Malware Analysis Report

2024-10-24 17:03

Sample ID 220820-zees1aahg8
Target server.exe
SHA256 3cda160efdccaa80d566e2161b0e0d1541a9cb8d282d7636093e6e249235c1b3
Tags
runningrat persistence rat
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

3cda160efdccaa80d566e2161b0e0d1541a9cb8d282d7636093e6e249235c1b3

Threat Level: Known bad

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

Malicious Activity Summary

runningrat persistence rat

RunningRat payload

Runningrat family

RunningRat

Executes dropped EXE

Sets DLL path for service in the registry

Loads dropped DLL

Drops file in System32 directory

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2022-08-20 20:37

Signatures

RunningRat payload

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

Runningrat family

runningrat

Analysis: behavioral1

Detonation Overview

Submitted

2022-08-20 20:37

Reported

2022-08-20 20:40

Platform

win7-20220812-en

Max time kernel

150s

Max time network

45s

Command Line

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

Signatures

RunningRat

rat runningrat

RunningRat payload

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

Executes dropped EXE

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

Sets DLL path for service in the registry

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SYSTEM\ControlSet001\services\NETSRDSLS\Parameters\ServiceDll = "C:\\Users\\Admin\\AppData\\Local\\Temp\\7076158.dll" C:\Users\Admin\AppData\Local\Temp\server.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File opened for modification C:\Windows\SysWOW64\ini.ini C:\Users\Admin\AppData\Local\Temp\server.exe N/A
File created C:\Windows\SysWOW64\NETSRDSLS.exe C:\Windows\SysWOW64\svchost.exe N/A
File opened for modification C:\Windows\SysWOW64\NETSRDSLS.exe C:\Windows\SysWOW64\svchost.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1524 wrote to memory of 864 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\NETSRDSLS.exe
PID 1524 wrote to memory of 864 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\NETSRDSLS.exe
PID 1524 wrote to memory of 864 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\NETSRDSLS.exe
PID 1524 wrote to memory of 864 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\NETSRDSLS.exe

Processes

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

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

C:\Windows\SysWOW64\svchost.exe

C:\Windows\SysWOW64\svchost.exe -k "NETSRDSLS"

C:\Windows\SysWOW64\svchost.exe

C:\Windows\SysWOW64\svchost.exe -k "NETSRDSLS"

C:\Windows\SysWOW64\NETSRDSLS.exe

C:\Windows\system32\NETSRDSLS.exe "c:\users\admin\appdata\local\temp\7076158.dll",MainThread

Network

Country Destination Domain Proto
SG 43.128.99.124:520 tcp
SG 43.128.99.124:520 tcp

Files

memory/1908-54-0x0000000010000000-0x000000001000F000-memory.dmp

memory/1908-58-0x00000000762F1000-0x00000000762F3000-memory.dmp

\Users\Admin\AppData\Local\Temp\7076158.dll

MD5 dc1e8352301906fff28e0b5333370920
SHA1 115aa527bc1e9cbd6787b2635975bb645033a9f8
SHA256 278e1137e3880bc5404ac5fa7f0b8670b231d128f872d612865546b110c47e15
SHA512 86135b36789452b647e2f1657d3f73da708a71e368be6579110df6c54a248e855f2616763a48186024ab028bae3f2e28b8edb8c64634db92a91a220e81a93d13

memory/1908-60-0x00000000001F0000-0x00000000001FD000-memory.dmp

\Users\Admin\AppData\Local\Temp\7076158.dll

MD5 dc1e8352301906fff28e0b5333370920
SHA1 115aa527bc1e9cbd6787b2635975bb645033a9f8
SHA256 278e1137e3880bc5404ac5fa7f0b8670b231d128f872d612865546b110c47e15
SHA512 86135b36789452b647e2f1657d3f73da708a71e368be6579110df6c54a248e855f2616763a48186024ab028bae3f2e28b8edb8c64634db92a91a220e81a93d13

\??\c:\users\admin\appdata\local\temp\7076158.dll

MD5 dc1e8352301906fff28e0b5333370920
SHA1 115aa527bc1e9cbd6787b2635975bb645033a9f8
SHA256 278e1137e3880bc5404ac5fa7f0b8670b231d128f872d612865546b110c47e15
SHA512 86135b36789452b647e2f1657d3f73da708a71e368be6579110df6c54a248e855f2616763a48186024ab028bae3f2e28b8edb8c64634db92a91a220e81a93d13

\Windows\SysWOW64\NETSRDSLS.exe

MD5 51138beea3e2c21ec44d0932c71762a8
SHA1 8939cf35447b22dd2c6e6f443446acc1bf986d58
SHA256 5ad3c37e6f2b9db3ee8b5aeedc474645de90c66e3d95f8620c48102f1eba4124
SHA512 794f30fe452117ff2a26dc9d7086aaf82b639c2632ac2e381a81f5239caaec7c96922ba5d2d90bfd8d74f0a6cd4f79fbda63e14c6b779e5cf6834c13e4e45e7d

