Malware Analysis Report

2024-12-08 02:42

Sample ID 240913-b7kb7axemp
Target bfacb9251b31be01ffbf9a6d9b092b6de5b51a20b0c9294c86b5406d8fb4fe69
SHA256 bfacb9251b31be01ffbf9a6d9b092b6de5b51a20b0c9294c86b5406d8fb4fe69
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

bfacb9251b31be01ffbf9a6d9b092b6de5b51a20b0c9294c86b5406d8fb4fe69

Threat Level: Known bad

The file bfacb9251b31be01ffbf9a6d9b092b6de5b51a20b0c9294c86b5406d8fb4fe69 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

Program crash

System Location Discovery: System Language Discovery

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-09-13 01:47

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-09-13 01:47

Reported

2024-09-13 01:49

Platform

win7-20240903-en

Max time kernel

141s

Max time network

118s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\bfacb9251b31be01ffbf9a6d9b092b6de5b51a20b0c9294c86b5406d8fb4fe69.dll,#1

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\rundll32.exe N/A
N/A N/A C:\Windows\SysWOW64\WerFault.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\rundll32.exe N/A

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Windows\SysWOW64\rundll32.exe

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\rundll32.exe N/A

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\bfacb9251b31be01ffbf9a6d9b092b6de5b51a20b0c9294c86b5406d8fb4fe69.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\bfacb9251b31be01ffbf9a6d9b092b6de5b51a20b0c9294c86b5406d8fb4fe69.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2932 -s 336

Network

Country Destination Domain Proto
US 8.8.8.8:53 5isohu.com udp
US 8.8.8.8:53 www.aieov.com udp
US 45.33.20.235:80 www.aieov.com tcp
US 45.33.20.235:80 www.aieov.com tcp
US 45.33.20.235:80 www.aieov.com tcp
US 45.33.20.235:80 www.aieov.com tcp
US 45.33.20.235:80 www.aieov.com tcp
US 45.33.20.235:80 www.aieov.com tcp

Files

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

MD5 7574cf2c64f35161ab1292e2f532aabf
SHA1 14ba3fa927a06224dfe587014299e834def4644f
SHA256 de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085
SHA512 4db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab

memory/2932-3-0x00000000006C0000-0x00000000006F0000-memory.dmp

memory/2932-8-0x00000000006C0000-0x00000000006F0000-memory.dmp

memory/2932-6-0x0000000010000000-0x000000001017E000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-09-13 01:47

Reported

2024-09-13 01:49

Platform

win10v2004-20240802-en

Max time kernel

94s

Max time network

123s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\bfacb9251b31be01ffbf9a6d9b092b6de5b51a20b0c9294c86b5406d8fb4fe69.dll,#1

Signatures

Floxif, Floodfix

backdoor trojan floxif

Detects Floxif payload

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

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\rundll32.exe N/A
N/A N/A C:\Windows\SysWOW64\rundll32.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
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\rundll32.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\rundll32.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 432 wrote to memory of 4784 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 432 wrote to memory of 4784 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 432 wrote to memory of 4784 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\bfacb9251b31be01ffbf9a6d9b092b6de5b51a20b0c9294c86b5406d8fb4fe69.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\bfacb9251b31be01ffbf9a6d9b092b6de5b51a20b0c9294c86b5406d8fb4fe69.dll,#1

Network

Country Destination Domain Proto
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 10.28.171.150.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 72.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 149.220.183.52.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 0.205.248.87.in-addr.arpa udp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp

Files

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

MD5 7574cf2c64f35161ab1292e2f532aabf
SHA1 14ba3fa927a06224dfe587014299e834def4644f
SHA256 de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085
SHA512 4db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab

memory/4784-7-0x0000000002BF0000-0x0000000002C20000-memory.dmp

memory/4784-6-0x0000000002BF0000-0x0000000002C20000-memory.dmp

memory/4784-8-0x0000000010001000-0x0000000010002000-memory.dmp

memory/4784-10-0x0000000002BF0000-0x0000000002C20000-memory.dmp