Malware Analysis Report

2024-11-30 10:52

Sample ID 221201-jlyaxsge95
Target 84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b
SHA256 84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b
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

84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b

Threat Level: Known bad

The file 84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b 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 WriteProcessMemory

Suspicious use of SetWindowsHookEx

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 12:22

Platform

win7-20220901-en

Max time kernel

42s

Max time network

47s

Command Line

"C:\Users\Admin\AppData\Local\Temp\84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b.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\84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b.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\84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce C:\Users\Admin\AppData\Local\Temp\84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b.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\84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b.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\84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b.exe N/A
File opened for modification C:\Windows\SysWOW64\CSRLT.EXE C:\Users\Admin\AppData\Local\Temp\84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b.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\84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b.exe

"C:\Users\Admin\AppData\Local\Temp\84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b.exe"

C:\Windows\KeyGen.exe

"C:\Windows\KeyGen.exe"

Network

N/A

Files

memory/992-54-0x0000000076561000-0x0000000076563000-memory.dmp

memory/592-55-0x0000000000000000-mapping.dmp

C:\Windows\KeyGen.exe

MD5 e3c7d489013b51c671aa79c9068a2a00
SHA1 deed13e52afcc9fd2ef326fb6b0aa4bf7fcf14be
SHA256 5ea232ac5ebca4584f8689d5a1ed466404272a5c5496f41934537504368b5da2
SHA512 18a31ffcc796d6352142374dc0e12d83b9b46d56069a5db26a38b0f6a133302f13d7064bfe9bc16e7a705aeeb2cec2d654863d92280a6085c8202a3c8096b240

memory/992-57-0x0000000001FE0000-0x0000000001FFF000-memory.dmp

memory/992-58-0x0000000001FE0000-0x0000000001FFF000-memory.dmp

memory/592-59-0x0000000000400000-0x000000000041F000-memory.dmp

memory/592-60-0x0000000000400000-0x000000000041F000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2022-12-01 07:46

Reported

2022-12-03 12:22

Platform

win10v2004-20220812-en

Max time kernel

84s

Max time network

143s

Command Line

"C:\Users\Admin\AppData\Local\Temp\84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b.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-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b.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\84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b.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\84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce C:\Users\Admin\AppData\Local\Temp\84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b.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\84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File opened for modification C:\Windows\SysWOW64\CSRLT.EXE C:\Users\Admin\AppData\Local\Temp\84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b.exe N/A
File created C:\Windows\SysWOW64\CSRLT.EXE C:\Users\Admin\AppData\Local\Temp\84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b.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\84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b.exe

"C:\Users\Admin\AppData\Local\Temp\84f1733a3efb8dd690c7c7437b967f16a0688d3b4b074e7851a056cdebf6333b.exe"

C:\Windows\KeyGen.exe

"C:\Windows\KeyGen.exe"

Network

Country Destination Domain Proto
N/A 93.184.221.240:80 tcp

Files

memory/4904-132-0x0000000000000000-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/4904-135-0x0000000000400000-0x000000000041F000-memory.dmp

memory/4904-136-0x0000000000400000-0x000000000041F000-memory.dmp