C:\Windows\SysWOW64\NETSRDSLS.exe

MD5 51138beea3e2c21ec44d0932c71762a8
SHA1 8939cf35447b22dd2c6e6f443446acc1bf986d58
SHA256 5ad3c37e6f2b9db3ee8b5aeedc474645de90c66e3d95f8620c48102f1eba4124
SHA512 794f30fe452117ff2a26dc9d7086aaf82b639c2632ac2e381a81f5239caaec7c96922ba5d2d90bfd8d74f0a6cd4f79fbda63e14c6b779e5cf6834c13e4e45e7d

memory/864-65-0x0000000000000000-mapping.dmp

\Users\Admin\AppData\Local\Temp\7076158.dll

MD5 dc1e8352301906fff28e0b5333370920
SHA1 115aa527bc1e9cbd6787b2635975bb645033a9f8
SHA256 278e1137e3880bc5404ac5fa7f0b8670b231d128f872d612865546b110c47e15
SHA512 86135b36789452b647e2f1657d3f73da708a71e368be6579110df6c54a248e855f2616763a48186024ab028bae3f2e28b8edb8c64634db92a91a220e81a93d13

\Users\Admin\AppData\Local\Temp\7076158.dll

MD5 dc1e8352301906fff28e0b5333370920
SHA1 115aa527bc1e9cbd6787b2635975bb645033a9f8
SHA256 278e1137e3880bc5404ac5fa7f0b8670b231d128f872d612865546b110c47e15
SHA512 86135b36789452b647e2f1657d3f73da708a71e368be6579110df6c54a248e855f2616763a48186024ab028bae3f2e28b8edb8c64634db92a91a220e81a93d13

\Users\Admin\AppData\Local\Temp\7076158.dll

MD5 dc1e8352301906fff28e0b5333370920
SHA1 115aa527bc1e9cbd6787b2635975bb645033a9f8
SHA256 278e1137e3880bc5404ac5fa7f0b8670b231d128f872d612865546b110c47e15
SHA512 86135b36789452b647e2f1657d3f73da708a71e368be6579110df6c54a248e855f2616763a48186024ab028bae3f2e28b8edb8c64634db92a91a220e81a93d13

C:\Windows\SysWOW64\NETSRDSLS.exe

MD5 51138beea3e2c21ec44d0932c71762a8
SHA1 8939cf35447b22dd2c6e6f443446acc1bf986d58
SHA256 5ad3c37e6f2b9db3ee8b5aeedc474645de90c66e3d95f8620c48102f1eba4124
SHA512 794f30fe452117ff2a26dc9d7086aaf82b639c2632ac2e381a81f5239caaec7c96922ba5d2d90bfd8d74f0a6cd4f79fbda63e14c6b779e5cf6834c13e4e45e7d

\Users\Admin\AppData\Local\Temp\7076158.dll

MD5 dc1e8352301906fff28e0b5333370920
SHA1 115aa527bc1e9cbd6787b2635975bb645033a9f8
SHA256 278e1137e3880bc5404ac5fa7f0b8670b231d128f872d612865546b110c47e15
SHA512 86135b36789452b647e2f1657d3f73da708a71e368be6579110df6c54a248e855f2616763a48186024ab028bae3f2e28b8edb8c64634db92a91a220e81a93d13

Analysis: behavioral2

Detonation Overview

Submitted

2022-08-20 20:37

Reported

2022-08-20 20:40

Platform

win10v2004-20220812-en

Max time kernel

151s

Max time network

153s

Command Line

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

Signatures

RunningRat

rat runningrat

RunningRat payload

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

Executes dropped EXE

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

Sets DLL path for service in the registry

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\NETSRDSLS\Parameters\ServiceDll = "C:\\Users\\Admin\\AppData\\Local\\Temp\\240545031.dll" C:\Users\Admin\AppData\Local\Temp\server.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File opened for modification C:\Windows\SysWOW64\ini.ini C:\Users\Admin\AppData\Local\Temp\server.exe N/A
File created C:\Windows\SysWOW64\NETSRDSLS.exe C:\Windows\SysWOW64\svchost.exe N/A
File opened for modification C:\Windows\SysWOW64\NETSRDSLS.exe C:\Windows\SysWOW64\svchost.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4932 wrote to memory of 2040 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\NETSRDSLS.exe
PID 4932 wrote to memory of 2040 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\NETSRDSLS.exe
PID 4932 wrote to memory of 2040 N/A C:\Windows\SysWOW64\svchost.exe C:\Windows\SysWOW64\NETSRDSLS.exe

