umbral | bb6f9600b07d01beeab0a868840ceea944a90d87fb5016ba71794ef68d0a19d6

Analysis

max time kernel
141s
max time network
126s
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 19:27

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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
behavioral2/memory/1156-0-0x0000020E8CD70000-0x0000020E8CDB0000-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
3900	powershell.exe
4932	powershell.exe
2656	powershell.exe
2956	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
30	discord.com
31	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
5	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
1408	wmic.exe

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
1156	citronforyou.exe
2956	powershell.exe
2956	powershell.exe
2656	powershell.exe
2656	powershell.exe
3900	powershell.exe
3900	powershell.exe
3104	powershell.exe
3104	powershell.exe
4932	powershell.exe
4932	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	1156	citronforyou.exe
Token: SeIncreaseQuotaPrivilege	2504	wmic.exe
Token: SeSecurityPrivilege	2504	wmic.exe
Token: SeTakeOwnershipPrivilege	2504	wmic.exe
Token: SeLoadDriverPrivilege	2504	wmic.exe
Token: SeSystemProfilePrivilege	2504	wmic.exe
Token: SeSystemtimePrivilege	2504	wmic.exe
Token: SeProfSingleProcessPrivilege	2504	wmic.exe
Token: SeIncBasePriorityPrivilege	2504	wmic.exe
Token: SeCreatePagefilePrivilege	2504	wmic.exe
Token: SeBackupPrivilege	2504	wmic.exe
Token: SeRestorePrivilege	2504	wmic.exe
Token: SeShutdownPrivilege	2504	wmic.exe
Token: SeDebugPrivilege	2504	wmic.exe
Token: SeSystemEnvironmentPrivilege	2504	wmic.exe
Token: SeRemoteShutdownPrivilege	2504	wmic.exe
Token: SeUndockPrivilege	2504	wmic.exe
Token: SeManageVolumePrivilege	2504	wmic.exe
Token: 33	2504	wmic.exe
Token: 34	2504	wmic.exe
Token: 35	2504	wmic.exe
Token: 36	2504	wmic.exe
Token: SeIncreaseQuotaPrivilege	2504	wmic.exe
Token: SeSecurityPrivilege	2504	wmic.exe
Token: SeTakeOwnershipPrivilege	2504	wmic.exe
Token: SeLoadDriverPrivilege	2504	wmic.exe
Token: SeSystemProfilePrivilege	2504	wmic.exe
Token: SeSystemtimePrivilege	2504	wmic.exe
Token: SeProfSingleProcessPrivilege	2504	wmic.exe
Token: SeIncBasePriorityPrivilege	2504	wmic.exe
Token: SeCreatePagefilePrivilege	2504	wmic.exe
Token: SeBackupPrivilege	2504	wmic.exe
Token: SeRestorePrivilege	2504	wmic.exe
Token: SeShutdownPrivilege	2504	wmic.exe
Token: SeDebugPrivilege	2504	wmic.exe
Token: SeSystemEnvironmentPrivilege	2504	wmic.exe
Token: SeRemoteShutdownPrivilege	2504	wmic.exe
Token: SeUndockPrivilege	2504	wmic.exe
Token: SeManageVolumePrivilege	2504	wmic.exe
Token: 33	2504	wmic.exe
Token: 34	2504	wmic.exe
Token: 35	2504	wmic.exe
Token: 36	2504	wmic.exe
Token: SeDebugPrivilege	2956	powershell.exe
Token: SeDebugPrivilege	2656	powershell.exe
Token: SeDebugPrivilege	3900	powershell.exe
Token: SeDebugPrivilege	3104	powershell.exe
Token: SeIncreaseQuotaPrivilege	4224	wmic.exe
Token: SeSecurityPrivilege	4224	wmic.exe
Token: SeTakeOwnershipPrivilege	4224	wmic.exe
Token: SeLoadDriverPrivilege	4224	wmic.exe
Token: SeSystemProfilePrivilege	4224	wmic.exe
Token: SeSystemtimePrivilege	4224	wmic.exe
Token: SeProfSingleProcessPrivilege	4224	wmic.exe
Token: SeIncBasePriorityPrivilege	4224	wmic.exe
Token: SeCreatePagefilePrivilege	4224	wmic.exe
Token: SeBackupPrivilege	4224	wmic.exe
Token: SeRestorePrivilege	4224	wmic.exe
Token: SeShutdownPrivilege	4224	wmic.exe
Token: SeDebugPrivilege	4224	wmic.exe
Token: SeSystemEnvironmentPrivilege	4224	wmic.exe
Token: SeRemoteShutdownPrivilege	4224	wmic.exe
Token: SeUndockPrivilege	4224	wmic.exe
Token: SeManageVolumePrivilege	4224	wmic.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 1156 wrote to memory of 2504	1156	citronforyou.exe	85
PID 1156 wrote to memory of 2504	1156	citronforyou.exe	85
PID 1156 wrote to memory of 2956	1156	citronforyou.exe	89
PID 1156 wrote to memory of 2956	1156	citronforyou.exe	89
PID 1156 wrote to memory of 2656	1156	citronforyou.exe	91
PID 1156 wrote to memory of 2656	1156	citronforyou.exe	91
PID 1156 wrote to memory of 3900	1156	citronforyou.exe	93
PID 1156 wrote to memory of 3900	1156	citronforyou.exe	93
PID 1156 wrote to memory of 3104	1156	citronforyou.exe	95
PID 1156 wrote to memory of 3104	1156	citronforyou.exe	95
PID 1156 wrote to memory of 4224	1156	citronforyou.exe	99
PID 1156 wrote to memory of 4224	1156	citronforyou.exe	99
PID 1156 wrote to memory of 2488	1156	citronforyou.exe	101
PID 1156 wrote to memory of 2488	1156	citronforyou.exe	101
PID 1156 wrote to memory of 2392	1156	citronforyou.exe	103
PID 1156 wrote to memory of 2392	1156	citronforyou.exe	103
PID 1156 wrote to memory of 4932	1156	citronforyou.exe	105
PID 1156 wrote to memory of 4932	1156	citronforyou.exe	105
PID 1156 wrote to memory of 1408	1156	citronforyou.exe	108
PID 1156 wrote to memory of 1408	1156	citronforyou.exe	108

