umbral | 18448b3f95efc450d3183f547c3b3f74d645911e3e198895a429d1cd02080922

Analysis

max time kernel
94s
max time network
98s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
05-09-2024 01:43

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General

Target

kk.exe
Size

231KB
MD5

2e5358fcd0403cf1c6dd36a32952d9ea
SHA1

cb03dcf965d79b39657643469b6bbdec205c0a22
SHA256

18448b3f95efc450d3183f547c3b3f74d645911e3e198895a429d1cd02080922
SHA512

0bc336ebad20497f6d8a89db417106ae0f306bd34588e1118b6d82b1da63890ab7ef35b646d259ac78d7c92bc3fcf87d96596f9c61de31910c7d2c4a3ebfaaac
SSDEEP

6144:xloZMarIkd8g+EtXHkv/iD4kNJe5nsAvEOXZkQlzIb8e1m2P7Ai:DoZhL+EP8kNJe5nsAvEOXZkQlE57Z

Score

10^/10

umbral credential_access discovery execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/5012-1-0x000001F481E50000-0x000001F481E90000-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
2076	powershell.exe
3452	powershell.exe
2028	powershell.exe
2512	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	kk.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
28	discord.com
27	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
4684	PING.EXE
1416	cmd.exe

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
3252	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4684	PING.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
5012	kk.exe
2076	powershell.exe
2076	powershell.exe
3452	powershell.exe
3452	powershell.exe
2028	powershell.exe
2028	powershell.exe
1408	powershell.exe
1408	powershell.exe
2512	powershell.exe
2512	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	5012	kk.exe
Token: SeIncreaseQuotaPrivilege	4984	wmic.exe
Token: SeSecurityPrivilege	4984	wmic.exe
Token: SeTakeOwnershipPrivilege	4984	wmic.exe
Token: SeLoadDriverPrivilege	4984	wmic.exe
Token: SeSystemProfilePrivilege	4984	wmic.exe
Token: SeSystemtimePrivilege	4984	wmic.exe
Token: SeProfSingleProcessPrivilege	4984	wmic.exe
Token: SeIncBasePriorityPrivilege	4984	wmic.exe
Token: SeCreatePagefilePrivilege	4984	wmic.exe
Token: SeBackupPrivilege	4984	wmic.exe
Token: SeRestorePrivilege	4984	wmic.exe
Token: SeShutdownPrivilege	4984	wmic.exe
Token: SeDebugPrivilege	4984	wmic.exe
Token: SeSystemEnvironmentPrivilege	4984	wmic.exe
Token: SeRemoteShutdownPrivilege	4984	wmic.exe
Token: SeUndockPrivilege	4984	wmic.exe
Token: SeManageVolumePrivilege	4984	wmic.exe
Token: 33	4984	wmic.exe
Token: 34	4984	wmic.exe
Token: 35	4984	wmic.exe
Token: 36	4984	wmic.exe
Token: SeIncreaseQuotaPrivilege	4984	wmic.exe
Token: SeSecurityPrivilege	4984	wmic.exe
Token: SeTakeOwnershipPrivilege	4984	wmic.exe
Token: SeLoadDriverPrivilege	4984	wmic.exe
Token: SeSystemProfilePrivilege	4984	wmic.exe
Token: SeSystemtimePrivilege	4984	wmic.exe
Token: SeProfSingleProcessPrivilege	4984	wmic.exe
Token: SeIncBasePriorityPrivilege	4984	wmic.exe
Token: SeCreatePagefilePrivilege	4984	wmic.exe
Token: SeBackupPrivilege	4984	wmic.exe
Token: SeRestorePrivilege	4984	wmic.exe
Token: SeShutdownPrivilege	4984	wmic.exe
Token: SeDebugPrivilege	4984	wmic.exe
Token: SeSystemEnvironmentPrivilege	4984	wmic.exe
Token: SeRemoteShutdownPrivilege	4984	wmic.exe
Token: SeUndockPrivilege	4984	wmic.exe
Token: SeManageVolumePrivilege	4984	wmic.exe
Token: 33	4984	wmic.exe
Token: 34	4984	wmic.exe
Token: 35	4984	wmic.exe
Token: 36	4984	wmic.exe
Token: SeDebugPrivilege	2076	powershell.exe
Token: SeDebugPrivilege	3452	powershell.exe
