umbral | 4b64b08789791f49a88c79ad4c0eae5628fe7547489f958312f53c95f23403ff

Analysis

max time kernel
117s
max time network
118s
platform
windows7_x64
resource
win7-20240704-en
resource tags

arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
submitted
12-08-2024 09:36

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General

Target

citrontoppest/citrontoppest/Citronyuh.exe
Size

227KB
MD5

867db374eb53605b40be55b3c1541e3c
SHA1

26999780ea28d4902f2d4350bbbf5dab63591fd5
SHA256

ca03916c2b0b804c70ab17755265b3db48fa97480aad3494764f45a1e746bb31
SHA512

5210541fc651210c6aae04c78347db84c8e09a4f320e072f390d63fd03587d2764548ca82b41e23631457e852b093e5af3152275b636d55aa58212d6b48e14a0
SSDEEP

6144:eloZMLrIkd8g+EtXHkv/iD4emzBywvrYyhkijD6C+b8e1m8i:IoZ0L+EP8emzBywvrYyhkijD6R6

Score

10^/10

umbral credential_access execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/2812-1-0x0000000000DA0000-0x0000000000DE0000-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
2540	powershell.exe
2368	powershell.exe
2848	powershell.exe
824	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	Citronyuh.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
10	discord.com
11	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
7	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
1340	wmic.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2812	Citronyuh.exe
2540	powershell.exe
2368	powershell.exe
2848	powershell.exe
2032	powershell.exe
824	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2812	Citronyuh.exe
Token: SeIncreaseQuotaPrivilege	1352	wmic.exe
Token: SeSecurityPrivilege	1352	wmic.exe
Token: SeTakeOwnershipPrivilege	1352	wmic.exe
Token: SeLoadDriverPrivilege	1352	wmic.exe
Token: SeSystemProfilePrivilege	1352	wmic.exe
Token: SeSystemtimePrivilege	1352	wmic.exe
Token: SeProfSingleProcessPrivilege	1352	wmic.exe
Token: SeIncBasePriorityPrivilege	1352	wmic.exe
Token: SeCreatePagefilePrivilege	1352	wmic.exe
Token: SeBackupPrivilege	1352	wmic.exe
Token: SeRestorePrivilege	1352	wmic.exe
Token: SeShutdownPrivilege	1352	wmic.exe
Token: SeDebugPrivilege	1352	wmic.exe
Token: SeSystemEnvironmentPrivilege	1352	wmic.exe
Token: SeRemoteShutdownPrivilege	1352	wmic.exe
Token: SeUndockPrivilege	1352	wmic.exe
Token: SeManageVolumePrivilege	1352	wmic.exe
Token: 33	1352	wmic.exe
Token: 34	1352	wmic.exe
Token: 35	1352	wmic.exe
Token: SeIncreaseQuotaPrivilege	1352	wmic.exe
Token: SeSecurityPrivilege	1352	wmic.exe
Token: SeTakeOwnershipPrivilege	1352	wmic.exe
Token: SeLoadDriverPrivilege	1352	wmic.exe
Token: SeSystemProfilePrivilege	1352	wmic.exe
Token: SeSystemtimePrivilege	1352	wmic.exe
Token: SeProfSingleProcessPrivilege	1352	wmic.exe
Token: SeIncBasePriorityPrivilege	1352	wmic.exe
Token: SeCreatePagefilePrivilege	1352	wmic.exe
Token: SeBackupPrivilege	1352	wmic.exe
Token: SeRestorePrivilege	1352	wmic.exe
Token: SeShutdownPrivilege	1352	wmic.exe
Token: SeDebugPrivilege	1352	wmic.exe
Token: SeSystemEnvironmentPrivilege	1352	wmic.exe
Token: SeRemoteShutdownPrivilege	1352	wmic.exe
Token: SeUndockPrivilege	1352	wmic.exe
Token: SeManageVolumePrivilege	1352	wmic.exe
Token: 33	1352	wmic.exe
Token: 34	1352	wmic.exe
Token: 35	1352	wmic.exe
Token: SeDebugPrivilege	2540	powershell.exe
Token: SeDebugPrivilege	2368	powershell.exe
Token: SeDebugPrivilege	2848	powershell.exe
Token: SeDebugPrivilege	2032	powershell.exe
Token: SeIncreaseQuotaPrivilege	1708	wmic.exe
Token: SeSecurityPrivilege	1708	wmic.exe
Token: SeTakeOwnershipPrivilege	1708	wmic.exe
Token: SeLoadDriverPrivilege	1708	wmic.exe
Token: SeSystemProfilePrivilege	1708	wmic.exe
Token: SeSystemtimePrivilege	1708	wmic.exe
Token: SeProfSingleProcessPrivilege	1708	wmic.exe
Token: SeIncBasePriorityPrivilege	1708	wmic.exe
Token: SeCreatePagefilePrivilege	1708	wmic.exe
Token: SeBackupPrivilege	1708	wmic.exe
Token: SeRestorePrivilege	1708	wmic.exe
Token: SeShutdownPrivilege	1708	wmic.exe
Token: SeDebugPrivilege	1708	wmic.exe
Token: SeSystemEnvironmentPrivilege	1708	wmic.exe
Token: SeRemoteShutdownPrivilege	1708	wmic.exe
Token: SeUndockPrivilege	1708	wmic.exe
Token: SeManageVolumePrivilege	1708	wmic.exe
Token: 33	1708	wmic.exe
Token: 34	1708	wmic.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2812 wrote to memory of 1352	2812	Citronyuh.exe	31
PID 2812 wrote to memory of 1352	2812	Citronyuh.exe	31
PID 2812 wrote to memory of 1352	2812	Citronyuh.exe	31
PID 2812 wrote to memory of 2540	2812	Citronyuh.exe	34
PID 2812 wrote to memory of 2540	2812	Citronyuh.exe	34
PID 2812 wrote to memory of 2540	2812	Citronyuh.exe	34
PID 2812 wrote to memory of 2368	2812	Citronyuh.exe	36
PID 2812 wrote to memory of 2368	2812	Citronyuh.exe	36
PID 2812 wrote to memory of 2368	2812	Citronyuh.exe	36
PID 2812 wrote to memory of 2848	2812	Citronyuh.exe	38
PID 2812 wrote to memory of 2848	2812	Citronyuh.exe	38
PID 2812 wrote to memory of 2848	2812	Citronyuh.exe	38
PID 2812 wrote to memory of 2032	2812	Citronyuh.exe	40
PID 2812 wrote to memory of 2032	2812	Citronyuh.exe	40
PID 2812 wrote to memory of 2032	2812	Citronyuh.exe	40
PID 2812 wrote to memory of 1708	2812	Citronyuh.exe	42
PID 2812 wrote to memory of 1708	2812	Citronyuh.exe	42
PID 2812 wrote to memory of 1708	2812	Citronyuh.exe	42
PID 2812 wrote to memory of 2480	2812	Citronyuh.exe	44
PID 2812 wrote to memory of 2480	2812	Citronyuh.exe	44
PID 2812 wrote to memory of 2480	2812	Citronyuh.exe	44
PID 2812 wrote to memory of 2288	2812	Citronyuh.exe	46
PID 2812 wrote to memory of 2288	2812	Citronyuh.exe	46
PID 2812 wrote to memory of 2288	2812	Citronyuh.exe	46
PID 2812 wrote to memory of 824	2812	Citronyuh.exe	48
PID 2812 wrote to memory of 824	2812	Citronyuh.exe	48
PID 2812 wrote to memory of 824	2812	Citronyuh.exe	48
PID 2812 wrote to memory of 1340	2812	Citronyuh.exe	50
PID 2812 wrote to memory of 1340	2812	Citronyuh.exe	50
PID 2812 wrote to memory of 1340	2812	Citronyuh.exe	50

