umbral | bb6f9600b07d01beeab0a868840ceea944a90d87fb5016ba71794ef68d0a19d6

Analysis

max time kernel
440s
max time network
441s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-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
behavioral2/memory/3028-0-0x000001E6A9B30000-0x000001E6A9B70000-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
1760	powershell.exe
3272	powershell.exe
216	powershell.exe
3408	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
25	discord.com
26	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
3	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
4380	wmic.exe

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
3028	citronforyou.exe
1760	powershell.exe
1760	powershell.exe
3272	powershell.exe
3272	powershell.exe
216	powershell.exe
216	powershell.exe
4336	powershell.exe
4336	powershell.exe
3408	powershell.exe
3408	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	3028	citronforyou.exe
Token: SeIncreaseQuotaPrivilege	316	wmic.exe
Token: SeSecurityPrivilege	316	wmic.exe
Token: SeTakeOwnershipPrivilege	316	wmic.exe
Token: SeLoadDriverPrivilege	316	wmic.exe
Token: SeSystemProfilePrivilege	316	wmic.exe
Token: SeSystemtimePrivilege	316	wmic.exe
Token: SeProfSingleProcessPrivilege	316	wmic.exe
Token: SeIncBasePriorityPrivilege	316	wmic.exe
Token: SeCreatePagefilePrivilege	316	wmic.exe
Token: SeBackupPrivilege	316	wmic.exe
Token: SeRestorePrivilege	316	wmic.exe
Token: SeShutdownPrivilege	316	wmic.exe
Token: SeDebugPrivilege	316	wmic.exe
Token: SeSystemEnvironmentPrivilege	316	wmic.exe
Token: SeRemoteShutdownPrivilege	316	wmic.exe
Token: SeUndockPrivilege	316	wmic.exe
Token: SeManageVolumePrivilege	316	wmic.exe
Token: 33	316	wmic.exe
Token: 34	316	wmic.exe
Token: 35	316	wmic.exe
Token: 36	316	wmic.exe
Token: SeIncreaseQuotaPrivilege	316	wmic.exe
Token: SeSecurityPrivilege	316	wmic.exe
Token: SeTakeOwnershipPrivilege	316	wmic.exe
Token: SeLoadDriverPrivilege	316	wmic.exe
Token: SeSystemProfilePrivilege	316	wmic.exe
Token: SeSystemtimePrivilege	316	wmic.exe
Token: SeProfSingleProcessPrivilege	316	wmic.exe
Token: SeIncBasePriorityPrivilege	316	wmic.exe
Token: SeCreatePagefilePrivilege	316	wmic.exe
Token: SeBackupPrivilege	316	wmic.exe
Token: SeRestorePrivilege	316	wmic.exe
Token: SeShutdownPrivilege	316	wmic.exe
Token: SeDebugPrivilege	316	wmic.exe
Token: SeSystemEnvironmentPrivilege	316	wmic.exe
Token: SeRemoteShutdownPrivilege	316	wmic.exe
Token: SeUndockPrivilege	316	wmic.exe
Token: SeManageVolumePrivilege	316	wmic.exe
Token: 33	316	wmic.exe
Token: 34	316	wmic.exe
Token: 35	316	wmic.exe
Token: 36	316	wmic.exe
Token: SeDebugPrivilege	1760	powershell.exe
Token: SeDebugPrivilege	3272	powershell.exe
Token: SeDebugPrivilege	216	powershell.exe
Token: SeDebugPrivilege	4336	powershell.exe
Token: SeIncreaseQuotaPrivilege	5036	wmic.exe
Token: SeSecurityPrivilege	5036	wmic.exe
Token: SeTakeOwnershipPrivilege	5036	wmic.exe
Token: SeLoadDriverPrivilege	5036	wmic.exe
Token: SeSystemProfilePrivilege	5036	wmic.exe
Token: SeSystemtimePrivilege	5036	wmic.exe
Token: SeProfSingleProcessPrivilege	5036	wmic.exe
Token: SeIncBasePriorityPrivilege	5036	wmic.exe
Token: SeCreatePagefilePrivilege	5036	wmic.exe
Token: SeBackupPrivilege	5036	wmic.exe
Token: SeRestorePrivilege	5036	wmic.exe
Token: SeShutdownPrivilege	5036	wmic.exe
Token: SeDebugPrivilege	5036	wmic.exe
Token: SeSystemEnvironmentPrivilege	5036	wmic.exe
Token: SeRemoteShutdownPrivilege	5036	wmic.exe
Token: SeUndockPrivilege	5036	wmic.exe
Token: SeManageVolumePrivilege	5036	wmic.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 3028 wrote to memory of 316	3028	citronforyou.exe	85
PID 3028 wrote to memory of 316	3028	citronforyou.exe	85
PID 3028 wrote to memory of 1760	3028	citronforyou.exe	89
PID 3028 wrote to memory of 1760	3028	citronforyou.exe	89
PID 3028 wrote to memory of 3272	3028	citronforyou.exe	91
PID 3028 wrote to memory of 3272	3028	citronforyou.exe	91
PID 3028 wrote to memory of 216	3028	citronforyou.exe	93
PID 3028 wrote to memory of 216	3028	citronforyou.exe	93
PID 3028 wrote to memory of 4336	3028	citronforyou.exe	95
PID 3028 wrote to memory of 4336	3028	citronforyou.exe	95
PID 3028 wrote to memory of 5036	3028	citronforyou.exe	97
PID 3028 wrote to memory of 5036	3028	citronforyou.exe	97
PID 3028 wrote to memory of 548	3028	citronforyou.exe	99
PID 3028 wrote to memory of 548	3028	citronforyou.exe	99
PID 3028 wrote to memory of 1844	3028	citronforyou.exe	101
PID 3028 wrote to memory of 1844	3028	citronforyou.exe	101
PID 3028 wrote to memory of 3408	3028	citronforyou.exe	103
PID 3028 wrote to memory of 3408	3028	citronforyou.exe	103
PID 3028 wrote to memory of 4380	3028	citronforyou.exe	105
PID 3028 wrote to memory of 4380	3028	citronforyou.exe	105