Token: SeDebugPrivilege	2028	powershell.exe
Token: SeDebugPrivilege	1408	powershell.exe
Token: SeIncreaseQuotaPrivilege	2484	wmic.exe
Token: SeSecurityPrivilege	2484	wmic.exe
Token: SeTakeOwnershipPrivilege	2484	wmic.exe
Token: SeLoadDriverPrivilege	2484	wmic.exe
Token: SeSystemProfilePrivilege	2484	wmic.exe
Token: SeSystemtimePrivilege	2484	wmic.exe
Token: SeProfSingleProcessPrivilege	2484	wmic.exe
Token: SeIncBasePriorityPrivilege	2484	wmic.exe
Token: SeCreatePagefilePrivilege	2484	wmic.exe
Token: SeBackupPrivilege	2484	wmic.exe
Token: SeRestorePrivilege	2484	wmic.exe
Token: SeShutdownPrivilege	2484	wmic.exe
Token: SeDebugPrivilege	2484	wmic.exe
Token: SeSystemEnvironmentPrivilege	2484	wmic.exe
Token: SeRemoteShutdownPrivilege	2484	wmic.exe
Token: SeUndockPrivilege	2484	wmic.exe
Token: SeManageVolumePrivilege	2484	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 5012 wrote to memory of 4984	5012	kk.exe	84
PID 5012 wrote to memory of 4984	5012	kk.exe	84
PID 5012 wrote to memory of 4584	5012	kk.exe	93
PID 5012 wrote to memory of 4584	5012	kk.exe	93
PID 5012 wrote to memory of 2076	5012	kk.exe	95
PID 5012 wrote to memory of 2076	5012	kk.exe	95
PID 5012 wrote to memory of 3452	5012	kk.exe	98
PID 5012 wrote to memory of 3452	5012	kk.exe	98
PID 5012 wrote to memory of 2028	5012	kk.exe	100
PID 5012 wrote to memory of 2028	5012	kk.exe	100
PID 5012 wrote to memory of 1408	5012	kk.exe	102
PID 5012 wrote to memory of 1408	5012	kk.exe	102
PID 5012 wrote to memory of 2484	5012	kk.exe	105
PID 5012 wrote to memory of 2484	5012	kk.exe	105
PID 5012 wrote to memory of 4404	5012	kk.exe	107
PID 5012 wrote to memory of 4404	5012	kk.exe	107
PID 5012 wrote to memory of 2852	5012	kk.exe	109
PID 5012 wrote to memory of 2852	5012	kk.exe	109
PID 5012 wrote to memory of 2512	5012	kk.exe	111
PID 5012 wrote to memory of 2512	5012	kk.exe	111
PID 5012 wrote to memory of 3252	5012	kk.exe	114
PID 5012 wrote to memory of 3252	5012	kk.exe	114
PID 5012 wrote to memory of 1416	5012	kk.exe	117
PID 5012 wrote to memory of 1416	5012	kk.exe	117
PID 1416 wrote to memory of 4684	1416	cmd.exe	119
PID 1416 wrote to memory of 4684	1416	cmd.exe	119

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
4584	attrib.exe

C:\Users\Admin\AppData\Local\Temp\kk.exe
"C:\Users\Admin\AppData\Local\Temp\kk.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5012
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4984
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\kk.exe"
  2⤵
  - Views/modifies file attributes
  PID:4584
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\kk.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2076
- 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:3452
- 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:2028
- 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:1408
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2484
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:4404
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:2852
- 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:2512
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:3252
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\kk.exe" && pause
  2⤵
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:1416
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:4684

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
3a6bad9528f8e23fb5c77fbd81fa28e8

