Malware Analysis Report

2024-12-08 02:46

Sample ID 240817-kf8edawgkg
Target 99a9637b505462239de2e2c00593bdc0N.exe
SHA256 42cac0ea845e7a85249d5f9120926a2ecf6811014c4cdbdef020e4ab008b0bf3
Tags
floxif backdoor discovery trojan upx
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

42cac0ea845e7a85249d5f9120926a2ecf6811014c4cdbdef020e4ab008b0bf3

Threat Level: Known bad

The file 99a9637b505462239de2e2c00593bdc0N.exe was found to be: Known bad.

Malicious Activity Summary

floxif backdoor discovery trojan upx

Floxif, Floodfix

Detects Floxif payload

Blocklisted process makes network request

UPX packed file

ACProtect 1.3x - 1.4x DLL software

Loads dropped DLL

Enumerates connected drives

Drops file in Program Files directory

Unsigned PE

Program crash

System Location Discovery: System Language Discovery

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-17 08:33

Signatures

UPX packed file

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

Unsigned PE

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

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-17 08:33

Reported

2024-08-17 08:35

Platform

win10v2004-20240802-en

Max time kernel

98s

Max time network

98s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\99a9637b505462239de2e2c00593bdc0N.dll,#1

Signatures

Floxif, Floodfix

backdoor trojan floxif

Detects Floxif payload

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

Blocklisted process makes network request

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

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

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
N/A N/A N/A N/A
N/A N/A N/A N/A

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\e: C:\Windows\SysWOW64\rundll32.exe N/A

Drops file in Program Files directory

Description Indicator Process Target
File created \??\c:\program files\common files\system\symsrv.dll.000 C:\Windows\SysWOW64\rundll32.exe N/A
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 behavior: EnumeratesProcesses

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

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 2184 wrote to memory of 2164 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2184 wrote to memory of 2164 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2184 wrote to memory of 2164 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\99a9637b505462239de2e2c00593bdc0N.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\99a9637b505462239de2e2c00593bdc0N.dll,#1

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 5isohu.com udp
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 8.8.8.8:53 81.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 www.aieov.com udp
US 173.255.194.134:80 www.aieov.com tcp
US 8.8.8.8:53 134.194.255.173.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 4.159.190.20.in-addr.arpa udp
US 173.255.194.134:80 www.aieov.com tcp
US 8.8.8.8:53 5isohu.com udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 14.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
US 8.8.8.8:53 10.28.171.150.in-addr.arpa udp

Files

memory/2164-0-0x0000000000400000-0x0000000000417000-memory.dmp

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

MD5 7574cf2c64f35161ab1292e2f532aabf
SHA1 14ba3fa927a06224dfe587014299e834def4644f
SHA256 de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085
SHA512 4db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab

memory/2164-3-0x0000000010000000-0x0000000010030000-memory.dmp

memory/2164-6-0x0000000000414000-0x0000000000415000-memory.dmp

memory/2164-9-0x0000000000400000-0x0000000000417000-memory.dmp

memory/2164-13-0x0000000010000000-0x0000000010030000-memory.dmp

memory/2164-12-0x0000000000400000-0x0000000000417000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-17 08:33

Reported

2024-08-17 08:35

Platform

win7-20240705-en

Max time kernel

117s

Max time network

118s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\99a9637b505462239de2e2c00593bdc0N.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

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
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\99a9637b505462239de2e2c00593bdc0N.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\99a9637b505462239de2e2c00593bdc0N.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1980 -s 332

Network

N/A

Files

memory/1980-1-0x00000000001F0000-0x0000000000207000-memory.dmp

memory/1980-0-0x00000000001F0000-0x0000000000207000-memory.dmp

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

MD5 7574cf2c64f35161ab1292e2f532aabf
SHA1 14ba3fa927a06224dfe587014299e834def4644f
SHA256 de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085
SHA512 4db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab

memory/1980-5-0x0000000010000000-0x0000000010030000-memory.dmp

memory/1980-6-0x0000000000204000-0x0000000000205000-memory.dmp

memory/1980-8-0x00000000001F0000-0x0000000000207000-memory.dmp

memory/1980-9-0x0000000010000000-0x0000000010030000-memory.dmp