Malware Analysis Report

2025-08-11 07:29

Sample ID 240802-3l481svfnr
Target c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5
SHA256 c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5
Tags
socks5systemz botnet discovery
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

c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5

Threat Level: Known bad

The file c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5 was found to be: Known bad.

Malicious Activity Summary

socks5systemz botnet discovery

Socks5Systemz

Detect Socks5Systemz Payload

Loads dropped DLL

Executes dropped EXE

Unexpected DNS network traffic destination

Checks installed software on the system

System Location Discovery: System Language Discovery

Unsigned PE

Suspicious behavior: EnumeratesProcesses

Suspicious use of FindShellTrayWindow

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-02 23:37

Signatures

Unsigned PE

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

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-02 23:37

Reported

2024-08-02 23:39

Platform

win11-20240802-en

Max time kernel

142s

Max time network

127s

Command Line

"C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe"

Signatures

Detect Socks5Systemz Payload

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

Socks5Systemz

botnet socks5systemz

Unexpected DNS network traffic destination

Description Indicator Process Target
Destination IP 91.211.247.248 N/A N/A

Checks installed software on the system

discovery

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\is-1UO6M.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\is-1UO6M.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2904 wrote to memory of 2964 N/A C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe C:\Users\Admin\AppData\Local\Temp\is-1UO6M.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp
PID 2904 wrote to memory of 2964 N/A C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe C:\Users\Admin\AppData\Local\Temp\is-1UO6M.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp
PID 2904 wrote to memory of 2964 N/A C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe C:\Users\Admin\AppData\Local\Temp\is-1UO6M.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp
PID 2964 wrote to memory of 4116 N/A C:\Users\Admin\AppData\Local\Temp\is-1UO6M.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe
PID 2964 wrote to memory of 4116 N/A C:\Users\Admin\AppData\Local\Temp\is-1UO6M.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe
PID 2964 wrote to memory of 4116 N/A C:\Users\Admin\AppData\Local\Temp\is-1UO6M.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe
PID 2964 wrote to memory of 1780 N/A C:\Users\Admin\AppData\Local\Temp\is-1UO6M.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe
PID 2964 wrote to memory of 1780 N/A C:\Users\Admin\AppData\Local\Temp\is-1UO6M.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe
PID 2964 wrote to memory of 1780 N/A C:\Users\Admin\AppData\Local\Temp\is-1UO6M.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe

Processes

C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe

"C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe"

C:\Users\Admin\AppData\Local\Temp\is-1UO6M.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp

"C:\Users\Admin\AppData\Local\Temp\is-1UO6M.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp" /SL5="$5030A,3984930,54272,C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe"

C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe

"C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe" -i

C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe

"C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe" -s

Network

Country Destination Domain Proto
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
LT 91.211.247.248:53 bwiaghz.com udp
CH 185.196.8.214:80 bwiaghz.com tcp

Files

memory/2904-0-0x0000000000400000-0x0000000000414000-memory.dmp

memory/2904-2-0x0000000000401000-0x000000000040B000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\is-1UO6M.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp

MD5 849bb5c3439284a175f581ec281ca92e
SHA1 8bd0737eac1a74de4d62d66911ca7ed9f61cbc0f
SHA256 33a8f60e50240aecdbedc45922032025376ecccc0c1acbd44c82f12985e82206
SHA512 ac7bd629b6ed2595c6af4ef0737d7d801c8c35ebb4638ec2c19569511157a1543a6fa91d1a15708810865ece1cfb27367480754a7debf716d322d1eb59c5f625

memory/2964-12-0x0000000000400000-0x00000000004BD000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\is-ELKHT.tmp\_isetup\_iscrypt.dll

MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe

MD5 8bcca4ad183014fe5a930cd349e523d2
SHA1 5ca455d7e225d8bdb05bdf389f270b3b221affab
SHA256 cd0f7ae7590fc5e32c02c178c91252e285d03b55374e5513c127cda5aeb45c1b
SHA512 2f580af96c856150845c3b64b26453ed9e556d8c92aef651c96cf1adadd4ad908a1cb500636c18a06bda3ae64cfaa50255e398e6a2250abe6a5feb26a128abcf

memory/4116-54-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/4116-52-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/4116-56-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1780-59-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/2904-60-0x0000000000400000-0x0000000000414000-memory.dmp

memory/2964-61-0x0000000000400000-0x00000000004BD000-memory.dmp

memory/1780-62-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1780-65-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1780-66-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1780-69-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1780-72-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1780-75-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1780-78-0x00000000026E0000-0x0000000002782000-memory.dmp

memory/1780-80-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1780-85-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1780-88-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1780-91-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1780-94-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1780-97-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1780-100-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1780-104-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1780-107-0x0000000000400000-0x00000000008B2000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-02 23:37

