Malware Analysis Report

2025-04-13 12:36

Sample ID 240803-cpybrsvblg
Target flemme.exe
SHA256 5969e616a32e7cb09dd32ddca0c37e989a6131edb5c4a7b4367400c3f0e8527e
Tags
rat default asyncrat discovery
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

5969e616a32e7cb09dd32ddca0c37e989a6131edb5c4a7b4367400c3f0e8527e

Threat Level: Known bad

The file flemme.exe was found to be: Known bad.

Malicious Activity Summary

rat default asyncrat discovery

AsyncRat

Asyncrat family

Async RAT payload

Async RAT payload

Checks computer location settings

Executes dropped EXE

Loads dropped DLL

System Location Discovery: System Language Discovery

Unsigned PE

Enumerates physical storage devices

Scheduled Task/Job: Scheduled Task

Suspicious behavior: EnumeratesProcesses

Delays execution with timeout.exe

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-03 02:15

Signatures

Async RAT payload

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

Asyncrat family

asyncrat

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-03 02:15

Reported

2024-08-03 02:18

Platform

win7-20240704-en

Max time kernel

149s

Max time network

126s

Command Line

"C:\Users\Admin\AppData\Local\Temp\flemme.exe"

Signatures

AsyncRat

rat asyncrat

Async RAT payload

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

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\executorroblox.exe N/A

Loads dropped DLL

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

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\timeout.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Roaming\executorroblox.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\flemme.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\cmd.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\cmd.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\schtasks.exe N/A

Delays execution with timeout.exe

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\timeout.exe N/A

Scheduled Task/Job: Scheduled Task

persistence execution
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\schtasks.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\flemme.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\flemme.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\flemme.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\flemme.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\executorroblox.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2604 wrote to memory of 316 N/A C:\Users\Admin\AppData\Local\Temp\flemme.exe C:\Windows\SysWOW64\cmd.exe
PID 2604 wrote to memory of 316 N/A C:\Users\Admin\AppData\Local\Temp\flemme.exe C:\Windows\SysWOW64\cmd.exe
PID 2604 wrote to memory of 316 N/A C:\Users\Admin\AppData\Local\Temp\flemme.exe C:\Windows\SysWOW64\cmd.exe
PID 2604 wrote to memory of 316 N/A C:\Users\Admin\AppData\Local\Temp\flemme.exe C:\Windows\SysWOW64\cmd.exe
PID 2604 wrote to memory of 2808 N/A C:\Users\Admin\AppData\Local\Temp\flemme.exe C:\Windows\SysWOW64\cmd.exe
PID 2604 wrote to memory of 2808 N/A C:\Users\Admin\AppData\Local\Temp\flemme.exe C:\Windows\SysWOW64\cmd.exe
PID 2604 wrote to memory of 2808 N/A C:\Users\Admin\AppData\Local\Temp\flemme.exe C:\Windows\SysWOW64\cmd.exe
PID 2604 wrote to memory of 2808 N/A C:\Users\Admin\AppData\Local\Temp\flemme.exe C:\Windows\SysWOW64\cmd.exe
PID 316 wrote to memory of 2256 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 316 wrote to memory of 2256 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 316 wrote to memory of 2256 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 316 wrote to memory of 2256 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 2808 wrote to memory of 2140 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 2808 wrote to memory of 2140 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 2808 wrote to memory of 2140 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 2808 wrote to memory of 2140 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 2808 wrote to memory of 2756 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\executorroblox.exe
PID 2808 wrote to memory of 2756 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\executorroblox.exe
PID 2808 wrote to memory of 2756 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\executorroblox.exe
PID 2808 wrote to memory of 2756 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\executorroblox.exe

Processes

C:\Users\Admin\AppData\Local\Temp\flemme.exe

"C:\Users\Admin\AppData\Local\Temp\flemme.exe"

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "executorroblox" /tr '"C:\Users\Admin\AppData\Roaming\executorroblox.exe"' & exit

C:\Windows\SysWOW64\cmd.exe

cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpE2C1.tmp.bat""

C:\Windows\SysWOW64\schtasks.exe

schtasks /create /f /sc onlogon /rl highest /tn "executorroblox" /tr '"C:\Users\Admin\AppData\Roaming\executorroblox.exe"'

C:\Windows\SysWOW64\timeout.exe

timeout 3

C:\Users\Admin\AppData\Roaming\executorroblox.exe

"C:\Users\Admin\AppData\Roaming\executorroblox.exe"

Network

Country Destination Domain Proto
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:6606 tcp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:6606 tcp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:6606 tcp
N/A 127.0.0.1:6606 tcp
N/A 127.0.0.1:6606 tcp
N/A 127.0.0.1:6606 tcp
N/A 127.0.0.1:6606 tcp
N/A 127.0.0.1:6606 tcp
N/A 127.0.0.1:6606 tcp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:6606 tcp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:7707 tcp

Files

memory/2604-0-0x000000007497E000-0x000000007497F000-memory.dmp

memory/2604-1-0x0000000000320000-0x0000000000342000-memory.dmp

memory/2604-2-0x0000000074970000-0x000000007505E000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmpE2C1.tmp.bat

