umbral | bb6f9600b07d01beeab0a868840ceea944a90d87fb5016ba71794ef68d0a19d6

Analysis

max time kernel
120s
max time network
121s
platform
windows7_x64
resource
win7-20240708-en
resource tags

arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
submitted
09-08-2024 19:27

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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/1392-1-0x0000000000A50000-0x0000000000A90000-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
2852	powershell.exe
2732	powershell.exe
1900	powershell.exe
2768	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
1864	wmic.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1392	citronforyou.exe
2768	powershell.exe
2852	powershell.exe
2732	powershell.exe
1880	powershell.exe
1900	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	1392	citronforyou.exe
Token: SeIncreaseQuotaPrivilege	1980	wmic.exe
Token: SeSecurityPrivilege	1980	wmic.exe
Token: SeTakeOwnershipPrivilege	1980	wmic.exe
Token: SeLoadDriverPrivilege	1980	wmic.exe
Token: SeSystemProfilePrivilege	1980	wmic.exe
Token: SeSystemtimePrivilege	1980	wmic.exe
Token: SeProfSingleProcessPrivilege	1980	wmic.exe
Token: SeIncBasePriorityPrivilege	1980	wmic.exe
Token: SeCreatePagefilePrivilege	1980	wmic.exe
Token: SeBackupPrivilege	1980	wmic.exe
Token: SeRestorePrivilege	1980	wmic.exe
Token: SeShutdownPrivilege	1980	wmic.exe
Token: SeDebugPrivilege	1980	wmic.exe
Token: SeSystemEnvironmentPrivilege	1980	wmic.exe
Token: SeRemoteShutdownPrivilege	1980	wmic.exe
Token: SeUndockPrivilege	1980	wmic.exe
Token: SeManageVolumePrivilege	1980	wmic.exe
Token: 33	1980	wmic.exe
Token: 34	1980	wmic.exe
Token: 35	1980	wmic.exe
Token: SeIncreaseQuotaPrivilege	1980	wmic.exe
Token: SeSecurityPrivilege	1980	wmic.exe
Token: SeTakeOwnershipPrivilege	1980	wmic.exe
Token: SeLoadDriverPrivilege	1980	wmic.exe
Token: SeSystemProfilePrivilege	1980	wmic.exe
Token: SeSystemtimePrivilege	1980	wmic.exe
Token: SeProfSingleProcessPrivilege	1980	wmic.exe
Token: SeIncBasePriorityPrivilege	1980	wmic.exe
Token: SeCreatePagefilePrivilege	1980	wmic.exe
Token: SeBackupPrivilege	1980	wmic.exe
Token: SeRestorePrivilege	1980	wmic.exe
Token: SeShutdownPrivilege	1980	wmic.exe
Token: SeDebugPrivilege	1980	wmic.exe
Token: SeSystemEnvironmentPrivilege	1980	wmic.exe
Token: SeRemoteShutdownPrivilege	1980	wmic.exe
Token: SeUndockPrivilege	1980	wmic.exe
Token: SeManageVolumePrivilege	1980	wmic.exe
Token: 33	1980	wmic.exe
Token: 34	1980	wmic.exe
Token: 35	1980	wmic.exe
Token: SeDebugPrivilege	2768	powershell.exe
Token: SeDebugPrivilege	2852	powershell.exe
Token: SeDebugPrivilege	2732	powershell.exe
Token: SeDebugPrivilege	1880	powershell.exe
Token: SeIncreaseQuotaPrivilege	2688	wmic.exe
Token: SeSecurityPrivilege	2688	wmic.exe
Token: SeTakeOwnershipPrivilege	2688	wmic.exe
Token: SeLoadDriverPrivilege	2688	wmic.exe
Token: SeSystemProfilePrivilege	2688	wmic.exe
Token: SeSystemtimePrivilege	2688	wmic.exe
Token: SeProfSingleProcessPrivilege	2688	wmic.exe
Token: SeIncBasePriorityPrivilege	2688	wmic.exe
Token: SeCreatePagefilePrivilege	2688	wmic.exe
Token: SeBackupPrivilege	2688	wmic.exe
Token: SeRestorePrivilege	2688	wmic.exe
Token: SeShutdownPrivilege	2688	wmic.exe
Token: SeDebugPrivilege	2688	wmic.exe
Token: SeSystemEnvironmentPrivilege	2688	wmic.exe
Token: SeRemoteShutdownPrivilege	2688	wmic.exe
Token: SeUndockPrivilege	2688	wmic.exe
Token: SeManageVolumePrivilege	2688	wmic.exe
Token: 33	2688	wmic.exe
Token: 34	2688	wmic.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1392 wrote to memory of 1980	1392	citronforyou.exe	30
PID 1392 wrote to memory of 1980	1392	citronforyou.exe	30
PID 1392 wrote to memory of 1980	1392	citronforyou.exe	30
PID 1392 wrote to memory of 2768	1392	citronforyou.exe	33
PID 1392 wrote to memory of 2768	1392	citronforyou.exe	33
PID 1392 wrote to memory of 2768	1392	citronforyou.exe	33
PID 1392 wrote to memory of 2852	1392	citronforyou.exe	35
PID 1392 wrote to memory of 2852	1392	citronforyou.exe	35
PID 1392 wrote to memory of 2852	1392	citronforyou.exe	35
PID 1392 wrote to memory of 2732	1392	citronforyou.exe	37
PID 1392 wrote to memory of 2732	1392	citronforyou.exe	37
PID 1392 wrote to memory of 2732	1392	citronforyou.exe	37
PID 1392 wrote to memory of 1880	1392	citronforyou.exe	39
PID 1392 wrote to memory of 1880	1392	citronforyou.exe	39
PID 1392 wrote to memory of 1880	1392	citronforyou.exe	39
PID 1392 wrote to memory of 2688	1392	citronforyou.exe	41
PID 1392 wrote to memory of 2688	1392	citronforyou.exe	41
PID 1392 wrote to memory of 2688	1392	citronforyou.exe	41
PID 1392 wrote to memory of 2896	1392	citronforyou.exe	43
PID 1392 wrote to memory of 2896	1392	citronforyou.exe	43
PID 1392 wrote to memory of 2896	1392	citronforyou.exe	43
PID 1392 wrote to memory of 1924	1392	citronforyou.exe	45
PID 1392 wrote to memory of 1924	1392	citronforyou.exe	45
PID 1392 wrote to memory of 1924	1392	citronforyou.exe	45
PID 1392 wrote to memory of 1900	1392	citronforyou.exe	47
PID 1392 wrote to memory of 1900	1392	citronforyou.exe	47
PID 1392 wrote to memory of 1900	1392	citronforyou.exe	47
PID 1392 wrote to memory of 1864	1392	citronforyou.exe	49
PID 1392 wrote to memory of 1864	1392	citronforyou.exe	49
PID 1392 wrote to memory of 1864	1392	citronforyou.exe	49

