Malware Analysis Report

2024-11-30 10:53

Sample ID 221201-jly78aca6w
Target 6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51
SHA256 6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51
Tags
fakeav spyware fakeav persistence upx
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V6

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

6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51

Threat Level: Known bad

The file 6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51 was found to be: Known bad.

Malicious Activity Summary

fakeav spyware fakeav persistence upx

FakeAV, RogueAntivirus

FakeAV payload

Fakeav family

Executes dropped EXE

UPX packed file

Checks computer location settings

Adds Run key to start application

Drops file in System32 directory

Drops file in Windows directory

Enumerates physical storage devices

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2022-12-01 07:46

Signatures

FakeAV payload

fakeav spyware
Description Indicator Process Target
N/A N/A N/A N/A

Fakeav family

fakeav

Analysis: behavioral1

Detonation Overview

Submitted

2022-12-01 07:46

Reported

2022-12-03 12:57

Platform

win7-20220812-en

Max time kernel

36s

Max time network

42s

Command Line

"C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe"

Signatures

FakeAV, RogueAntivirus

fakeav spyware fakeav

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Windows\KeyGen.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

Adds Run key to start application

persistence
Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\CSRLT.EXE = "C:\\Windows\\system32\\CSRLT.EXE" C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\MSBLT.EXE = "C:\\Windows\\MSBLT.EXE" C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File created C:\Windows\SysWOW64\CSRLT.EXE C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe N/A
File opened for modification C:\Windows\SysWOW64\CSRLT.EXE C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe N/A

Enumerates physical storage devices

Suspicious use of SetWindowsHookEx

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

Processes

C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe

"C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe"

C:\Windows\KeyGen.exe

"C:\Windows\KeyGen.exe"

Network

N/A

Files

memory/1764-54-0x0000000075FC1000-0x0000000075FC3000-memory.dmp

C:\Windows\KeyGen.exe

MD5 e3c7d489013b51c671aa79c9068a2a00
SHA1 deed13e52afcc9fd2ef326fb6b0aa4bf7fcf14be
SHA256 5ea232ac5ebca4584f8689d5a1ed466404272a5c5496f41934537504368b5da2
SHA512 18a31ffcc796d6352142374dc0e12d83b9b46d56069a5db26a38b0f6a133302f13d7064bfe9bc16e7a705aeeb2cec2d654863d92280a6085c8202a3c8096b240

memory/2004-55-0x0000000000000000-mapping.dmp

memory/1764-57-0x0000000002D70000-0x0000000002D8F000-memory.dmp

memory/1764-58-0x0000000002D70000-0x0000000002D8F000-memory.dmp

memory/2004-59-0x0000000000400000-0x000000000041F000-memory.dmp

memory/2004-60-0x0000000000400000-0x000000000041F000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2022-12-01 07:46

Reported

2022-12-03 12:56

Platform

win10v2004-20220901-en

Max time kernel

91s

Max time network

128s

Command Line

"C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe"

Signatures

FakeAV, RogueAntivirus

fakeav spyware fakeav

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Windows\KeyGen.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

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CSRLT.EXE = "C:\\Windows\\system32\\CSRLT.EXE" C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\MSBLT.EXE = "C:\\Windows\\MSBLT.EXE" C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File created C:\Windows\SysWOW64\CSRLT.EXE C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe N/A
File opened for modification C:\Windows\SysWOW64\CSRLT.EXE C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe N/A

Enumerates physical storage devices

Suspicious use of SetWindowsHookEx

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

Processes

C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe

"C:\Users\Admin\AppData\Local\Temp\6f391d0bef76a8f7474071dca5c1b04c869c1ced53f1f9ecf8bb5e5f1d86cc51.exe"

C:\Windows\KeyGen.exe

"C:\Windows\KeyGen.exe"

Network

Country Destination Domain Proto
N/A 8.253.208.113:80 tcp
N/A 2.18.109.224:443 tcp
N/A 20.42.73.25:443 tcp
N/A 87.248.202.1:80 tcp
N/A 87.248.202.1:80 tcp
N/A 93.184.221.240:80 tcp

Files

memory/1256-132-0x0000000000000000-mapping.dmp

C:\Windows\KeyGen.exe

MD5 e3c7d489013b51c671aa79c9068a2a00
SHA1 deed13e52afcc9fd2ef326fb6b0aa4bf7fcf14be
SHA256 5ea232ac5ebca4584f8689d5a1ed466404272a5c5496f41934537504368b5da2
SHA512 18a31ffcc796d6352142374dc0e12d83b9b46d56069a5db26a38b0f6a133302f13d7064bfe9bc16e7a705aeeb2cec2d654863d92280a6085c8202a3c8096b240

C:\Windows\KeyGen.exe

MD5 e3c7d489013b51c671aa79c9068a2a00
SHA1 deed13e52afcc9fd2ef326fb6b0aa4bf7fcf14be
SHA256 5ea232ac5ebca4584f8689d5a1ed466404272a5c5496f41934537504368b5da2
SHA512 18a31ffcc796d6352142374dc0e12d83b9b46d56069a5db26a38b0f6a133302f13d7064bfe9bc16e7a705aeeb2cec2d654863d92280a6085c8202a3c8096b240

memory/1256-135-0x0000000000400000-0x000000000041F000-memory.dmp

memory/1256-136-0x0000000000400000-0x000000000041F000-memory.dmp