Malware Analysis Report

2024-12-08 02:39

Sample ID 240913-pkaq5a1ank
Target a20b409e022f9a4e487672ad3b9647e7bd08fe6a6917541298aff1fdb847c62d
SHA256 a20b409e022f9a4e487672ad3b9647e7bd08fe6a6917541298aff1fdb847c62d
Tags
floxif backdoor discovery persistence privilege_escalation trojan upx
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

a20b409e022f9a4e487672ad3b9647e7bd08fe6a6917541298aff1fdb847c62d

Threat Level: Known bad

The file a20b409e022f9a4e487672ad3b9647e7bd08fe6a6917541298aff1fdb847c62d was found to be: Known bad.

Malicious Activity Summary

floxif backdoor discovery persistence privilege_escalation trojan upx

Floxif, Floodfix

Detects Floxif payload

Event Triggered Execution: AppInit DLLs

ACProtect 1.3x - 1.4x DLL software

Loads dropped DLL

UPX packed file

Drops file in Program Files directory

System Location Discovery: System Language Discovery

Unsigned PE

Modifies registry class

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-09-13 12:22

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-09-13 12:22

Reported

2024-09-13 12:25

Platform

win7-20240903-en

Max time kernel

15s

Max time network

19s

Command Line

regsvr32 /s C:\Users\Admin\AppData\Local\Temp\a20b409e022f9a4e487672ad3b9647e7bd08fe6a6917541298aff1fdb847c62d.dll

Signatures

Floxif, Floodfix

backdoor trojan floxif

Detects Floxif payload

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

Event Triggered Execution: AppInit DLLs

persistence privilege_escalation

ACProtect 1.3x - 1.4x DLL software

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

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\regsvr32.exe N/A

UPX packed file

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

Drops file in Program Files directory

Description Indicator Process Target
File created C:\Program Files\Common Files\System\symsrv.dll C:\Windows\SysWOW64\regsvr32.exe N/A

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\regsvr32.exe N/A

Modifies registry class

Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{8E14549B-DB61-4309-AFA1-3578E927E935}\InprocServer32\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\a20b409e022f9a4e487672ad3b9647e7bd08fe6a6917541298aff1fdb847c62d.dll" C:\Windows\SysWOW64\regsvr32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{8E14549B-DB61-4309-AFA1-3578E927E935}\InprocServer32\ThreadingModel = "Both" C:\Windows\SysWOW64\regsvr32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{33D9A762-90C8-11D0-BD43-00A0C911CE86}\Instance\{8E14549B-DB61-4309-AFA1-3578E927E935}\FriendlyName = "virtual-audio-capturer" C:\Windows\SysWOW64\regsvr32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{8E14549B-DB61-4309-AFA1-3578E927E935} C:\Windows\SysWOW64\regsvr32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{33D9A762-90C8-11D0-BD43-00A0C911CE86}\Instance\{8E14549B-DB61-4309-AFA1-3578E927E935} C:\Windows\SysWOW64\regsvr32.exe N/A
Set value (data) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{33D9A762-90C8-11D0-BD43-00A0C911CE86}\Instance\{8E14549B-DB61-4309-AFA1-3578E927E935}\FilterData = 02000000000020000100000000000000307069330800000000000000010000000000000000000000307479330000000038000000480000006175647300001000800000aa00389b7100000000000000000000000000000000 C:\Windows\SysWOW64\regsvr32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{33D9A762-90C8-11D0-BD43-00A0C911CE86}\Instance C:\Windows\SysWOW64\regsvr32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{33D9A762-90C8-11D0-BD43-00A0C911CE86}\Instance\{8E14549B-DB61-4309-AFA1-3578E927E935}\CLSID = "{8E14549B-DB61-4309-AFA1-3578E927E935}" C:\Windows\SysWOW64\regsvr32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{8E14549B-DB61-4309-AFA1-3578E927E935}\ = "virtual-audio-capturer" C:\Windows\SysWOW64\regsvr32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{8E14549B-DB61-4309-AFA1-3578E927E935}\InprocServer32 C:\Windows\SysWOW64\regsvr32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node C:\Windows\SysWOW64\regsvr32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID C:\Windows\SysWOW64\regsvr32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{33D9A762-90C8-11D0-BD43-00A0C911CE86} C:\Windows\SysWOW64\regsvr32.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\regsvr32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2468 wrote to memory of 1600 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe
PID 2468 wrote to memory of 1600 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe
PID 2468 wrote to memory of 1600 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe
PID 2468 wrote to memory of 1600 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe
PID 2468 wrote to memory of 1600 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe
PID 2468 wrote to memory of 1600 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe
PID 2468 wrote to memory of 1600 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe

Processes

C:\Windows\system32\regsvr32.exe

regsvr32 /s C:\Users\Admin\AppData\Local\Temp\a20b409e022f9a4e487672ad3b9647e7bd08fe6a6917541298aff1fdb847c62d.dll

C:\Windows\SysWOW64\regsvr32.exe

/s C:\Users\Admin\AppData\Local\Temp\a20b409e022f9a4e487672ad3b9647e7bd08fe6a6917541298aff1fdb847c62d.dll