Processes

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

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

C:\Windows\SysWOW64\svchost.exe

C:\Windows\SysWOW64\svchost.exe -k "NETSRDSLS"

C:\Windows\SysWOW64\svchost.exe

C:\Windows\SysWOW64\svchost.exe -k "NETSRDSLS"

C:\Windows\SysWOW64\NETSRDSLS.exe

C:\Windows\system32\NETSRDSLS.exe "c:\users\admin\appdata\local\temp\240545031.dll",MainThread

Network

Country Destination Domain Proto
US 93.184.220.29:80 tcp
US 93.184.220.29:80 tcp
SG 43.128.99.124:520 tcp
US 8.253.225.254:80 tcp
US 8.253.225.254:80 tcp
US 209.197.3.8:80 tcp
US 209.197.3.8:80 tcp
US 93.184.220.29:80 tcp
SG 43.128.99.124:520 tcp

Files

memory/836-132-0x0000000010000000-0x000000001000F000-memory.dmp

memory/836-138-0x0000000000510000-0x000000000051D000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\240545031.dll

MD5 dc1e8352301906fff28e0b5333370920
SHA1 115aa527bc1e9cbd6787b2635975bb645033a9f8
SHA256 278e1137e3880bc5404ac5fa7f0b8670b231d128f872d612865546b110c47e15
SHA512 86135b36789452b647e2f1657d3f73da708a71e368be6579110df6c54a248e855f2616763a48186024ab028bae3f2e28b8edb8c64634db92a91a220e81a93d13

C:\Users\Admin\AppData\Local\Temp\240545031.dll

MD5 dc1e8352301906fff28e0b5333370920
SHA1 115aa527bc1e9cbd6787b2635975bb645033a9f8
SHA256 278e1137e3880bc5404ac5fa7f0b8670b231d128f872d612865546b110c47e15
SHA512 86135b36789452b647e2f1657d3f73da708a71e368be6579110df6c54a248e855f2616763a48186024ab028bae3f2e28b8edb8c64634db92a91a220e81a93d13

C:\Users\Admin\AppData\Local\Temp\240545031.dll

MD5 dc1e8352301906fff28e0b5333370920
SHA1 115aa527bc1e9cbd6787b2635975bb645033a9f8
SHA256 278e1137e3880bc5404ac5fa7f0b8670b231d128f872d612865546b110c47e15
SHA512 86135b36789452b647e2f1657d3f73da708a71e368be6579110df6c54a248e855f2616763a48186024ab028bae3f2e28b8edb8c64634db92a91a220e81a93d13

\??\c:\users\admin\appdata\local\temp\240545031.dll

MD5 dc1e8352301906fff28e0b5333370920
SHA1 115aa527bc1e9cbd6787b2635975bb645033a9f8
SHA256 278e1137e3880bc5404ac5fa7f0b8670b231d128f872d612865546b110c47e15
SHA512 86135b36789452b647e2f1657d3f73da708a71e368be6579110df6c54a248e855f2616763a48186024ab028bae3f2e28b8edb8c64634db92a91a220e81a93d13

memory/2040-141-0x0000000000000000-mapping.dmp

C:\Windows\SysWOW64\NETSRDSLS.exe

MD5 889b99c52a60dd49227c5e485a016679
SHA1 8fa889e456aa646a4d0a4349977430ce5fa5e2d7
SHA256 6cbe0e1f046b13b29bfa26f8b368281d2dda7eb9b718651d5856f22cc3e02910
SHA512 08933106eaf338dd119c45cbf1f83e723aff77cc0f8d3fc84e36253b1eb31557a54211d1d5d1cb58958188e32064d451f6c66a24b3963cccd3de07299ab90641

C:\Users\Admin\AppData\Local\Temp\240545031.dll

MD5 dc1e8352301906fff28e0b5333370920
SHA1 115aa527bc1e9cbd6787b2635975bb645033a9f8
SHA256 278e1137e3880bc5404ac5fa7f0b8670b231d128f872d612865546b110c47e15
SHA512 86135b36789452b647e2f1657d3f73da708a71e368be6579110df6c54a248e855f2616763a48186024ab028bae3f2e28b8edb8c64634db92a91a220e81a93d13

C:\Windows\SysWOW64\NETSRDSLS.exe

MD5 889b99c52a60dd49227c5e485a016679
SHA1 8fa889e456aa646a4d0a4349977430ce5fa5e2d7
SHA256 6cbe0e1f046b13b29bfa26f8b368281d2dda7eb9b718651d5856f22cc3e02910
SHA512 08933106eaf338dd119c45cbf1f83e723aff77cc0f8d3fc84e36253b1eb31557a54211d1d5d1cb58958188e32064d451f6c66a24b3963cccd3de07299ab90641