umbral | 4b64b08789791f49a88c79ad4c0eae5628fe7547489f958312f53c95f23403ff

Analysis

max time kernel
120s
max time network
123s
platform
windows7_x64
resource
win7-20240704-en
resource tags

arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
submitted
12-08-2024 09:27

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General

Target

citrontoppest/citrontoppest/citrontoppest/updatechecker/updatecheckercitron.exe
Size

227KB
MD5

a6db1722b4ed09cd06fbdf6f80df47da
SHA1

1fe86fceb4884cb37c4187591ccecd7a4c4d9c15
SHA256

ed1deb13b32c20b6cd35d50351c78d3729315dac5da6f5795dae2c14bed8520b
SHA512

61542031f6f60fca814400c9ec21c0eefa15422646c30b5b3192231a4d5a5845681f7d619818fa0c7c448f860101790d7971c80aa90637e58956b33023079785
SSDEEP

6144:+loZMLrIkd8g+EtXHkv/iD4cYiL+cCFdWQj+ctBIpHb8e1mUi:ooZ0L+EP8cYiL+cCFdWQj+ctBIhK

Score

10^/10

umbral credential_access execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral5/memory/2172-1-0x00000000012D0000-0x0000000001310000-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
2700	powershell.exe
2632	powershell.exe
648	powershell.exe
1924	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	updatecheckercitron.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
2928	wmic.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2172	updatecheckercitron.exe
2700	powershell.exe
2632	powershell.exe
648	powershell.exe
1036	powershell.exe
1924	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2172	updatecheckercitron.exe
Token: SeIncreaseQuotaPrivilege	2912	wmic.exe
Token: SeSecurityPrivilege	2912	wmic.exe
Token: SeTakeOwnershipPrivilege	2912	wmic.exe
Token: SeLoadDriverPrivilege	2912	wmic.exe
Token: SeSystemProfilePrivilege	2912	wmic.exe
Token: SeSystemtimePrivilege	2912	wmic.exe
Token: SeProfSingleProcessPrivilege	2912	wmic.exe
Token: SeIncBasePriorityPrivilege	2912	wmic.exe
Token: SeCreatePagefilePrivilege	2912	wmic.exe
Token: SeBackupPrivilege	2912	wmic.exe
Token: SeRestorePrivilege	2912	wmic.exe
Token: SeShutdownPrivilege	2912	wmic.exe
Token: SeDebugPrivilege	2912	wmic.exe
Token: SeSystemEnvironmentPrivilege	2912	wmic.exe
Token: SeRemoteShutdownPrivilege	2912	wmic.exe
Token: SeUndockPrivilege	2912	wmic.exe
Token: SeManageVolumePrivilege	2912	wmic.exe
Token: 33	2912	wmic.exe
Token: 34	2912	wmic.exe
Token: 35	2912	wmic.exe
Token: SeIncreaseQuotaPrivilege	2912	wmic.exe
Token: SeSecurityPrivilege	2912	wmic.exe
Token: SeTakeOwnershipPrivilege	2912	wmic.exe
Token: SeLoadDriverPrivilege	2912	wmic.exe
Token: SeSystemProfilePrivilege	2912	wmic.exe
Token: SeSystemtimePrivilege	2912	wmic.exe
Token: SeProfSingleProcessPrivilege	2912	wmic.exe
Token: SeIncBasePriorityPrivilege	2912	wmic.exe
Token: SeCreatePagefilePrivilege	2912	wmic.exe
Token: SeBackupPrivilege	2912	wmic.exe
Token: SeRestorePrivilege	2912	wmic.exe
Token: SeShutdownPrivilege	2912	wmic.exe
Token: SeDebugPrivilege	2912	wmic.exe
Token: SeSystemEnvironmentPrivilege	2912	wmic.exe
Token: SeRemoteShutdownPrivilege	2912	wmic.exe
Token: SeUndockPrivilege	2912	wmic.exe
Token: SeManageVolumePrivilege	2912	wmic.exe
Token: 33	2912	wmic.exe
Token: 34	2912	wmic.exe
Token: 35	2912	wmic.exe
Token: SeDebugPrivilege	2700	powershell.exe
Token: SeDebugPrivilege	2632	powershell.exe
Token: SeDebugPrivilege	648	powershell.exe
Token: SeDebugPrivilege	1036	powershell.exe
Token: SeIncreaseQuotaPrivilege	1736	wmic.exe
Token: SeSecurityPrivilege	1736	wmic.exe
Token: SeTakeOwnershipPrivilege	1736	wmic.exe
Token: SeLoadDriverPrivilege	1736	wmic.exe
Token: SeSystemProfilePrivilege	1736	wmic.exe
Token: SeSystemtimePrivilege	1736	wmic.exe
Token: SeProfSingleProcessPrivilege	1736	wmic.exe
Token: SeIncBasePriorityPrivilege	1736	wmic.exe
Token: SeCreatePagefilePrivilege	1736	wmic.exe
Token: SeBackupPrivilege	1736	wmic.exe
Token: SeRestorePrivilege	1736	wmic.exe
Token: SeShutdownPrivilege	1736	wmic.exe
Token: SeDebugPrivilege	1736	wmic.exe
Token: SeSystemEnvironmentPrivilege	1736	wmic.exe
Token: SeRemoteShutdownPrivilege	1736	wmic.exe
Token: SeUndockPrivilege	1736	wmic.exe
Token: SeManageVolumePrivilege	1736	wmic.exe
Token: 33	1736	wmic.exe
Token: 34	1736	wmic.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2172 wrote to memory of 2912	2172	updatecheckercitron.exe	30
PID 2172 wrote to memory of 2912	2172	updatecheckercitron.exe	30
PID 2172 wrote to memory of 2912	2172	updatecheckercitron.exe	30
PID 2172 wrote to memory of 2700	2172	updatecheckercitron.exe	33
PID 2172 wrote to memory of 2700	2172	updatecheckercitron.exe	33
PID 2172 wrote to memory of 2700	2172	updatecheckercitron.exe	33
PID 2172 wrote to memory of 2632	2172	updatecheckercitron.exe	35
PID 2172 wrote to memory of 2632	2172	updatecheckercitron.exe	35
PID 2172 wrote to memory of 2632	2172	updatecheckercitron.exe	35
PID 2172 wrote to memory of 648	2172	updatecheckercitron.exe	37
PID 2172 wrote to memory of 648	2172	updatecheckercitron.exe	37
PID 2172 wrote to memory of 648	2172	updatecheckercitron.exe	37
PID 2172 wrote to memory of 1036	2172	updatecheckercitron.exe	39
PID 2172 wrote to memory of 1036	2172	updatecheckercitron.exe	39
PID 2172 wrote to memory of 1036	2172	updatecheckercitron.exe	39
PID 2172 wrote to memory of 1736	2172	updatecheckercitron.exe	41
PID 2172 wrote to memory of 1736	2172	updatecheckercitron.exe	41
PID 2172 wrote to memory of 1736	2172	updatecheckercitron.exe	41
PID 2172 wrote to memory of 2020	2172	updatecheckercitron.exe	43
PID 2172 wrote to memory of 2020	2172	updatecheckercitron.exe	43
PID 2172 wrote to memory of 2020	2172	updatecheckercitron.exe	43
PID 2172 wrote to memory of 2884	2172	updatecheckercitron.exe	45
PID 2172 wrote to memory of 2884	2172	updatecheckercitron.exe	45
PID 2172 wrote to memory of 2884	2172	updatecheckercitron.exe	45
PID 2172 wrote to memory of 1924	2172	updatecheckercitron.exe	47
PID 2172 wrote to memory of 1924	2172	updatecheckercitron.exe	47
PID 2172 wrote to memory of 1924	2172	updatecheckercitron.exe	47
PID 2172 wrote to memory of 2928	2172	updatecheckercitron.exe	49
PID 2172 wrote to memory of 2928	2172	updatecheckercitron.exe	49
PID 2172 wrote to memory of 2928	2172	updatecheckercitron.exe	49

