umbral | ed5fe58c45c8b0e48c4c9405ba8065234090e19e145465117e0d2342f43fd872

Analysis

max time kernel
9s
max time network
10s
platform
windows11-21h2_x64
resource
win11-20240802-en
resource tags

arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
submitted
17-08-2024 05:53

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

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 credential_access discovery execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral2/memory/3160-1-0x00000180795A0000-0x00000180795E0000-memory.dmp	family_umbral

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral
Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003

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
1420	powershell.exe
4824	powershell.exe
1688	powershell.exe
3048	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	b5uEJHZB6Rl.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
3	discord.com
6	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
3	ip-api.com

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
3292	cmd.exe
4948	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2184	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4948	PING.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
3160	b5uEJHZB6Rl.exe
1420	powershell.exe
1420	powershell.exe
4824	powershell.exe
4824	powershell.exe
1688	powershell.exe
1688	powershell.exe
2436	powershell.exe
2436	powershell.exe
3048	powershell.exe
3048	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	3160	b5uEJHZB6Rl.exe
Token: SeIncreaseQuotaPrivilege	1680	wmic.exe
Token: SeSecurityPrivilege	1680	wmic.exe
Token: SeTakeOwnershipPrivilege	1680	wmic.exe
Token: SeLoadDriverPrivilege	1680	wmic.exe
Token: SeSystemProfilePrivilege	1680	wmic.exe
Token: SeSystemtimePrivilege	1680	wmic.exe
Token: SeProfSingleProcessPrivilege	1680	wmic.exe
Token: SeIncBasePriorityPrivilege	1680	wmic.exe
Token: SeCreatePagefilePrivilege	1680	wmic.exe
Token: SeBackupPrivilege	1680	wmic.exe
Token: SeRestorePrivilege	1680	wmic.exe
Token: SeShutdownPrivilege	1680	wmic.exe
Token: SeDebugPrivilege	1680	wmic.exe
Token: SeSystemEnvironmentPrivilege	1680	wmic.exe
Token: SeRemoteShutdownPrivilege	1680	wmic.exe
Token: SeUndockPrivilege	1680	wmic.exe
Token: SeManageVolumePrivilege	1680	wmic.exe
Token: 33	1680	wmic.exe
Token: 34	1680	wmic.exe
Token: 35	1680	wmic.exe
Token: 36	1680	wmic.exe
Token: SeIncreaseQuotaPrivilege	1680	wmic.exe
Token: SeSecurityPrivilege	1680	wmic.exe
Token: SeTakeOwnershipPrivilege	1680	wmic.exe
Token: SeLoadDriverPrivilege	1680	wmic.exe
Token: SeSystemProfilePrivilege	1680	wmic.exe
Token: SeSystemtimePrivilege	1680	wmic.exe
Token: SeProfSingleProcessPrivilege	1680	wmic.exe
Token: SeIncBasePriorityPrivilege	1680	wmic.exe
Token: SeCreatePagefilePrivilege	1680	wmic.exe
Token: SeBackupPrivilege	1680	wmic.exe
Token: SeRestorePrivilege	1680	wmic.exe
Token: SeShutdownPrivilege	1680	wmic.exe
Token: SeDebugPrivilege	1680	wmic.exe
Token: SeSystemEnvironmentPrivilege	1680	wmic.exe
Token: SeRemoteShutdownPrivilege	1680	wmic.exe
Token: SeUndockPrivilege	1680	wmic.exe
Token: SeManageVolumePrivilege	1680	wmic.exe
Token: 33	1680	wmic.exe
Token: 34	1680	wmic.exe
Token: 35	1680	wmic.exe
Token: 36	1680	wmic.exe
Token: SeDebugPrivilege	1420	powershell.exe
Token: SeDebugPrivilege	4824	powershell.exe
Token: SeDebugPrivilege	1688	powershell.exe
