umbral | 1a4e8449edc0e1f28f95ee9eaba0129264d90168797e65c47502996b15fbcde5

Analysis

max time kernel
118s
max time network
119s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
28-12-2024 16:18

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General

Target

FN_kolt_woofer.exe
Size

229KB
MD5

88e82fa4e92eaed5b089d99ca669fbd3
SHA1

c6287977d98930e7022fc1c6dfbfc4e302b724c8
SHA256

1a4e8449edc0e1f28f95ee9eaba0129264d90168797e65c47502996b15fbcde5
SHA512

5759f49a352d54c5d6be12b9f03d15757a802bde7da91f28bdac2ccc22f1afb852e3d734e54eb2e7f2129c8c4213421f991692882a15569a93430e137c1d1e7b
SSDEEP

6144:lloZM+rIkd8g+EtXHkv/iD4T6FcHdmOhyU9va6vyvb8e1mti:noZtL+EP8T6FcHdmOhyU9va6vM/

Score

10^/10

umbral discovery execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/2112-1-0x0000000000D80000-0x0000000000DC0000-memory.dmp	family_umbral

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral
Umbral family
umbral

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
2912	powershell.exe
1932	powershell.exe
2876	powershell.exe
2212	powershell.exe

Drops file in Drivers directory 1 IoCs

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

Deletes itself 1 IoCs

pid	Process
2260	cmd.exe

Reads user/profile data of web browsers 3 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

Credentials from Web Browsers
T1555.003

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
9	discord.com
10	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
6	ip-api.com

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
2260	cmd.exe
2136	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2932	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2136	PING.EXE

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2112	FN_kolt_woofer.exe
2912	powershell.exe
1932	powershell.exe
2876	powershell.exe
2228	powershell.exe
2212	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2112	FN_kolt_woofer.exe
Token: SeIncreaseQuotaPrivilege	2256	wmic.exe
Token: SeSecurityPrivilege	2256	wmic.exe
Token: SeTakeOwnershipPrivilege	2256	wmic.exe
Token: SeLoadDriverPrivilege	2256	wmic.exe
Token: SeSystemProfilePrivilege	2256	wmic.exe
Token: SeSystemtimePrivilege	2256	wmic.exe
Token: SeProfSingleProcessPrivilege	2256	wmic.exe
Token: SeIncBasePriorityPrivilege	2256	wmic.exe
Token: SeCreatePagefilePrivilege	2256	wmic.exe
Token: SeBackupPrivilege	2256	wmic.exe
Token: SeRestorePrivilege	2256	wmic.exe
Token: SeShutdownPrivilege	2256	wmic.exe
Token: SeDebugPrivilege	2256	wmic.exe
Token: SeSystemEnvironmentPrivilege	2256	wmic.exe
Token: SeRemoteShutdownPrivilege	2256	wmic.exe
Token: SeUndockPrivilege	2256	wmic.exe
Token: SeManageVolumePrivilege	2256	wmic.exe
Token: 33	2256	wmic.exe
Token: 34	2256	wmic.exe
Token: 35	2256	wmic.exe
Token: SeIncreaseQuotaPrivilege	2256	wmic.exe
Token: SeSecurityPrivilege	2256	wmic.exe
Token: SeTakeOwnershipPrivilege	2256	wmic.exe
Token: SeLoadDriverPrivilege	2256	wmic.exe
Token: SeSystemProfilePrivilege	2256	wmic.exe
Token: SeSystemtimePrivilege	2256	wmic.exe
Token: SeProfSingleProcessPrivilege	2256	wmic.exe
Token: SeIncBasePriorityPrivilege	2256	wmic.exe
Token: SeCreatePagefilePrivilege	2256	wmic.exe
Token: SeBackupPrivilege	2256	wmic.exe
Token: SeRestorePrivilege	2256	wmic.exe
Token: SeShutdownPrivilege	2256	wmic.exe
Token: SeDebugPrivilege	2256	wmic.exe
Token: SeSystemEnvironmentPrivilege	2256	wmic.exe
Token: SeRemoteShutdownPrivilege	2256	wmic.exe
Token: SeUndockPrivilege	2256	wmic.exe
Token: SeManageVolumePrivilege	2256	wmic.exe
Token: 33	2256	wmic.exe
Token: 34	2256	wmic.exe
Token: 35	2256	wmic.exe
Token: SeDebugPrivilege	2912	powershell.exe
Token: SeDebugPrivilege	1932	powershell.exe
Token: SeDebugPrivilege	2876	powershell.exe
Token: SeDebugPrivilege	2228	powershell.exe
Token: SeIncreaseQuotaPrivilege	2828	wmic.exe
Token: SeSecurityPrivilege	2828	wmic.exe
Token: SeTakeOwnershipPrivilege	2828	wmic.exe
Token: SeLoadDriverPrivilege	2828	wmic.exe
Token: SeSystemProfilePrivilege	2828	wmic.exe
Token: SeSystemtimePrivilege	2828	wmic.exe
Token: SeProfSingleProcessPrivilege	2828	wmic.exe
Token: SeIncBasePriorityPrivilege	2828	wmic.exe
Token: SeCreatePagefilePrivilege	2828	wmic.exe
Token: SeBackupPrivilege	2828	wmic.exe
Token: SeRestorePrivilege	2828	wmic.exe
Token: SeShutdownPrivilege	2828	wmic.exe
Token: SeDebugPrivilege	2828	wmic.exe
Token: SeSystemEnvironmentPrivilege	2828	wmic.exe
Token: SeRemoteShutdownPrivilege	2828	wmic.exe
Token: SeUndockPrivilege	2828	wmic.exe
Token: SeManageVolumePrivilege	2828	wmic.exe
Token: 33	2828	wmic.exe
Token: 34	2828	wmic.exe