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:1156
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2504
- 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:2956
- 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:2656
- 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:3900
- 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:3104
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4224
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2488
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:2392
- 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:4932
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:1408

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
2e907f77659a6601fcc408274894da2e

SHA1
9f5b72abef1cd7145bf37547cdb1b9254b4efe9d

SHA256
385da35673330e21ac02545220552fe301fe54dedefbdafc097ac4342a295233

SHA512
34fa0fff24f6550f55f828541aaefe5d75c86f8f0842d54b50065e9746f9662bb7209c74c9a9571540b9855bb3851f01db613190024e89b198d485bb5dc07721

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

Filesize
948B

MD5
0b8cb2e6dd5794b6a56a4bdbbd430fd7

SHA1
2b08e348c3489c6a35761af073018e3784c12074

SHA256
bcce0d44e33747e4c39df9afbd0a4e98a47ded0188375e4dfdd94cafbb366e1f

SHA512
15ce3b588aa80899f69b0313c7e188d886bddbd09783ca732ac33f9ae8e4e017a72b6f98919f581383a4582732575e5faedb0dea87e01cf2b657424945fdf4d2

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
45ad40f012b09e141955482368549640

SHA1
3f9cd15875c1e397c3b2b5592805577ae88a96cb

SHA256
ea3b59172f1a33677f9cb3843fb4d6093b806d3a7cf2f3c6d4692f5421f656ce

SHA512
3de08f8affca1c1450088f560776cf3d65146cadac43c06eb922c7b3cea436e519966cf38458303ffeb1a58c53f8952cffda6c34216fda7594e014b516e83b33

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_gtnahbdg.2bw.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1156-0-0x0000020E8CD70000-0x0000020E8CDB0000-memory.dmp

Filesize
256KB

Download
memory/1156-35-0x0000020E8EB80000-0x0000020E8EBD0000-memory.dmp

Filesize
320KB

Download
memory/1156-91-0x00007FFAA78B0000-0x00007FFAA8371000-memory.dmp

Filesize
10.8MB

Download
memory/1156-73-0x0000020EA7500000-0x0000020EA7512000-memory.dmp

Filesize
72KB

Download
memory/1156-2-0x00007FFAA78B0000-0x00007FFAA8371000-memory.dmp

Filesize
10.8MB

Download
memory/1156-1-0x00007FFAA78B3000-0x00007FFAA78B5000-memory.dmp

Filesize
8KB

Download
memory/1156-34-0x0000020EA7580000-0x0000020EA75F6000-memory.dmp

Filesize
472KB

Download
memory/1156-72-0x0000020E8D280000-0x0000020E8D28A000-memory.dmp

Filesize
40KB

Download
memory/1156-36-0x0000020E8D250000-0x0000020E8D26E000-memory.dmp

Filesize
120KB

Download
memory/2956-3-0x00007FFAA78B0000-0x00007FFAA8371000-memory.dmp

Filesize
10.8MB

Download
memory/2956-14-0x00007FFAA78B0000-0x00007FFAA8371000-memory.dmp

Filesize
10.8MB

Download
memory/2956-15-0x00007FFAA78B0000-0x00007FFAA8371000-memory.dmp

Filesize
10.8MB

Download
memory/2956-19-0x00007FFAA78B0000-0x00007FFAA8371000-memory.dmp

Filesize
10.8MB

Download
memory/2956-13-0x000001E745B00000-0x000001E745B22000-memory.dmp

Filesize
136KB

Download
memory/2956-18-0x000001E75E030000-0x000001E75E078000-memory.dmp

Filesize
288KB

Download