umbral | 4b64b08789791f49a88c79ad4c0eae5628fe7547489f958312f53c95f23403ff

Analysis

max time kernel
143s
max time network
125s
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/Citronyuh.exe
Size

227KB
MD5

867db374eb53605b40be55b3c1541e3c
SHA1

26999780ea28d4902f2d4350bbbf5dab63591fd5
SHA256

ca03916c2b0b804c70ab17755265b3db48fa97480aad3494764f45a1e746bb31
SHA512

5210541fc651210c6aae04c78347db84c8e09a4f320e072f390d63fd03587d2764548ca82b41e23631457e852b093e5af3152275b636d55aa58212d6b48e14a0
SSDEEP

6144:eloZMLrIkd8g+EtXHkv/iD4emzBywvrYyhkijD6C+b8e1m8i:IoZ0L+EP8emzBywvrYyhkijD6R6

Score

10^/10

umbral credential_access execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral2/memory/4508-0-0x0000027D75A70000-0x0000027D75AB0000-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

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
4336	powershell.exe
212	powershell.exe
1192	powershell.exe
4896	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	Citronyuh.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
27	discord.com
28	discord.com
29	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
12	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
4068	wmic.exe

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
4508	Citronyuh.exe
4896	powershell.exe
4896	powershell.exe
4336	powershell.exe
4336	powershell.exe
212	powershell.exe
212	powershell.exe
4596	powershell.exe
4596	powershell.exe
1192	powershell.exe
1192	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	4508	Citronyuh.exe
Token: SeIncreaseQuotaPrivilege	3304	wmic.exe
Token: SeSecurityPrivilege	3304	wmic.exe
Token: SeTakeOwnershipPrivilege	3304	wmic.exe
Token: SeLoadDriverPrivilege	3304	wmic.exe
Token: SeSystemProfilePrivilege	3304	wmic.exe
Token: SeSystemtimePrivilege	3304	wmic.exe
Token: SeProfSingleProcessPrivilege	3304	wmic.exe
Token: SeIncBasePriorityPrivilege	3304	wmic.exe
Token: SeCreatePagefilePrivilege	3304	wmic.exe
Token: SeBackupPrivilege	3304	wmic.exe
Token: SeRestorePrivilege	3304	wmic.exe
Token: SeShutdownPrivilege	3304	wmic.exe
Token: SeDebugPrivilege	3304	wmic.exe
Token: SeSystemEnvironmentPrivilege	3304	wmic.exe
Token: SeRemoteShutdownPrivilege	3304	wmic.exe
Token: SeUndockPrivilege	3304	wmic.exe
Token: SeManageVolumePrivilege	3304	wmic.exe
Token: 33	3304	wmic.exe
Token: 34	3304	wmic.exe
Token: 35	3304	wmic.exe
Token: 36	3304	wmic.exe
Token: SeIncreaseQuotaPrivilege	3304	wmic.exe
Token: SeSecurityPrivilege	3304	wmic.exe
Token: SeTakeOwnershipPrivilege	3304	wmic.exe
Token: SeLoadDriverPrivilege	3304	wmic.exe
Token: SeSystemProfilePrivilege	3304	wmic.exe
Token: SeSystemtimePrivilege	3304	wmic.exe
Token: SeProfSingleProcessPrivilege	3304	wmic.exe
Token: SeIncBasePriorityPrivilege	3304	wmic.exe
Token: SeCreatePagefilePrivilege	3304	wmic.exe
Token: SeBackupPrivilege	3304	wmic.exe
Token: SeRestorePrivilege	3304	wmic.exe
Token: SeShutdownPrivilege	3304	wmic.exe
Token: SeDebugPrivilege	3304	wmic.exe
Token: SeSystemEnvironmentPrivilege	3304	wmic.exe
Token: SeRemoteShutdownPrivilege	3304	wmic.exe
Token: SeUndockPrivilege	3304	wmic.exe
Token: SeManageVolumePrivilege	3304	wmic.exe
Token: 33	3304	wmic.exe
Token: 34	3304	wmic.exe
Token: 35	3304	wmic.exe
Token: 36	3304	wmic.exe
Token: SeDebugPrivilege	4896	powershell.exe
Token: SeDebugPrivilege	4336	powershell.exe
Token: SeDebugPrivilege	212	powershell.exe
Token: SeDebugPrivilege	4596	powershell.exe
Token: SeIncreaseQuotaPrivilege	1520	wmic.exe
Token: SeSecurityPrivilege	1520	wmic.exe
Token: SeTakeOwnershipPrivilege	1520	wmic.exe
Token: SeLoadDriverPrivilege	1520	wmic.exe
Token: SeSystemProfilePrivilege	1520	wmic.exe
Token: SeSystemtimePrivilege	1520	wmic.exe
Token: SeProfSingleProcessPrivilege	1520	wmic.exe
Token: SeIncBasePriorityPrivilege	1520	wmic.exe
Token: SeCreatePagefilePrivilege	1520	wmic.exe
Token: SeBackupPrivilege	1520	wmic.exe
Token: SeRestorePrivilege	1520	wmic.exe
Token: SeShutdownPrivilege	1520	wmic.exe
Token: SeDebugPrivilege	1520	wmic.exe
Token: SeSystemEnvironmentPrivilege	1520	wmic.exe
Token: SeRemoteShutdownPrivilege	1520	wmic.exe
Token: SeUndockPrivilege	1520	wmic.exe
Token: SeManageVolumePrivilege	1520	wmic.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 4508 wrote to memory of 3304	4508	Citronyuh.exe	87
PID 4508 wrote to memory of 3304	4508	Citronyuh.exe	87
PID 4508 wrote to memory of 4896	4508	Citronyuh.exe	90
PID 4508 wrote to memory of 4896	4508	Citronyuh.exe	90
PID 4508 wrote to memory of 4336	4508	Citronyuh.exe	92
PID 4508 wrote to memory of 4336	4508	Citronyuh.exe	92
PID 4508 wrote to memory of 212	4508	Citronyuh.exe	94
PID 4508 wrote to memory of 212	4508	Citronyuh.exe	94
PID 4508 wrote to memory of 4596	4508	Citronyuh.exe	96
PID 4508 wrote to memory of 4596	4508	Citronyuh.exe	96
PID 4508 wrote to memory of 1520	4508	Citronyuh.exe	98
PID 4508 wrote to memory of 1520	4508	Citronyuh.exe	98
PID 4508 wrote to memory of 1504	4508	Citronyuh.exe	100
PID 4508 wrote to memory of 1504	4508	Citronyuh.exe	100
PID 4508 wrote to memory of 1108	4508	Citronyuh.exe	102
PID 4508 wrote to memory of 1108	4508	Citronyuh.exe	102
PID 4508 wrote to memory of 1192	4508	Citronyuh.exe	104
PID 4508 wrote to memory of 1192	4508	Citronyuh.exe	104
PID 4508 wrote to memory of 4068	4508	Citronyuh.exe	106
PID 4508 wrote to memory of 4068	4508	Citronyuh.exe	106

