umbral | 4b64b08789791f49a88c79ad4c0eae5628fe7547489f958312f53c95f23403ff

Analysis

max time kernel
144s
max time network
130s
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 09:27

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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/2760-1-0x000001A07AE00000-0x000001A07AE40000-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
4604	powershell.exe
3188	powershell.exe
472	powershell.exe
2244	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
30	discord.com
31	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
8	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2064	wmic.exe

Suspicious behavior: EnumeratesProcesses 16 IoCs

pid	Process
2760	updatecheckercitron.exe
4604	powershell.exe
4604	powershell.exe
4604	powershell.exe
3188	powershell.exe
3188	powershell.exe
3188	powershell.exe
472	powershell.exe
472	powershell.exe
472	powershell.exe
2124	powershell.exe
2124	powershell.exe
2124	powershell.exe
2244	powershell.exe
2244	powershell.exe
2244	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2760	updatecheckercitron.exe
Token: SeIncreaseQuotaPrivilege	976	wmic.exe
Token: SeSecurityPrivilege	976	wmic.exe
Token: SeTakeOwnershipPrivilege	976	wmic.exe
Token: SeLoadDriverPrivilege	976	wmic.exe
Token: SeSystemProfilePrivilege	976	wmic.exe
Token: SeSystemtimePrivilege	976	wmic.exe
Token: SeProfSingleProcessPrivilege	976	wmic.exe
Token: SeIncBasePriorityPrivilege	976	wmic.exe
Token: SeCreatePagefilePrivilege	976	wmic.exe
Token: SeBackupPrivilege	976	wmic.exe
Token: SeRestorePrivilege	976	wmic.exe
Token: SeShutdownPrivilege	976	wmic.exe
Token: SeDebugPrivilege	976	wmic.exe
Token: SeSystemEnvironmentPrivilege	976	wmic.exe
Token: SeRemoteShutdownPrivilege	976	wmic.exe
Token: SeUndockPrivilege	976	wmic.exe
Token: SeManageVolumePrivilege	976	wmic.exe
Token: 33	976	wmic.exe
Token: 34	976	wmic.exe
Token: 35	976	wmic.exe
Token: 36	976	wmic.exe
Token: SeIncreaseQuotaPrivilege	976	wmic.exe
Token: SeSecurityPrivilege	976	wmic.exe
Token: SeTakeOwnershipPrivilege	976	wmic.exe
Token: SeLoadDriverPrivilege	976	wmic.exe
Token: SeSystemProfilePrivilege	976	wmic.exe
Token: SeSystemtimePrivilege	976	wmic.exe
Token: SeProfSingleProcessPrivilege	976	wmic.exe
Token: SeIncBasePriorityPrivilege	976	wmic.exe
Token: SeCreatePagefilePrivilege	976	wmic.exe
Token: SeBackupPrivilege	976	wmic.exe
Token: SeRestorePrivilege	976	wmic.exe
Token: SeShutdownPrivilege	976	wmic.exe
Token: SeDebugPrivilege	976	wmic.exe
Token: SeSystemEnvironmentPrivilege	976	wmic.exe
Token: SeRemoteShutdownPrivilege	976	wmic.exe
Token: SeUndockPrivilege	976	wmic.exe
Token: SeManageVolumePrivilege	976	wmic.exe
Token: 33	976	wmic.exe
Token: 34	976	wmic.exe
Token: 35	976	wmic.exe
Token: 36	976	wmic.exe
Token: SeDebugPrivilege	4604	powershell.exe
Token: SeDebugPrivilege	3188	powershell.exe
Token: SeDebugPrivilege	472	powershell.exe
Token: SeDebugPrivilege	2124	powershell.exe
Token: SeIncreaseQuotaPrivilege	2144	wmic.exe
Token: SeSecurityPrivilege	2144	wmic.exe
Token: SeTakeOwnershipPrivilege	2144	wmic.exe
Token: SeLoadDriverPrivilege	2144	wmic.exe
Token: SeSystemProfilePrivilege	2144	wmic.exe
Token: SeSystemtimePrivilege	2144	wmic.exe
Token: SeProfSingleProcessPrivilege	2144	wmic.exe
Token: SeIncBasePriorityPrivilege	2144	wmic.exe
Token: SeCreatePagefilePrivilege	2144	wmic.exe
Token: SeBackupPrivilege	2144	wmic.exe
Token: SeRestorePrivilege	2144	wmic.exe
Token: SeShutdownPrivilege	2144	wmic.exe
Token: SeDebugPrivilege	2144	wmic.exe
Token: SeSystemEnvironmentPrivilege	2144	wmic.exe
Token: SeRemoteShutdownPrivilege	2144	wmic.exe
Token: SeUndockPrivilege	2144	wmic.exe
Token: SeManageVolumePrivilege	2144	wmic.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2760 wrote to memory of 976	2760	updatecheckercitron.exe	92
PID 2760 wrote to memory of 976	2760	updatecheckercitron.exe	92
PID 2760 wrote to memory of 4604	2760	updatecheckercitron.exe	97
PID 2760 wrote to memory of 4604	2760	updatecheckercitron.exe	97
PID 2760 wrote to memory of 3188	2760	updatecheckercitron.exe	99
PID 2760 wrote to memory of 3188	2760	updatecheckercitron.exe	99
PID 2760 wrote to memory of 472	2760	updatecheckercitron.exe	101
PID 2760 wrote to memory of 472	2760	updatecheckercitron.exe	101
PID 2760 wrote to memory of 2124	2760	updatecheckercitron.exe	103
PID 2760 wrote to memory of 2124	2760	updatecheckercitron.exe	103
PID 2760 wrote to memory of 2144	2760	updatecheckercitron.exe	108
PID 2760 wrote to memory of 2144	2760	updatecheckercitron.exe	108
PID 2760 wrote to memory of 1776	2760	updatecheckercitron.exe	110
PID 2760 wrote to memory of 1776	2760	updatecheckercitron.exe	110
PID 2760 wrote to memory of 4828	2760	updatecheckercitron.exe	112
PID 2760 wrote to memory of 4828	2760	updatecheckercitron.exe	112
PID 2760 wrote to memory of 2244	2760	updatecheckercitron.exe	114
PID 2760 wrote to memory of 2244	2760	updatecheckercitron.exe	114
PID 2760 wrote to memory of 2064	2760	updatecheckercitron.exe	117
PID 2760 wrote to memory of 2064	2760	updatecheckercitron.exe	117