Network

N/A

Files

\Program Files\Common Files\System\symsrv.dll

MD5 7574cf2c64f35161ab1292e2f532aabf
SHA1 14ba3fa927a06224dfe587014299e834def4644f
SHA256 de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085
SHA512 4db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab

memory/1600-3-0x0000000010000000-0x0000000010030000-memory.dmp

memory/1600-5-0x0000000010000000-0x0000000010030000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-09-13 12:22

Reported

2024-09-13 12:25

Platform

win10v2004-20240802-en

Max time kernel

93s

Max time network

94s

Command Line

regsvr32 /s C:\Users\Admin\AppData\Local\Temp\a20b409e022f9a4e487672ad3b9647e7bd08fe6a6917541298aff1fdb847c62d.dll

Signatures

Floxif, Floodfix

backdoor trojan floxif

Detects Floxif payload

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

Event Triggered Execution: AppInit DLLs

persistence privilege_escalation

ACProtect 1.3x - 1.4x DLL software

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

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\regsvr32.exe N/A

UPX packed file

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

Drops file in Program Files directory

Description Indicator Process Target
File created C:\Program Files\Common Files\System\symsrv.dll C:\Windows\SysWOW64\regsvr32.exe N/A

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\regsvr32.exe N/A

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{33D9A762-90C8-11d0-BD43-00A0C911CE86}\Instance\{8E14549B-DB61-4309-AFA1-3578E927E935} C:\Windows\SysWOW64\regsvr32.exe N/A
Set value (data) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{33D9A762-90C8-11d0-BD43-00A0C911CE86}\Instance\{8E14549B-DB61-4309-AFA1-3578E927E935}\FilterData = 02000000000020000100000000000000307069330800000000000000010000000000000000000000307479330000000038000000480000006175647300001000800000aa00389b7100000000000000000000000000000000 C:\Windows\SysWOW64\regsvr32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{33D9A762-90C8-11D0-BD43-00A0C911CE86}\Instance\{8E14549B-DB61-4309-AFA1-3578E927E935} C:\Windows\SysWOW64\regsvr32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{33D9A762-90C8-11d0-BD43-00A0C911CE86}\Instance C:\Windows\SysWOW64\regsvr32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8E14549B-DB61-4309-AFA1-3578E927E935}\InprocServer32\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\a20b409e022f9a4e487672ad3b9647e7bd08fe6a6917541298aff1fdb847c62d.dll" C:\Windows\SysWOW64\regsvr32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8E14549B-DB61-4309-AFA1-3578E927E935}\InprocServer32\ThreadingModel = "Both" C:\Windows\SysWOW64\regsvr32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{33D9A762-90C8-11d0-BD43-00A0C911CE86}\Instance\{8E14549B-DB61-4309-AFA1-3578E927E935}\FriendlyName = "virtual-audio-capturer" C:\Windows\SysWOW64\regsvr32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8E14549B-DB61-4309-AFA1-3578E927E935}\ = "virtual-audio-capturer" C:\Windows\SysWOW64\regsvr32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{33D9A762-90C8-11D0-BD43-00A0C911CE86} C:\Windows\SysWOW64\regsvr32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node C:\Windows\SysWOW64\regsvr32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID C:\Windows\SysWOW64\regsvr32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{33D9A762-90C8-11d0-BD43-00A0C911CE86}\Instance\{8E14549B-DB61-4309-AFA1-3578E927E935}\CLSID = "{8E14549B-DB61-4309-AFA1-3578E927E935}" C:\Windows\SysWOW64\regsvr32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8E14549B-DB61-4309-AFA1-3578E927E935} C:\Windows\SysWOW64\regsvr32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8E14549B-DB61-4309-AFA1-3578E927E935}\InprocServer32 C:\Windows\SysWOW64\regsvr32.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\regsvr32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2228 wrote to memory of 2912 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe
PID 2228 wrote to memory of 2912 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe
PID 2228 wrote to memory of 2912 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe

Processes

C:\Windows\system32\regsvr32.exe

regsvr32 /s C:\Users\Admin\AppData\Local\Temp\a20b409e022f9a4e487672ad3b9647e7bd08fe6a6917541298aff1fdb847c62d.dll

C:\Windows\SysWOW64\regsvr32.exe

/s C:\Users\Admin\AppData\Local\Temp\a20b409e022f9a4e487672ad3b9647e7bd08fe6a6917541298aff1fdb847c62d.dll

Network

Country Destination Domain Proto
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 73.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 107.12.20.2.in-addr.arpa udp
US 8.8.8.8:53 81.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 43.229.111.52.in-addr.arpa udp

Files

C:\Program Files\Common Files\System\symsrv.dll

MD5 7574cf2c64f35161ab1292e2f532aabf
SHA1 14ba3fa927a06224dfe587014299e834def4644f
SHA256 de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085
SHA512 4db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab

memory/2912-4-0x0000000010000000-0x0000000010030000-memory.dmp

memory/2912-7-0x0000000010000000-0x0000000010030000-memory.dmp