MD5 d001c657ff868f11c827df83ef18eec6
SHA1 6f267d7e728abcf0f0d16349254e89c2ecfb2dd1
SHA256 ab89fcf4e004ef1707a3261a8ba9582fa7cb9dc4623f6f4cc0955d0e5f10bcc9
SHA512 a73c0900a7da5df3fcce0a5bfa3779dcb564d2237f9a75291de704827ed7c45585064a2ec9d2afdac1717e5593a9f5e2de7f144d1d61d291056623d027d6347f

memory/2604-12-0x0000000074970000-0x000000007505E000-memory.dmp

\Users\Admin\AppData\Roaming\executorroblox.exe

MD5 2dd4a3e79a430fcf80e0c16c059c4c2c
SHA1 b32b851bb2746acfa2035d6765f7827e5880debb
SHA256 5969e616a32e7cb09dd32ddca0c37e989a6131edb5c4a7b4367400c3f0e8527e
SHA512 cae7ef83d8eb0f77d018dae6327b46cbb61e68623d64551492f883b9903a00ff410a9bda7c84f4348497e55b34490b315f855b95288e71710076cb246863a6a4

memory/2756-16-0x0000000001020000-0x0000000001042000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-03 02:15

Reported

2024-08-03 02:18

Platform

win10v2004-20240802-en

Max time kernel

145s

Max time network

122s

Command Line

"C:\Users\Admin\AppData\Local\Temp\flemme.exe"

Signatures

AsyncRat

rat asyncrat

Async RAT payload

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

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-1302416131-1437503476-2806442725-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\flemme.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\executorroblox.exe N/A

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\cmd.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\schtasks.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\timeout.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Roaming\executorroblox.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\flemme.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\cmd.exe N/A

Delays execution with timeout.exe

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\timeout.exe N/A

Scheduled Task/Job: Scheduled Task

persistence execution
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\schtasks.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\flemme.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\executorroblox.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 988 wrote to memory of 2316 N/A C:\Users\Admin\AppData\Local\Temp\flemme.exe C:\Windows\SysWOW64\cmd.exe
PID 988 wrote to memory of 2316 N/A C:\Users\Admin\AppData\Local\Temp\flemme.exe C:\Windows\SysWOW64\cmd.exe
PID 988 wrote to memory of 2316 N/A C:\Users\Admin\AppData\Local\Temp\flemme.exe C:\Windows\SysWOW64\cmd.exe
PID 988 wrote to memory of 3800 N/A C:\Users\Admin\AppData\Local\Temp\flemme.exe C:\Windows\SysWOW64\cmd.exe
PID 988 wrote to memory of 3800 N/A C:\Users\Admin\AppData\Local\Temp\flemme.exe C:\Windows\SysWOW64\cmd.exe
PID 988 wrote to memory of 3800 N/A C:\Users\Admin\AppData\Local\Temp\flemme.exe C:\Windows\SysWOW64\cmd.exe
PID 2316 wrote to memory of 4288 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 2316 wrote to memory of 4288 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 2316 wrote to memory of 4288 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\schtasks.exe
PID 3800 wrote to memory of 3924 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 3800 wrote to memory of 3924 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 3800 wrote to memory of 3924 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\timeout.exe
PID 3800 wrote to memory of 5000 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\executorroblox.exe
PID 3800 wrote to memory of 5000 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\executorroblox.exe
PID 3800 wrote to memory of 5000 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\executorroblox.exe

Processes

C:\Users\Admin\AppData\Local\Temp\flemme.exe

"C:\Users\Admin\AppData\Local\Temp\flemme.exe"

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "executorroblox" /tr '"C:\Users\Admin\AppData\Roaming\executorroblox.exe"' & exit

C:\Windows\SysWOW64\cmd.exe

C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpB6DC.tmp.bat""

C:\Windows\SysWOW64\schtasks.exe

schtasks /create /f /sc onlogon /rl highest /tn "executorroblox" /tr '"C:\Users\Admin\AppData\Roaming\executorroblox.exe"'

C:\Windows\SysWOW64\timeout.exe

timeout 3

C:\Users\Admin\AppData\Roaming\executorroblox.exe

"C:\Users\Admin\AppData\Roaming\executorroblox.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 73.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:6606 tcp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:6606 tcp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:6606 tcp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:6606 tcp
N/A 127.0.0.1:6606 tcp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:6606 tcp
N/A 127.0.0.1:7707 tcp
US 8.8.8.8:53 48.229.111.52.in-addr.arpa udp
N/A 127.0.0.1:6606 tcp
N/A 127.0.0.1:6606 tcp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:6606 tcp
N/A 127.0.0.1:7707 tcp
N/A 127.0.0.1:6606 tcp

Files

memory/988-0-0x000000007486E000-0x000000007486F000-memory.dmp

memory/988-1-0x0000000000A60000-0x0000000000A82000-memory.dmp

memory/988-2-0x0000000074860000-0x0000000075010000-memory.dmp

memory/988-3-0x0000000005430000-0x00000000054CC000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmpB6DC.tmp.bat

MD5 b625d5df6fd74d495433d7ca93364ddb
SHA1 c909de770b3494ad027c7bd766a296bc060fb4b7
SHA256 b64c76e182e1c41ca5d9a43b5498344cfe283d3b98694999e75476c5384011c4
SHA512 22d78cbaf5300393c86e6f112f98bcdf95b29e755f13b31faa10fcdc568a362af0e1442a228cc4a9002141474dacfb945918ea353eaf17e62c39f808a2cc3375

memory/988-9-0x0000000074860000-0x0000000075010000-memory.dmp

C:\Users\Admin\AppData\Roaming\executorroblox.exe

MD5 2dd4a3e79a430fcf80e0c16c059c4c2c
SHA1 b32b851bb2746acfa2035d6765f7827e5880debb
SHA256 5969e616a32e7cb09dd32ddca0c37e989a6131edb5c4a7b4367400c3f0e8527e
SHA512 cae7ef83d8eb0f77d018dae6327b46cbb61e68623d64551492f883b9903a00ff410a9bda7c84f4348497e55b34490b315f855b95288e71710076cb246863a6a4

memory/5000-13-0x00000000747E0000-0x0000000074F90000-memory.dmp

memory/5000-14-0x00000000747E0000-0x0000000074F90000-memory.dmp