SHA1
f127317c3bc6407f536c0f0600dcbcf1aabfba36

SHA256
986366767de5873f1b170a63f2a33ce05132d1afd90c8f5017afbca8ef1beb05

SHA512
846002154a0ece6f3e9feda6f115d3161dc21b3789525dd62ae1d9188495171293efdbe7be4710666dd8a15e66b557315b5a02918a741ed1d5f3ff0c515b98e2

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

Filesize
948B

MD5
ab15c2f399cbee7ce51a6d70081b97fc

SHA1
3224fa6dc24cb8bd9f79d327b17160690c8951c0

SHA256
06665303c0f3c538674a84cb319b028c5a7c1ce8024bcde1daff0b873555e242

SHA512
2f1aed3082fc5359da85a37b50395ff5614a167704a6ea36e9edb50b526392b0ed1305a1cf49ee511758ec3a951e109feb0af212375b789f0699abc956c318a3

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

Filesize
1KB

MD5
276798eeb29a49dc6e199768bc9c2e71

SHA1
5fdc8ccb897ac2df7476fbb07517aca5b7a6205b

SHA256
cd0a1056e8f1b6cb5cb328532239d802f4e2aa8f8fcdc0fcb487684bd68e0dcc

SHA512
0d34fce64bbefc57d64fa6e03ca886952263d5f24df9c1c4cce6a1e8f5a47a9a21e9820f8d38caa7f7b43a52336ce00b738ea18419aaa7c788b72e04ce19e4f2

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

Filesize
1KB

MD5
c1cca1eaf3605a34e79d047e2a85c328

SHA1
58dcc0e5d357f4b1aca1836a368e473aeba45cab

SHA256
bb5ecff4f61a42f032434828cfde49f13a0c5a01a911012b84a23c90c3d70175

SHA512
5ec798679a025d23499c5820536eeeb6caeceba8cc2bfafdaad5d38baa68069866b656039ea823f8256a5b1931fbc54426931e00ca943e09561195c412d4850b

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_dzdnp3om.o4x.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2076-4-0x00007FFCD1980000-0x00007FFCD2441000-memory.dmp

Filesize
10.8MB

Download
memory/2076-14-0x000001F74CFF0000-0x000001F74D012000-memory.dmp

Filesize
136KB

Download
memory/2076-15-0x00007FFCD1980000-0x00007FFCD2441000-memory.dmp

Filesize
10.8MB

Download
memory/2076-18-0x00007FFCD1980000-0x00007FFCD2441000-memory.dmp

Filesize
10.8MB

Download
memory/2076-3-0x00007FFCD1980000-0x00007FFCD2441000-memory.dmp

Filesize
10.8MB

Download
memory/5012-34-0x000001F483C10000-0x000001F483C60000-memory.dmp

Filesize
320KB

Download
memory/5012-33-0x000001F49C640000-0x000001F49C6B6000-memory.dmp

Filesize
472KB

Download
memory/5012-35-0x000001F483AB0000-0x000001F483ACE000-memory.dmp

Filesize
120KB

Download
memory/5012-1-0x000001F481E50000-0x000001F481E90000-memory.dmp

Filesize
256KB

Download
memory/5012-0-0x00007FFCD1983000-0x00007FFCD1985000-memory.dmp

Filesize
8KB

Download
memory/5012-70-0x000001F483AE0000-0x000001F483AEA000-memory.dmp

Filesize
40KB

Download
memory/5012-71-0x000001F483C80000-0x000001F483C92000-memory.dmp

Filesize
72KB

Download
memory/5012-73-0x00007FFCD1983000-0x00007FFCD1985000-memory.dmp

Filesize
8KB

Download
memory/5012-2-0x00007FFCD1980000-0x00007FFCD2441000-memory.dmp

Filesize
10.8MB

Download
memory/5012-86-0x00007FFCD1980000-0x00007FFCD2441000-memory.dmp

Filesize
10.8MB

Download
memory/5012-89-0x00007FFCD1980000-0x00007FFCD2441000-memory.dmp

Filesize
10.8MB

Download