Suspicious use of WriteProcessMemory 39 IoCs

description	pid	Process	procid_target
PID 2112 wrote to memory of 2256	2112	FN_kolt_woofer.exe	30
PID 2112 wrote to memory of 2256	2112	FN_kolt_woofer.exe	30
PID 2112 wrote to memory of 2256	2112	FN_kolt_woofer.exe	30
PID 2112 wrote to memory of 2860	2112	FN_kolt_woofer.exe	33
PID 2112 wrote to memory of 2860	2112	FN_kolt_woofer.exe	33
PID 2112 wrote to memory of 2860	2112	FN_kolt_woofer.exe	33
PID 2112 wrote to memory of 2912	2112	FN_kolt_woofer.exe	35
PID 2112 wrote to memory of 2912	2112	FN_kolt_woofer.exe	35
PID 2112 wrote to memory of 2912	2112	FN_kolt_woofer.exe	35
PID 2112 wrote to memory of 1932	2112	FN_kolt_woofer.exe	37
PID 2112 wrote to memory of 1932	2112	FN_kolt_woofer.exe	37
PID 2112 wrote to memory of 1932	2112	FN_kolt_woofer.exe	37
PID 2112 wrote to memory of 2876	2112	FN_kolt_woofer.exe	39
PID 2112 wrote to memory of 2876	2112	FN_kolt_woofer.exe	39
PID 2112 wrote to memory of 2876	2112	FN_kolt_woofer.exe	39
PID 2112 wrote to memory of 2228	2112	FN_kolt_woofer.exe	41
PID 2112 wrote to memory of 2228	2112	FN_kolt_woofer.exe	41
PID 2112 wrote to memory of 2228	2112	FN_kolt_woofer.exe	41
PID 2112 wrote to memory of 2828	2112	FN_kolt_woofer.exe	43
PID 2112 wrote to memory of 2828	2112	FN_kolt_woofer.exe	43
PID 2112 wrote to memory of 2828	2112	FN_kolt_woofer.exe	43
PID 2112 wrote to memory of 1112	2112	FN_kolt_woofer.exe	45
PID 2112 wrote to memory of 1112	2112	FN_kolt_woofer.exe	45
PID 2112 wrote to memory of 1112	2112	FN_kolt_woofer.exe	45
PID 2112 wrote to memory of 1448	2112	FN_kolt_woofer.exe	47
PID 2112 wrote to memory of 1448	2112	FN_kolt_woofer.exe	47
PID 2112 wrote to memory of 1448	2112	FN_kolt_woofer.exe	47
PID 2112 wrote to memory of 2212	2112	FN_kolt_woofer.exe	49
PID 2112 wrote to memory of 2212	2112	FN_kolt_woofer.exe	49
PID 2112 wrote to memory of 2212	2112	FN_kolt_woofer.exe	49
PID 2112 wrote to memory of 2932	2112	FN_kolt_woofer.exe	51
PID 2112 wrote to memory of 2932	2112	FN_kolt_woofer.exe	51
PID 2112 wrote to memory of 2932	2112	FN_kolt_woofer.exe	51
PID 2112 wrote to memory of 2260	2112	FN_kolt_woofer.exe	53
PID 2112 wrote to memory of 2260	2112	FN_kolt_woofer.exe	53
PID 2112 wrote to memory of 2260	2112	FN_kolt_woofer.exe	53
PID 2260 wrote to memory of 2136	2260	cmd.exe	55
PID 2260 wrote to memory of 2136	2260	cmd.exe	55
PID 2260 wrote to memory of 2136	2260	cmd.exe	55

