umbral | b1256cc222fc9da457e57ce11a874e59d5c731c2aa3f55cc02cf47a9786fc775

Analysis

max time kernel
12s
max time network
14s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
24/08/2024, 21:49

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General

Target

CVW3NAX.exe
Size

428KB
MD5

11710cd62e4fb19bb1932e06d0d64d07
SHA1

807d0d38932792b545ff9fb6fe0d84ddd7094cd8
SHA256

b1256cc222fc9da457e57ce11a874e59d5c731c2aa3f55cc02cf47a9786fc775
SHA512

5a9745ac347c742ea065b9754646dbc718ad6b8e940727c6d7d6632202c1b56649c646ad549cb1406b7c57901aa9ed574ac97e8a47abf63befa3bbebc35f17e5
SSDEEP

12288:noZetlRk83MlSFLPMS1Nmezus9x4FM+H5X:r5r3VLPMS1Nmezus9x4FX

Score

10^/10

umbral credential_access execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral2/memory/2904-1-0x00000247230D0000-0x0000024723140000-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 3 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
760	powershell.exe
1316	powershell.exe
1616	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	CVW3NAX.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

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
15	ip-api.com

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
2904	CVW3NAX.exe
760	powershell.exe
760	powershell.exe
1316	powershell.exe
1316	powershell.exe
1616	powershell.exe
1616	powershell.exe
664	powershell.exe
664	powershell.exe

Suspicious use of AdjustPrivilegeToken 47 IoCs

description	pid	Process
Token: SeDebugPrivilege	2904	CVW3NAX.exe
Token: SeIncreaseQuotaPrivilege	3716	wmic.exe
Token: SeSecurityPrivilege	3716	wmic.exe
Token: SeTakeOwnershipPrivilege	3716	wmic.exe
Token: SeLoadDriverPrivilege	3716	wmic.exe
Token: SeSystemProfilePrivilege	3716	wmic.exe
Token: SeSystemtimePrivilege	3716	wmic.exe
Token: SeProfSingleProcessPrivilege	3716	wmic.exe
Token: SeIncBasePriorityPrivilege	3716	wmic.exe
Token: SeCreatePagefilePrivilege	3716	wmic.exe
Token: SeBackupPrivilege	3716	wmic.exe
Token: SeRestorePrivilege	3716	wmic.exe
Token: SeShutdownPrivilege	3716	wmic.exe
Token: SeDebugPrivilege	3716	wmic.exe
Token: SeSystemEnvironmentPrivilege	3716	wmic.exe
Token: SeRemoteShutdownPrivilege	3716	wmic.exe
Token: SeUndockPrivilege	3716	wmic.exe
Token: SeManageVolumePrivilege	3716	wmic.exe
Token: 33	3716	wmic.exe
Token: 34	3716	wmic.exe
Token: 35	3716	wmic.exe
Token: 36	3716	wmic.exe
Token: SeIncreaseQuotaPrivilege	3716	wmic.exe
Token: SeSecurityPrivilege	3716	wmic.exe
Token: SeTakeOwnershipPrivilege	3716	wmic.exe
Token: SeLoadDriverPrivilege	3716	wmic.exe
Token: SeSystemProfilePrivilege	3716	wmic.exe
Token: SeSystemtimePrivilege	3716	wmic.exe
Token: SeProfSingleProcessPrivilege	3716	wmic.exe
Token: SeIncBasePriorityPrivilege	3716	wmic.exe
Token: SeCreatePagefilePrivilege	3716	wmic.exe
Token: SeBackupPrivilege	3716	wmic.exe
Token: SeRestorePrivilege	3716	wmic.exe
Token: SeShutdownPrivilege	3716	wmic.exe
Token: SeDebugPrivilege	3716	wmic.exe
Token: SeSystemEnvironmentPrivilege	3716	wmic.exe
Token: SeRemoteShutdownPrivilege	3716	wmic.exe
Token: SeUndockPrivilege	3716	wmic.exe
Token: SeManageVolumePrivilege	3716	wmic.exe
Token: 33	3716	wmic.exe
Token: 34	3716	wmic.exe
Token: 35	3716	wmic.exe
Token: 36	3716	wmic.exe
Token: SeDebugPrivilege	760	powershell.exe
Token: SeDebugPrivilege	1316	powershell.exe
Token: SeDebugPrivilege	1616	powershell.exe
Token: SeDebugPrivilege	664	powershell.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2904 wrote to memory of 3716	2904	CVW3NAX.exe	87
PID 2904 wrote to memory of 3716	2904	CVW3NAX.exe	87
PID 2904 wrote to memory of 760	2904	CVW3NAX.exe	91
PID 2904 wrote to memory of 760	2904	CVW3NAX.exe	91
PID 2904 wrote to memory of 1316	2904	CVW3NAX.exe	93
PID 2904 wrote to memory of 1316	2904	CVW3NAX.exe	93
PID 2904 wrote to memory of 1616	2904	CVW3NAX.exe	95
PID 2904 wrote to memory of 1616	2904	CVW3NAX.exe	95
PID 2904 wrote to memory of 664	2904	CVW3NAX.exe	97
PID 2904 wrote to memory of 664	2904	CVW3NAX.exe	97