C:\Users\Admin\AppData\Local\Temp\citrontoppest\citrontoppest\citrontoppest\updatechecker\updatecheckercitron.exe
"C:\Users\Admin\AppData\Local\Temp\citrontoppest\citrontoppest\citrontoppest\updatechecker\updatecheckercitron.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2172
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2912
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\citrontoppest\citrontoppest\citrontoppest\updatechecker\updatecheckercitron.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2700
- 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:2632
- 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:648
- 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:1036
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1736
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2020
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:2884
- 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:1924
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:2928

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
f0b39660674fe7eb69d49521866614d7

SHA1
25aca0b0ea902e43b4960162196961a3f27b3e6d

SHA256
fb478948c143f5cdff0edb0781a376ff1216852c031341391b1aede8b59cd163

SHA512
83d0eafb6eeff5e4cb0389595b89b6fd999979ab1db2bcced7f55eafa79b9b6969e1857891c64185019bf6fa587c4f6bf5bb1d44c8f8d8359391e16e28641e24

Download Submit
memory/1924-44-0x00000000027E0000-0x00000000027E8000-memory.dmp

Filesize
32KB

Download
memory/2172-0-0x000007FEF5013000-0x000007FEF5014000-memory.dmp

Filesize
4KB

Download
memory/2172-1-0x00000000012D0000-0x0000000001310000-memory.dmp

Filesize
256KB

Download
memory/2172-2-0x000007FEF5010000-0x000007FEF59FC000-memory.dmp

Filesize
9.9MB

Download
memory/2172-48-0x000007FEF5010000-0x000007FEF59FC000-memory.dmp

Filesize
9.9MB

Download
memory/2632-14-0x000000001B740000-0x000000001BA22000-memory.dmp

Filesize
2.9MB

Download
memory/2632-15-0x0000000001E80000-0x0000000001E88000-memory.dmp

Filesize
32KB

Download
memory/2700-7-0x000000001B650000-0x000000001B932000-memory.dmp

Filesize
2.9MB

Download
memory/2700-8-0x0000000002790000-0x0000000002798000-memory.dmp

Filesize
32KB

Download