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:1392
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1980
- 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:2768
- 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:2852
- 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:2732
- 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:1880
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2688
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2896
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1924
- 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:1900
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:1864

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
ae1b51f2d133af772247e3f1c00d8614

SHA1
eac5ac83729d643587776c73d387d33836886c15

SHA256
b92d21f4f1fdbf43bba132fc9159a109b53b4de32edc0b98483a9ac77b4763dd

SHA512
b725c50cc32b59d36536c3c264dec1abdead531b143c37fc261c86a35e44d2cb156cf14797d4bd2779cfd09c7ee2c2466a492a5a987f050ac9c4a144a97ad748

Download Submit
memory/1392-0-0x000007FEF5873000-0x000007FEF5874000-memory.dmp

Filesize
4KB

Download
memory/1392-1-0x0000000000A50000-0x0000000000A90000-memory.dmp

Filesize
256KB

Download
memory/1392-2-0x000007FEF5870000-0x000007FEF625C000-memory.dmp

Filesize
9.9MB

Download
memory/1392-46-0x000007FEF5870000-0x000007FEF625C000-memory.dmp

Filesize
9.9MB

Download
memory/1900-42-0x0000000002860000-0x0000000002868000-memory.dmp

Filesize
32KB

Download
memory/2768-7-0x000000001B6E0000-0x000000001B9C2000-memory.dmp

Filesize
2.9MB

Download
memory/2768-8-0x0000000002790000-0x0000000002798000-memory.dmp

Filesize
32KB

Download
memory/2852-14-0x000000001B730000-0x000000001BA12000-memory.dmp

Filesize
2.9MB

Download
memory/2852-15-0x0000000001E70000-0x0000000001E78000-memory.dmp

Filesize
32KB

Download