C:\Users\Admin\AppData\Local\Temp\CVW3NAX.exe
"C:\Users\Admin\AppData\Local\Temp\CVW3NAX.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2904
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3716
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\CVW3NAX.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:760
- 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:1316
- 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:1616
- 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:664

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

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

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
04e496605de2e5ab948392ad80e01d0b

SHA1
3c4ac546b1f692ff3f6f37575c5720107847cb55

SHA256
b8f97a41df1e31dbaaaff19d491a8f6350acb1d130e3775f1dd0eb212a6687f8

SHA512
79b501d33c79577903d587670d6e12377e6496d74faeaf4a2f37cbae726549db5d72df3d2a4ea3c599059e952f852a97c05cc17765fe2dfa442809ec2e6369cb

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\Temp\__PSScriptPolicyTest_zdyohfhz.a0f.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/760-10-0x0000015124010000-0x0000015124032000-memory.dmp

Filesize
136KB

Download
memory/760-14-0x00007FFD06660000-0x00007FFD07121000-memory.dmp

Filesize
10.8MB

Download
memory/760-15-0x00007FFD06660000-0x00007FFD07121000-memory.dmp

Filesize
10.8MB

Download
memory/760-18-0x00007FFD06660000-0x00007FFD07121000-memory.dmp

Filesize
10.8MB

Download
memory/760-3-0x00007FFD06660000-0x00007FFD07121000-memory.dmp

Filesize
10.8MB

Download
memory/2904-34-0x000002473D8F0000-0x000002473D940000-memory.dmp

Filesize
320KB

Download
memory/2904-33-0x000002473D870000-0x000002473D8E6000-memory.dmp

Filesize
472KB

Download
memory/2904-2-0x00007FFD06660000-0x00007FFD07121000-memory.dmp

Filesize
10.8MB

Download
memory/2904-35-0x000002473D730000-0x000002473D74E000-memory.dmp

Filesize
120KB

Download
memory/2904-0-0x00007FFD06663000-0x00007FFD06665000-memory.dmp

Filesize
8KB

Download
memory/2904-1-0x00000247230D0000-0x0000024723140000-memory.dmp

Filesize
448KB

Download
memory/2904-71-0x0000024724EB0000-0x0000024724EBA000-memory.dmp

Filesize
40KB

Download
memory/2904-72-0x000002473D6F0000-0x000002473D702000-memory.dmp

Filesize
72KB

Download
memory/2904-75-0x00007FFD06663000-0x00007FFD06665000-memory.dmp

Filesize
8KB

Download
memory/2904-76-0x00007FFD06660000-0x00007FFD07121000-memory.dmp

Filesize
10.8MB

Download
memory/2904-77-0x000002473DAC0000-0x000002473DC69000-memory.dmp

Filesize
1.7MB

Download