Token: SeDebugPrivilege	2436	powershell.exe
Token: SeIncreaseQuotaPrivilege	3828	wmic.exe
Token: SeSecurityPrivilege	3828	wmic.exe
Token: SeTakeOwnershipPrivilege	3828	wmic.exe
Token: SeLoadDriverPrivilege	3828	wmic.exe
Token: SeSystemProfilePrivilege	3828	wmic.exe
Token: SeSystemtimePrivilege	3828	wmic.exe
Token: SeProfSingleProcessPrivilege	3828	wmic.exe
Token: SeIncBasePriorityPrivilege	3828	wmic.exe
Token: SeCreatePagefilePrivilege	3828	wmic.exe
Token: SeBackupPrivilege	3828	wmic.exe
Token: SeRestorePrivilege	3828	wmic.exe
Token: SeShutdownPrivilege	3828	wmic.exe
Token: SeDebugPrivilege	3828	wmic.exe
Token: SeSystemEnvironmentPrivilege	3828	wmic.exe
Token: SeRemoteShutdownPrivilege	3828	wmic.exe
Token: SeUndockPrivilege	3828	wmic.exe
Token: SeManageVolumePrivilege	3828	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 3160 wrote to memory of 1680	3160	b5uEJHZB6Rl.exe	82
PID 3160 wrote to memory of 1680	3160	b5uEJHZB6Rl.exe	82
PID 3160 wrote to memory of 3572	3160	b5uEJHZB6Rl.exe	85
PID 3160 wrote to memory of 3572	3160	b5uEJHZB6Rl.exe	85
PID 3160 wrote to memory of 1420	3160	b5uEJHZB6Rl.exe	87
PID 3160 wrote to memory of 1420	3160	b5uEJHZB6Rl.exe	87
PID 3160 wrote to memory of 4824	3160	b5uEJHZB6Rl.exe	89
PID 3160 wrote to memory of 4824	3160	b5uEJHZB6Rl.exe	89
PID 3160 wrote to memory of 1688	3160	b5uEJHZB6Rl.exe	91
PID 3160 wrote to memory of 1688	3160	b5uEJHZB6Rl.exe	91
PID 3160 wrote to memory of 2436	3160	b5uEJHZB6Rl.exe	93
PID 3160 wrote to memory of 2436	3160	b5uEJHZB6Rl.exe	93
PID 3160 wrote to memory of 3828	3160	b5uEJHZB6Rl.exe	95
PID 3160 wrote to memory of 3828	3160	b5uEJHZB6Rl.exe	95
PID 3160 wrote to memory of 2888	3160	b5uEJHZB6Rl.exe	97
PID 3160 wrote to memory of 2888	3160	b5uEJHZB6Rl.exe	97
PID 3160 wrote to memory of 540	3160	b5uEJHZB6Rl.exe	99
PID 3160 wrote to memory of 540	3160	b5uEJHZB6Rl.exe	99
PID 3160 wrote to memory of 3048	3160	b5uEJHZB6Rl.exe	101
PID 3160 wrote to memory of 3048	3160	b5uEJHZB6Rl.exe	101
PID 3160 wrote to memory of 2184	3160	b5uEJHZB6Rl.exe	103
PID 3160 wrote to memory of 2184	3160	b5uEJHZB6Rl.exe	103
PID 3160 wrote to memory of 3292	3160	b5uEJHZB6Rl.exe	105
PID 3160 wrote to memory of 3292	3160	b5uEJHZB6Rl.exe	105
PID 3292 wrote to memory of 4948	3292	cmd.exe	107
PID 3292 wrote to memory of 4948	3292	cmd.exe	107

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
3572	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:3160
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1680
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe"
  2⤵
  - Views/modifies file attributes
  PID:3572
- 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:1420
- 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:4824
- 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:1688
- 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:2436
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3828
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2888
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:540
- 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
  - Suspicious behavior: EnumeratesProcesses
  PID:3048
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:2184
- 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⤵
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:3292
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:4948

