umbral | bb6f9600b07d01beeab0a868840ceea944a90d87fb5016ba71794ef68d0a19d6

Analysis

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

arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
submitted
09-08-2024 19:19

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General

Target

citronforyou.exe
Size

229KB
MD5

67735e43b595bc948f427fbc1d4d9400
SHA1

df92217c3101826bf0ae4c8ba53e40026e64dcc3
SHA256

bb6f9600b07d01beeab0a868840ceea944a90d87fb5016ba71794ef68d0a19d6
SHA512

492b3d5372137ca3c3ad287fb84ab40ac6609eff5cf329a039f29b25c39d8c348bf547f01d6e90616e9c11593bf8f294cc73858917ca0ef2a7d03c91d6b89d14
SSDEEP

6144:lloZMLrIkd8g+EtXHkv/iD4vc/yrRiK13wBzOurcVfb8e1mki:noZ0L+EP8vc/yrRiK13wBzOurCG

Score

10^/10

umbral credential_access execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/1916-1-0x0000000000070000-0x00000000000B0000-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

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
2252	powershell.exe
2688	powershell.exe
1336	powershell.exe
2924	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	citronforyou.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
9	discord.com
10	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
6	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
492	wmic.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1916	citronforyou.exe
2924	powershell.exe
2252	powershell.exe
2688	powershell.exe
2812	powershell.exe
1336	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	1916	citronforyou.exe
Token: SeIncreaseQuotaPrivilege	2284	wmic.exe
Token: SeSecurityPrivilege	2284	wmic.exe
Token: SeTakeOwnershipPrivilege	2284	wmic.exe
Token: SeLoadDriverPrivilege	2284	wmic.exe
Token: SeSystemProfilePrivilege	2284	wmic.exe
Token: SeSystemtimePrivilege	2284	wmic.exe
Token: SeProfSingleProcessPrivilege	2284	wmic.exe
Token: SeIncBasePriorityPrivilege	2284	wmic.exe
Token: SeCreatePagefilePrivilege	2284	wmic.exe
Token: SeBackupPrivilege	2284	wmic.exe
Token: SeRestorePrivilege	2284	wmic.exe
Token: SeShutdownPrivilege	2284	wmic.exe
Token: SeDebugPrivilege	2284	wmic.exe
Token: SeSystemEnvironmentPrivilege	2284	wmic.exe
Token: SeRemoteShutdownPrivilege	2284	wmic.exe
Token: SeUndockPrivilege	2284	wmic.exe
Token: SeManageVolumePrivilege	2284	wmic.exe
Token: 33	2284	wmic.exe
Token: 34	2284	wmic.exe
Token: 35	2284	wmic.exe
Token: SeIncreaseQuotaPrivilege	2284	wmic.exe
Token: SeSecurityPrivilege	2284	wmic.exe
Token: SeTakeOwnershipPrivilege	2284	wmic.exe
Token: SeLoadDriverPrivilege	2284	wmic.exe
Token: SeSystemProfilePrivilege	2284	wmic.exe
Token: SeSystemtimePrivilege	2284	wmic.exe
Token: SeProfSingleProcessPrivilege	2284	wmic.exe
Token: SeIncBasePriorityPrivilege	2284	wmic.exe
Token: SeCreatePagefilePrivilege	2284	wmic.exe
Token: SeBackupPrivilege	2284	wmic.exe
Token: SeRestorePrivilege	2284	wmic.exe
Token: SeShutdownPrivilege	2284	wmic.exe
Token: SeDebugPrivilege	2284	wmic.exe
Token: SeSystemEnvironmentPrivilege	2284	wmic.exe
Token: SeRemoteShutdownPrivilege	2284	wmic.exe
Token: SeUndockPrivilege	2284	wmic.exe
Token: SeManageVolumePrivilege	2284	wmic.exe
Token: 33	2284	wmic.exe
Token: 34	2284	wmic.exe
Token: 35	2284	wmic.exe
Token: SeDebugPrivilege	2924	powershell.exe
Token: SeDebugPrivilege	2252	powershell.exe
Token: SeDebugPrivilege	2688	powershell.exe
Token: SeDebugPrivilege	2812	powershell.exe
Token: SeIncreaseQuotaPrivilege	2560	wmic.exe
Token: SeSecurityPrivilege	2560	wmic.exe
Token: SeTakeOwnershipPrivilege	2560	wmic.exe
Token: SeLoadDriverPrivilege	2560	wmic.exe
Token: SeSystemProfilePrivilege	2560	wmic.exe
Token: SeSystemtimePrivilege	2560	wmic.exe
Token: SeProfSingleProcessPrivilege	2560	wmic.exe
Token: SeIncBasePriorityPrivilege	2560	wmic.exe
Token: SeCreatePagefilePrivilege	2560	wmic.exe
Token: SeBackupPrivilege	2560	wmic.exe
Token: SeRestorePrivilege	2560	wmic.exe
Token: SeShutdownPrivilege	2560	wmic.exe
Token: SeDebugPrivilege	2560	wmic.exe
Token: SeSystemEnvironmentPrivilege	2560	wmic.exe
Token: SeRemoteShutdownPrivilege	2560	wmic.exe
Token: SeUndockPrivilege	2560	wmic.exe
Token: SeManageVolumePrivilege	2560	wmic.exe
Token: 33	2560	wmic.exe
Token: 34	2560	wmic.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1916 wrote to memory of 2284	1916	citronforyou.exe	28
PID 1916 wrote to memory of 2284	1916	citronforyou.exe	28
PID 1916 wrote to memory of 2284	1916	citronforyou.exe	28
PID 1916 wrote to memory of 2924	1916	citronforyou.exe	31
PID 1916 wrote to memory of 2924	1916	citronforyou.exe	31
PID 1916 wrote to memory of 2924	1916	citronforyou.exe	31
PID 1916 wrote to memory of 2252	1916	citronforyou.exe	33
PID 1916 wrote to memory of 2252	1916	citronforyou.exe	33
PID 1916 wrote to memory of 2252	1916	citronforyou.exe	33
PID 1916 wrote to memory of 2688	1916	citronforyou.exe	35
PID 1916 wrote to memory of 2688	1916	citronforyou.exe	35
PID 1916 wrote to memory of 2688	1916	citronforyou.exe	35
PID 1916 wrote to memory of 2812	1916	citronforyou.exe	37
PID 1916 wrote to memory of 2812	1916	citronforyou.exe	37
PID 1916 wrote to memory of 2812	1916	citronforyou.exe	37
PID 1916 wrote to memory of 2560	1916	citronforyou.exe	39
PID 1916 wrote to memory of 2560	1916	citronforyou.exe	39
PID 1916 wrote to memory of 2560	1916	citronforyou.exe	39
PID 1916 wrote to memory of 2352	1916	citronforyou.exe	41
PID 1916 wrote to memory of 2352	1916	citronforyou.exe	41
PID 1916 wrote to memory of 2352	1916	citronforyou.exe	41
PID 1916 wrote to memory of 1644	1916	citronforyou.exe	43
PID 1916 wrote to memory of 1644	1916	citronforyou.exe	43
PID 1916 wrote to memory of 1644	1916	citronforyou.exe	43
PID 1916 wrote to memory of 1336	1916	citronforyou.exe	45
PID 1916 wrote to memory of 1336	1916	citronforyou.exe	45
PID 1916 wrote to memory of 1336	1916	citronforyou.exe	45
PID 1916 wrote to memory of 492	1916	citronforyou.exe	47
PID 1916 wrote to memory of 492	1916	citronforyou.exe	47
PID 1916 wrote to memory of 492	1916	citronforyou.exe	47