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2860	attrib.exe

C:\Users\Admin\AppData\Local\Temp\FN_kolt_woofer.exe
"C:\Users\Admin\AppData\Local\Temp\FN_kolt_woofer.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2112
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2256
- C:\Windows\system32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\FN_kolt_woofer.exe"
  2⤵
  - Views/modifies file attributes
  PID:2860
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\FN_kolt_woofer.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2912
- 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:1932
- 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:2876
- 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:2228
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2828
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:1112
- 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:2212
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:2932
- C:\Windows\system32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\FN_kolt_woofer.exe" && pause
  2⤵
  - Deletes itself
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:2260
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:2136

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

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

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\Roaming\Microsoft\Windows\Recent\CustomDestinations\YP3PYKWRFJA9987I5EFB.temp

Filesize
7KB

MD5
56edc90d27ce5de9ed1e042a6ac16827

SHA1
d9184bcca2251686f7375d771bd8479a3da0c001

SHA256
9e236e1201edda1e8457f4acc63340189d37e94c21cb59dd96040fc517acb5fb

SHA512
984a4f72412fbcd52f929d8a4639c462e99ecbc260309e32b124836efe30c24e8be4d1deb2abe6363f32351f09c75a5780d29c8942b43926456c523388af144c

Download Submit
memory/1932-14-0x000000001B5D0000-0x000000001B8B2000-memory.dmp

Filesize
2.9MB

Download
memory/1932-15-0x0000000002810000-0x0000000002818000-memory.dmp

Filesize
32KB

Download
memory/2112-0-0x000007FEF5A03000-0x000007FEF5A04000-memory.dmp

Filesize
4KB

Download
memory/2112-1-0x0000000000D80000-0x0000000000DC0000-memory.dmp

Filesize
256KB

Download
memory/2112-2-0x000007FEF5A00000-0x000007FEF63EC000-memory.dmp

Filesize
9.9MB

Download
memory/2112-47-0x000007FEF5A00000-0x000007FEF63EC000-memory.dmp

Filesize
9.9MB

Download
memory/2212-43-0x0000000002810000-0x0000000002818000-memory.dmp

Filesize
32KB

Download
memory/2912-7-0x000000001B540000-0x000000001B822000-memory.dmp

Filesize
2.9MB

Download
memory/2912-8-0x0000000002240000-0x0000000002248000-memory.dmp

Filesize
32KB

Download