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

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Web Service

T1102

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
2KB

MD5
627073ee3ca9676911bee35548eff2b8

SHA1
4c4b68c65e2cab9864b51167d710aa29ebdcff2e

SHA256
85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

SHA512
3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

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

Filesize
944B

MD5
2e8eb51096d6f6781456fef7df731d97

SHA1
ec2aaf851a618fb43c3d040a13a71997c25bda43

SHA256
96bfd9dd5883329927fe8c08b8956355a1a6ceb30ceeb5d4252b346df32bc864

SHA512
0a73dc9a49f92d9dd556c2ca2e36761890b3538f355ee1f013e7cf648d8c4d065f28046cd4a167db3dea304d1fbcbcea68d11ce6e12a3f20f8b6c018a60422d2

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

Filesize
948B

MD5
c230f1a32f68ffad79c2565eef0c7b46

SHA1
c6a64c0d274515bd1678613291a63761dfdeb00d

SHA256
fcf7ecf08eb2c56ee80d65e01c46d72973e821fb50e7e2e4ebce36efaa5b6303

SHA512
79ad7c0f720251555af84adf0de4f15e6f824ac5af47a2446c27d4534bc230e686fb96d2b07cf44b23e32fe2142413b80d57a1bddc7a3f0738bcc4c62fe93759

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

Filesize
1KB

MD5
7332074ae2b01262736b6fbd9e100dac

SHA1
22f992165065107cc9417fa4117240d84414a13c

SHA256
baea84fda6c1f13090b8cbd91c920848946f10ce155ef31a1df4cd453ee7e4aa

SHA512
4ae6f0e012c31ac1fc2ff4a8877ce2b4667c45b6e651de798318a39a2b6fd39a6f72dffa8b0b89b7a045a27d724d195656faa25a9fec79b22f37ddebb5d22da2

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

Filesize
1KB

MD5
ce4307dd75ed017814ad85aa5c7fcc6d

SHA1
6baa7bba8ee1d6ca712381c7e915acc938645fda

SHA256
96a49f541b6a6de4dc28c6a053673d0ae7160acdb0f9446289e2a77baa4f826a

SHA512
6535adc2a9bce605ff2303c26979d3ee8482ebde11d86b5cf88fb0efc16976dd8b85beadfd2635e17b9ce4244bf46e0714b7c29904058f13d0192a35a6c2cf37

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_fmhjwo25.hlt.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1420-9-0x00007FFCDD8D0000-0x00007FFCDE392000-memory.dmp

Filesize
10.8MB

Download
memory/1420-13-0x000001AD52090000-0x000001AD520B2000-memory.dmp

Filesize
136KB

Download
memory/1420-14-0x00007FFCDD8D0000-0x00007FFCDE392000-memory.dmp

Filesize
10.8MB

Download
memory/1420-17-0x00007FFCDD8D0000-0x00007FFCDE392000-memory.dmp

Filesize
10.8MB

Download
memory/1420-3-0x00007FFCDD8D0000-0x00007FFCDE392000-memory.dmp

Filesize
10.8MB

Download
memory/3160-32-0x000001807BE40000-0x000001807BE90000-memory.dmp

Filesize
320KB

Download
memory/3160-31-0x000001807BDC0000-0x000001807BE36000-memory.dmp

Filesize
472KB

Download
memory/3160-33-0x000001807B3C0000-0x000001807B3DE000-memory.dmp

Filesize
120KB

Download
memory/3160-1-0x00000180795A0000-0x00000180795E0000-memory.dmp

Filesize
256KB

Download
memory/3160-0-0x00007FFCDD8D3000-0x00007FFCDD8D5000-memory.dmp

Filesize
8KB

Download
memory/3160-67-0x000001807B410000-0x000001807B41A000-memory.dmp

Filesize
40KB

Download
memory/3160-68-0x000001807BD60000-0x000001807BD72000-memory.dmp

Filesize
72KB

Download
memory/3160-2-0x00007FFCDD8D0000-0x00007FFCDE392000-memory.dmp

Filesize
10.8MB

Download
memory/3160-82-0x00007FFCDD8D3000-0x00007FFCDD8D5000-memory.dmp

Filesize
8KB

Download
memory/3160-86-0x00007FFCDD8D0000-0x00007FFCDE392000-memory.dmp

Filesize
10.8MB

Download