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:2760
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:976
- 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:4604
- 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:3188
- 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:472
- 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:2124
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2144
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:1776
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:4828
- 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:2244
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:2064

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4160,i,10369132178352108590,11047993562598554317,262144 --variations-seed-version --mojo-platform-channel-handle=3808 /prefetch:8
1⤵
PID:4440

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
77d622bb1a5b250869a3238b9bc1402b

SHA1
d47f4003c2554b9dfc4c16f22460b331886b191b

SHA256
f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb

SHA512
d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

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

Filesize
948B

MD5
74a6b79d36b4aae8b027a218bc6e1af7

SHA1
0350e46c1df6934903c4820a00b0bc4721779e5f

SHA256
60c64f6803d7ad1408d0a8628100470859b16ef332d5f1bd8bb2debe51251d04

SHA512
60e71435a9a23f4c144d641844f4182ddc9aa4ccd3e99232149a187112dce96458aab9587e9fea46f5dc5a52f5ca758969a04657a2b5b10241d3e4554f7c85e0

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

Filesize
1KB

MD5
548dd08570d121a65e82abb7171cae1c

SHA1
1a1b5084b3a78f3acd0d811cc79dbcac121217ab

SHA256
cdf17b8532ebcebac3cfe23954a30aa32edd268d040da79c82687e4ccb044adc

SHA512
37b98b09178b51eec9599af90d027d2f1028202efc1633047e16e41f1a95610984af5620baac07db085ccfcb96942aafffad17aa1f44f63233e83869dc9f697b

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

Filesize
1KB

MD5
5c8b5ed8fdef58d7679e54360867219d

SHA1
a17836ea8c4461d549f6ca5393babf8ad2d91ea9

SHA256
bdbdb1e47897a2fb025ccac9194a3802535a50ad0813d99e53432dcf53d8f221

SHA512
3990197f208c54918f92b9ba16671b4f881c1bdc7a8e0301645b83187965ca4aad493ac047ee7fc988067ff4f3968686ab358d8828c623247fe37ac491772aea

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_4godx0s0.qf4.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2760-68-0x000001A07CC00000-0x000001A07CC0A000-memory.dmp

Filesize
40KB

Download
memory/2760-35-0x000001A07D690000-0x000001A07D6AE000-memory.dmp

Filesize
120KB

Download
memory/2760-87-0x00007FFFB0070000-0x00007FFFB0B31000-memory.dmp

Filesize
10.8MB

Download
memory/2760-69-0x000001A07D620000-0x000001A07D632000-memory.dmp

Filesize
72KB

Download
memory/2760-2-0x00007FFFB0070000-0x00007FFFB0B31000-memory.dmp

Filesize
10.8MB

Download
memory/2760-33-0x000001A07D580000-0x000001A07D5F6000-memory.dmp

Filesize
472KB

Download
memory/2760-34-0x000001A07CC10000-0x000001A07CC60000-memory.dmp

Filesize
320KB

Download
memory/2760-1-0x000001A07AE00000-0x000001A07AE40000-memory.dmp

Filesize
256KB

Download
memory/2760-0-0x00007FFFB0073000-0x00007FFFB0075000-memory.dmp

Filesize
8KB

Download
memory/4604-15-0x00000218F3DD0000-0x00000218F3DF2000-memory.dmp

Filesize
136KB

Download
memory/4604-4-0x00007FFFB0070000-0x00007FFFB0B31000-memory.dmp

Filesize
10.8MB

Download
memory/4604-3-0x00007FFFB0070000-0x00007FFFB0B31000-memory.dmp

Filesize
10.8MB

Download
memory/4604-5-0x00007FFFB0070000-0x00007FFFB0B31000-memory.dmp

Filesize
10.8MB

Download
memory/4604-18-0x00007FFFB0070000-0x00007FFFB0B31000-memory.dmp

Filesize
10.8MB

Download