Malware Analysis Report

2024-12-08 02:38

Sample ID 240913-wpyr3s1ekc
Target c05e7e35ca4d90fea0b899c1e5ea5bc0N
SHA256 c8b535facbbd6cf73a9c65ae3bcdf6a94d0960756ce6411a44f3325ebfddc246
Tags
backdoor upx floxif discovery persistence privilege_escalation
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

c8b535facbbd6cf73a9c65ae3bcdf6a94d0960756ce6411a44f3325ebfddc246

Threat Level: Known bad

The file c05e7e35ca4d90fea0b899c1e5ea5bc0N was found to be: Known bad.

Malicious Activity Summary

backdoor upx floxif discovery persistence privilege_escalation

Detects Floxif payload

Floxif family

Event Triggered Execution: AppInit DLLs

ACProtect 1.3x - 1.4x DLL software

UPX packed file

System Location Discovery: System Language Discovery

Program crash

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-09-13 18:06

Signatures

Detects Floxif payload

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

Floxif family

floxif

ACProtect 1.3x - 1.4x DLL software

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

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-09-13 18:06

Reported

2024-09-13 18:08

Platform

win7-20240903-en

Max time kernel

110s

Max time network

17s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\c05e7e35ca4d90fea0b899c1e5ea5bc0N.dll,#1

Signatures

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

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\c05e7e35ca4d90fea0b899c1e5ea5bc0N.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\c05e7e35ca4d90fea0b899c1e5ea5bc0N.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 796 -s 328

Network

N/A

Files

memory/796-0-0x0000000010000000-0x0000000010030000-memory.dmp

memory/796-1-0x0000000010000000-0x0000000010030000-memory.dmp

memory/796-3-0x0000000010000000-0x0000000010030000-memory.dmp

memory/796-2-0x0000000010000000-0x0000000010030000-memory.dmp

memory/796-4-0x0000000010000000-0x0000000010030000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-09-13 18:06

Reported

2024-09-13 18:08

Platform

win10v2004-20240802-en

Max time kernel

94s

Max time network

96s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\c05e7e35ca4d90fea0b899c1e5ea5bc0N.dll,#1

Signatures

Event Triggered Execution: AppInit DLLs

persistence privilege_escalation

UPX packed file

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 244 wrote to memory of 3352 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 244 wrote to memory of 3352 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 244 wrote to memory of 3352 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\c05e7e35ca4d90fea0b899c1e5ea5bc0N.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\c05e7e35ca4d90fea0b899c1e5ea5bc0N.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 3352 -ip 3352

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 3352 -s 704

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 136.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 241.150.49.20.in-addr.arpa udp
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 240.143.123.92.in-addr.arpa udp
US 8.8.8.8:53 19.229.111.52.in-addr.arpa udp

Files

memory/3352-0-0x0000000010000000-0x0000000010030000-memory.dmp

memory/3352-1-0x0000000010000000-0x0000000010030000-memory.dmp