C:\Users\Admin\AppData\Local\Temp\citrontoppest\citrontoppest\Citronyuh.exe
"C:\Users\Admin\AppData\Local\Temp\citrontoppest\citrontoppest\Citronyuh.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4508
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3304
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\citrontoppest\citrontoppest\Citronyuh.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4896
- 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:4336
- 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:212
- 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:4596
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1520
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:1504
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1108
- 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:1192
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:4068

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

Replay Monitor

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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
6d3e9c29fe44e90aae6ed30ccf799ca8

SHA1
c7974ef72264bbdf13a2793ccf1aed11bc565dce

SHA256
2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d

SHA512
60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

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
276798eeb29a49dc6e199768bc9c2e71

SHA1
5fdc8ccb897ac2df7476fbb07517aca5b7a6205b

SHA256
cd0a1056e8f1b6cb5cb328532239d802f4e2aa8f8fcdc0fcb487684bd68e0dcc

SHA512
0d34fce64bbefc57d64fa6e03ca886952263d5f24df9c1c4cce6a1e8f5a47a9a21e9820f8d38caa7f7b43a52336ce00b738ea18419aaa7c788b72e04ce19e4f2

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

Filesize
1KB

MD5
08e2b6dc039d66a6bfa02fbaa9b86e1f

SHA1
1a45a88b900fc97183e50e3dd95deb5c086e2ca7

SHA256
13f0b2febb094f7d558d4325d06807162326f65290c90fa52fa1d3e4e4b35b14

SHA512
2e818787d6067890ec8586f9e4c2d459632e09c167749ff1b58fcaa273850b0ca61f0a468eda65a71358daa36a69ec7961b07cffe6ebcd7b8f79b2b796402891

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_cwyfg5n4.bee.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/4508-71-0x0000027D760E0000-0x0000027D760EA000-memory.dmp

Filesize
40KB

Download
memory/4508-35-0x0000027D782B0000-0x0000027D782CE000-memory.dmp

Filesize
120KB

Download
memory/4508-92-0x00007FFDB9DB0000-0x00007FFDBA871000-memory.dmp

Filesize
10.8MB

Download
memory/4508-88-0x00007FFDB9DB0000-0x00007FFDBA871000-memory.dmp

Filesize
10.8MB

Download
memory/4508-2-0x00007FFDB9DB0000-0x00007FFDBA871000-memory.dmp

Filesize
10.8MB

Download
memory/4508-33-0x0000027D78230000-0x0000027D782A6000-memory.dmp

Filesize
472KB

Download
memory/4508-34-0x0000027D781B0000-0x0000027D78200000-memory.dmp

Filesize
320KB

Download
memory/4508-87-0x00007FFDB9DB3000-0x00007FFDB9DB5000-memory.dmp

Filesize
8KB

Download
memory/4508-1-0x00007FFDB9DB3000-0x00007FFDB9DB5000-memory.dmp

Filesize
8KB

Download
memory/4508-0-0x0000027D75A70000-0x0000027D75AB0000-memory.dmp

Filesize
256KB

Download
memory/4508-72-0x0000027D78080000-0x0000027D78092000-memory.dmp

Filesize
72KB

Download
memory/4896-8-0x00007FFDB9DB0000-0x00007FFDBA871000-memory.dmp

Filesize
10.8MB

Download
memory/4896-13-0x0000024AD7950000-0x0000024AD7972000-memory.dmp

Filesize
136KB

Download
memory/4896-15-0x00007FFDB9DB0000-0x00007FFDBA871000-memory.dmp

Filesize
10.8MB

Download
memory/4896-14-0x00007FFDB9DB0000-0x00007FFDBA871000-memory.dmp

Filesize
10.8MB

Download
memory/4896-18-0x00007FFDB9DB0000-0x00007FFDBA871000-memory.dmp

Filesize
10.8MB

Download