C:\Users\Admin\AppData\Local\Temp\citronforyou.exe
"C:\Users\Admin\AppData\Local\Temp\citronforyou.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1916
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2284
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\citronforyou.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2924
- 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:2252
- 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:2688
- 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:2812
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2560
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2352
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1644
- 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:1336
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:492

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\UNE6ZV3WC20YS1EFT2OQ.temp

Filesize
7KB

MD5
d1040bc9f0b2c154c6ea3a634b5a5a00

SHA1
42640318fe2219e8579b3e7b834fba89a3152b0d

SHA256
2463a2b35c04205abfe5bde46b3c8a58c95421ac1214430563e885903c625ac2

SHA512
81ad836388c2ce94e4fb0c88093f99104cf70f598abba1e6433c7e26f3e27207c55ce61f5b4e0679e27771a2f2f9fdf402544e535df120e978b414c0f43e5344

Download Submit
memory/1336-42-0x0000000002810000-0x0000000002818000-memory.dmp

Filesize
32KB

Download
memory/1916-0-0x000007FEF62A3000-0x000007FEF62A4000-memory.dmp

Filesize
4KB

Download
memory/1916-1-0x0000000000070000-0x00000000000B0000-memory.dmp

Filesize
256KB

Download
memory/1916-2-0x000007FEF62A0000-0x000007FEF6C8C000-memory.dmp

Filesize
9.9MB

Download
memory/1916-46-0x000007FEF62A0000-0x000007FEF6C8C000-memory.dmp

Filesize
9.9MB

Download
memory/2252-14-0x000000001B5A0000-0x000000001B882000-memory.dmp

Filesize
2.9MB

Download
memory/2252-15-0x0000000001E60000-0x0000000001E68000-memory.dmp

Filesize
32KB

Download
memory/2924-7-0x000000001B650000-0x000000001B932000-memory.dmp

Filesize
2.9MB

Download
memory/2924-8-0x0000000002720000-0x0000000002728000-memory.dmp

Filesize
32KB

Download