Reported

2024-08-02 23:39

Platform

win10v2004-20240802-en

Max time kernel

142s

Max time network

125s

Command Line

"C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe"

Signatures

Detect Socks5Systemz Payload

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

Socks5Systemz

botnet socks5systemz

Unexpected DNS network traffic destination

Description Indicator Process Target
Destination IP 141.98.234.31 N/A N/A

Checks installed software on the system

discovery

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\is-3VQ71.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\is-3VQ71.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3320 wrote to memory of 4956 N/A C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe C:\Users\Admin\AppData\Local\Temp\is-3VQ71.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp
PID 3320 wrote to memory of 4956 N/A C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe C:\Users\Admin\AppData\Local\Temp\is-3VQ71.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp
PID 3320 wrote to memory of 4956 N/A C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe C:\Users\Admin\AppData\Local\Temp\is-3VQ71.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp
PID 4956 wrote to memory of 4768 N/A C:\Users\Admin\AppData\Local\Temp\is-3VQ71.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe
PID 4956 wrote to memory of 4768 N/A C:\Users\Admin\AppData\Local\Temp\is-3VQ71.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe
PID 4956 wrote to memory of 4768 N/A C:\Users\Admin\AppData\Local\Temp\is-3VQ71.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe
PID 4956 wrote to memory of 1116 N/A C:\Users\Admin\AppData\Local\Temp\is-3VQ71.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe
PID 4956 wrote to memory of 1116 N/A C:\Users\Admin\AppData\Local\Temp\is-3VQ71.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe
PID 4956 wrote to memory of 1116 N/A C:\Users\Admin\AppData\Local\Temp\is-3VQ71.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe

Processes

C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe

"C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe"

C:\Users\Admin\AppData\Local\Temp\is-3VQ71.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp

"C:\Users\Admin\AppData\Local\Temp\is-3VQ71.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp" /SL5="$601D6,3984930,54272,C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe"

C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe

"C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe" -i

C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe

"C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe" -s

Network

Country Destination Domain Proto
US 8.8.8.8:53 2.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 0.205.248.87.in-addr.arpa udp
US 8.8.8.8:53 48.229.111.52.in-addr.arpa udp
HK 141.98.234.31:53 eblmyqt.ua udp
CH 185.196.8.214:80 eblmyqt.ua tcp
US 8.8.8.8:53 31.234.98.141.in-addr.arpa udp
US 8.8.8.8:53 214.8.196.185.in-addr.arpa udp

Files

memory/3320-0-0x0000000000400000-0x0000000000414000-memory.dmp

memory/3320-2-0x0000000000401000-0x000000000040B000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\is-3VQ71.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp

MD5 849bb5c3439284a175f581ec281ca92e
SHA1 8bd0737eac1a74de4d62d66911ca7ed9f61cbc0f
SHA256 33a8f60e50240aecdbedc45922032025376ecccc0c1acbd44c82f12985e82206
SHA512 ac7bd629b6ed2595c6af4ef0737d7d801c8c35ebb4638ec2c19569511157a1543a6fa91d1a15708810865ece1cfb27367480754a7debf716d322d1eb59c5f625

memory/4956-12-0x0000000000400000-0x00000000004BD000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\is-FMIA0.tmp\_isetup\_iscrypt.dll

MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe

MD5 8bcca4ad183014fe5a930cd349e523d2
SHA1 5ca455d7e225d8bdb05bdf389f270b3b221affab
SHA256 cd0f7ae7590fc5e32c02c178c91252e285d03b55374e5513c127cda5aeb45c1b
SHA512 2f580af96c856150845c3b64b26453ed9e556d8c92aef651c96cf1adadd4ad908a1cb500636c18a06bda3ae64cfaa50255e398e6a2250abe6a5feb26a128abcf

memory/4768-52-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/4768-53-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/4768-57-0x0000000000400000-0x000000000047F000-memory.dmp

memory/4768-56-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1116-60-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/3320-61-0x0000000000400000-0x0000000000414000-memory.dmp

memory/4956-62-0x0000000000400000-0x00000000004BD000-memory.dmp

memory/1116-63-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1116-66-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1116-69-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1116-72-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1116-75-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1116-78-0x0000000002AA0000-0x0000000002B42000-memory.dmp

memory/1116-80-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1116-85-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1116-88-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1116-91-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1116-94-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1116-97-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1116-100-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1116-104-0x0000000000400000-0x00000000008B2000-memory.dmp

memory/1116-107-0x0000000000400000-0x00000000008B2000-memory.dmp