C:\Users\Admin\AppData\Local\Temp\citrontoppest\citrontoppest\Citronyuh.exe
"C:\Users\Admin\AppData\Local\Temp\citrontoppest\citrontoppest\Citronyuh.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2812
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1352
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\citrontoppest\citrontoppest\Citronyuh.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2540
- 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:2368
- 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:2848
- 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:2032
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1708
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2480
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:2288
- 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:824
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:1340

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

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

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
3cd1caadefd98c40a27930092e5a2af2

SHA1
d9cbec267e0eb209f16346331e942725824071bc

SHA256
dc3df73b024ac044981ff02a441f966f224111a6afeddfe040b5d20feac6f609

SHA512
1a88a4a590ffa0741c8ad436645473f83f4c281509e3c73141a14418da2feddd58bffad7a656ffead6e140dfd9d92efe53a68d3ac419322cd1e03ccb0aad4383

Download Submit
memory/824-44-0x0000000002870000-0x0000000002878000-memory.dmp

Filesize
32KB

Download
memory/2368-15-0x000000001B710000-0x000000001B9F2000-memory.dmp

Filesize
2.9MB

Download
memory/2368-16-0x0000000001F00000-0x0000000001F08000-memory.dmp

Filesize
32KB

Download
memory/2540-8-0x000000001B740000-0x000000001BA22000-memory.dmp

Filesize
2.9MB

Download
memory/2540-9-0x0000000001F80000-0x0000000001F88000-memory.dmp

Filesize
32KB

Download
memory/2812-0-0x000007FEF5103000-0x000007FEF5104000-memory.dmp

Filesize
4KB

Download
memory/2812-1-0x0000000000DA0000-0x0000000000DE0000-memory.dmp

Filesize
256KB

Download
memory/2812-2-0x000007FEF5100000-0x000007FEF5AEC000-memory.dmp

Filesize
9.9MB

Download
memory/2812-3-0x000007FEF5100000-0x000007FEF5AEC000-memory.dmp

Filesize
9.9MB

Download
memory/2812-48-0x000007FEF5100000-0x000007FEF5AEC000-memory.dmp

Filesize
9.9MB

Download