Analysis
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max time kernel
142s -
max time network
125s -
platform
windows10-2004_x64 -
resource
win10v2004-20240802-en -
resource tags
arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system -
submitted
02/08/2024, 23:37
Static task
static1
Behavioral task
behavioral1
Sample
c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe
Resource
win10v2004-20240802-en
Behavioral task
behavioral2
Sample
c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe
Resource
win11-20240802-en
General
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Target
c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe
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Size
4.1MB
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MD5
c1eb7dd6cf79b4abdaf4dbc4884feabb
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SHA1
ff9aa2c84c1940d4d1fa7d540b6b7e2f678e4caa
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SHA256
c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5
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SHA512
e3361143a7cb84e46eaea75feef4144a35405df98b9114e17fb589b1513fc2cc267d7049ee61719e5bc78f1689a6dbd588bcf4bfd16ee429a3df4a907a1993db
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SSDEEP
98304:Nof/+vuGSH8tO7SZ7g2yLt72d3AK8YJJ1zjrM8P885qodK:Gn6Sr7Sd2h72d7vXMc888o4
Malware Config
Signatures
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Detect Socks5Systemz Payload 1 IoCs
resource yara_rule behavioral1/memory/1116-78-0x0000000002AA0000-0x0000000002B42000-memory.dmp family_socks5systemz -
Socks5Systemz
Socks5Systemz is a botnet written in C++.
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Executes dropped EXE 3 IoCs
pid Process 4956 c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp 4768 ac3filter32_64.exe 1116 ac3filter32_64.exe -
Loads dropped DLL 1 IoCs
pid Process 4956 c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp -
Unexpected DNS network traffic destination 1 IoCs
Network traffic to other servers than the configured DNS servers was detected on the DNS port.
description ioc Destination IP 141.98.234.31 -
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
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System Location Discovery: System Language Discovery 1 TTPs 4 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language ac3filter32_64.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language ac3filter32_64.exe -
Suspicious behavior: EnumeratesProcesses 2 IoCs
pid Process 4956 c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp 4956 c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp -
Suspicious use of FindShellTrayWindow 1 IoCs
pid Process 4956 c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp -
Suspicious use of WriteProcessMemory 9 IoCs
description pid Process procid_target PID 3320 wrote to memory of 4956 3320 c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe 83 PID 3320 wrote to memory of 4956 3320 c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe 83 PID 3320 wrote to memory of 4956 3320 c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe 83 PID 4956 wrote to memory of 4768 4956 c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp 85 PID 4956 wrote to memory of 4768 4956 c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp 85 PID 4956 wrote to memory of 4768 4956 c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp 85 PID 4956 wrote to memory of 1116 4956 c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp 86 PID 4956 wrote to memory of 1116 4956 c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp 86 PID 4956 wrote to memory of 1116 4956 c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp 86
Processes
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C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe"C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe"1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3320 -
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"2⤵
- Executes dropped EXE
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
PID:4956 -
C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe"C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe" -i3⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
PID:4768
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C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe"C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe" -s3⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
PID:1116
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
4.7MB
MD58bcca4ad183014fe5a930cd349e523d2
SHA15ca455d7e225d8bdb05bdf389f270b3b221affab
SHA256cd0f7ae7590fc5e32c02c178c91252e285d03b55374e5513c127cda5aeb45c1b
SHA5122f580af96c856150845c3b64b26453ed9e556d8c92aef651c96cf1adadd4ad908a1cb500636c18a06bda3ae64cfaa50255e398e6a2250abe6a5feb26a128abcf
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C:\Users\Admin\AppData\Local\Temp\is-3VQ71.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp
Filesize692KB
MD5849bb5c3439284a175f581ec281ca92e
SHA18bd0737eac1a74de4d62d66911ca7ed9f61cbc0f
SHA25633a8f60e50240aecdbedc45922032025376ecccc0c1acbd44c82f12985e82206
SHA512ac7bd629b6ed2595c6af4ef0737d7d801c8c35ebb4638ec2c19569511157a1543a6fa91d1a15708810865ece1cfb27367480754a7debf716d322d1eb59c5f625
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Filesize
2KB
MD5a69559718ab506675e907fe49deb71e9
SHA1bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA2562f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
SHA512e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63