256 43844e938dc4b56a86c4aedec50551f4771076cdcd2033416f6194a9bc84a951
SHA512 63e12c9a9e783494d86c09f1a5bf151a311e789beefcdc1ab86d7e485bc97ecbdf609f6933a0f59243d4198b4483d1ebabc4aa42734f81f2a1785c59c8281510

memory/2016-102-0x0000023863350000-0x0000023863360000-memory.dmp

memory/2016-104-0x00007FFA17760000-0x00007FFA18222000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2024-04-18 15:48

Reported

2024-04-18 15:51

Platform

win11-20240412-en

Max time kernel

144s

Max time network

152s

Command Line

cmd /c C:\Users\Admin\AppData\Local\Temp\Krampus\krampusexec-65cafadfc556c.txt

Signatures

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-243033537-3771492294-1461557691-1000_Classes\Local Settings C:\Windows\system32\cmd.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3528 wrote to memory of 4912 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\NOTEPAD.EXE
PID 3528 wrote to memory of 4912 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\NOTEPAD.EXE

Processes

C:\Windows\system32\cmd.exe

cmd /c C:\Users\Admin\AppData\Local\Temp\Krampus\krampusexec-65cafadfc556c.txt

C:\Windows\system32\NOTEPAD.EXE

"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Local\Temp\Krampus\krampusexec-65cafadfc556c.txt

Network

Files

N/A