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:3028
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:316
- 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:1760
- 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:3272
- 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:216
- 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:4336
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:5036
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:548
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1844
- 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:3408
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:4380

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\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
77d622bb1a5b250869a3238b9bc1402b

SHA1
d47f4003c2554b9dfc4c16f22460b331886b191b

SHA256
f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb

SHA512
d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

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

Filesize
948B

MD5
2af06a6b36db9473e4a7d9c7ab72b70b

SHA1
8ef34b9b961e51bdd1b8d7d9db2ec1b0a4764645

SHA256
18a2aa7e245c6732f95fb7749b2b4d29007f2c56a9c5bfbc5e3c127bdfe5f158

SHA512
3495567a5d5af94ae27be51313d9e2630c52017d808042fe0d56baa34fa1d246eb15c253d14c77c77a1d8f2f1c81680e623044ae95415b095696e7fa141ac7cf

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
7511c81925750deb7ad1b9b80eea8a8d

SHA1
6ea759b3cbd243ae11435c6d6c5ced185eb01f49

SHA256
5b49723a7773f2fe1f6093236e7b9b2c546f0873635d02346cb39535811234fa

SHA512
5f7e69316d39525d137a7a833f8c746ceef8f1b2295348393fb3244cca8b962fbaad0f7da49da453fe97e2c49b1f41f06138111ac5ff97fdc33c300350ec3a1b

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_zm4kzaxj.glu.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1760-11-0x00007FFD07610000-0x00007FFD080D1000-memory.dmp

Filesize
10.8MB

Download
memory/1760-10-0x00000213C20D0000-0x00000213C20F2000-memory.dmp

Filesize
136KB

Download
memory/1760-15-0x00007FFD07610000-0x00007FFD080D1000-memory.dmp

Filesize
10.8MB

Download
memory/1760-18-0x00007FFD07610000-0x00007FFD080D1000-memory.dmp

Filesize
10.8MB

Download
memory/1760-3-0x00007FFD07610000-0x00007FFD080D1000-memory.dmp

Filesize
10.8MB

Download
memory/3028-34-0x000001E6C4360000-0x000001E6C43B0000-memory.dmp

Filesize
320KB

Download
memory/3028-33-0x000001E6C4290000-0x000001E6C4306000-memory.dmp

Filesize
472KB

Download
memory/3028-35-0x000001E6C4320000-0x000001E6C433E000-memory.dmp

Filesize
120KB

Download
memory/3028-1-0x00007FFD07613000-0x00007FFD07615000-memory.dmp

Filesize
8KB

Download
memory/3028-0-0x000001E6A9B30000-0x000001E6A9B70000-memory.dmp

Filesize
256KB

Download
memory/3028-71-0x000001E6C4210000-0x000001E6C421A000-memory.dmp

Filesize
40KB

Download
memory/3028-72-0x000001E6C4240000-0x000001E6C4252000-memory.dmp

Filesize
72KB

Download
memory/3028-2-0x00007FFD07610000-0x00007FFD080D1000-memory.dmp

Filesize
10.8MB

Download
memory/3028-90-0x000001E6C4540000-0x000001E6C46E9000-memory.dmp

Filesize
1.7MB

Download
memory/3028-91-0x00007FFD07610000-0x00007FFD080D1000-memory.dmp

Filesize
10.8MB

Download