Malware Analysis Report

2024-10-10 13:06

Sample ID 240620-1m3qgaycqe
Target atlx.zip
SHA256 c8ea017dcccf11517e1f3c2f010b01080e3f55455df7e63f2bba31ebe03d7a94
Tags
rat dcrat evasion infostealer
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

c8ea017dcccf11517e1f3c2f010b01080e3f55455df7e63f2bba31ebe03d7a94

Threat Level: Known bad

The file atlx.zip was found to be: Known bad.

Malicious Activity Summary

rat dcrat evasion infostealer

DcRat

DCRat payload

Dcrat family

DCRat payload

Disables Task Manager via registry modification

Loads dropped DLL

Checks computer location settings

Executes dropped EXE

Unsigned PE

Enumerates physical storage devices

Modifies registry class

Suspicious use of AdjustPrivilegeToken

Modifies registry key

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-06-20 21:46

Signatures

DCRat payload

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

Dcrat family

dcrat

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-20 21:46

Reported

2024-06-20 21:48

Platform

win7-20240419-en

Max time kernel

43s

Max time network

20s

Command Line

"C:\Users\Admin\AppData\Local\Temp\atlx\Avtronu.exe"

Signatures

DcRat

rat infostealer dcrat

DCRat payload

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

Disables Task Manager via registry modification

evasion

Executes dropped EXE

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

Loads dropped DLL

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

Enumerates physical storage devices

Modifies registry key

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

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\PortcrtNet\Crtdll.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2164 wrote to memory of 3044 N/A C:\Users\Admin\AppData\Local\Temp\atlx\Avtronu.exe C:\Windows\SysWOW64\WScript.exe
PID 2164 wrote to memory of 3044 N/A C:\Users\Admin\AppData\Local\Temp\atlx\Avtronu.exe C:\Windows\SysWOW64\WScript.exe
PID 2164 wrote to memory of 3044 N/A C:\Users\Admin\AppData\Local\Temp\atlx\Avtronu.exe C:\Windows\SysWOW64\WScript.exe
PID 2164 wrote to memory of 3044 N/A C:\Users\Admin\AppData\Local\Temp\atlx\Avtronu.exe C:\Windows\SysWOW64\WScript.exe
PID 3044 wrote to memory of 2752 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 3044 wrote to memory of 2752 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 3044 wrote to memory of 2752 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 3044 wrote to memory of 2752 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2752 wrote to memory of 2692 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\PortcrtNet\Crtdll.exe
PID 2752 wrote to memory of 2692 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\PortcrtNet\Crtdll.exe
PID 2752 wrote to memory of 2692 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\PortcrtNet\Crtdll.exe
PID 2752 wrote to memory of 2692 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\PortcrtNet\Crtdll.exe
PID 2752 wrote to memory of 2652 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\reg.exe
PID 2752 wrote to memory of 2652 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\reg.exe
PID 2752 wrote to memory of 2652 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\reg.exe
PID 2752 wrote to memory of 2652 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\reg.exe

Processes

C:\Users\Admin\AppData\Local\Temp\atlx\Avtronu.exe

"C:\Users\Admin\AppData\Local\Temp\atlx\Avtronu.exe"

C:\Windows\SysWOW64\WScript.exe

"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\PortcrtNet\qxDH4No15f3EsjB09ngd.vbe"

C:\Windows\SysWOW64\cmd.exe

cmd /c ""C:\Users\Admin\AppData\Roaming\PortcrtNet\0zsSFhiVuyt57TfUIw.bat" "

C:\Users\Admin\AppData\Roaming\PortcrtNet\Crtdll.exe

"C:\Users\Admin\AppData\Roaming\PortcrtNet\Crtdll.exe"

C:\Windows\SysWOW64\reg.exe

reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f

C:\Windows\explorer.exe

"C:\Windows\explorer.exe"

Network

N/A

Files

C:\Users\Admin\AppData\Roaming\PortcrtNet\qxDH4No15f3EsjB09ngd.vbe

MD5 92dd38b0aa7eb75f379921f0ce168d84
SHA1 244553e896f3cf11b2afd05875b7b568ea670c1e
SHA256 9c88e1d45269af8c0e1dc3ed3c6314a74c539071534627413100b86e6b46780e
SHA512 5451dc7cf1d2ee45624aed72c62669b539c41e17c21a34205c8ef9bf629d38753fa2e1299e8b4c76da2bf4a47430b358a2a69e7aa04faa5a369883c5bdbb9b72

C:\Users\Admin\AppData\Roaming\PortcrtNet\0zsSFhiVuyt57TfUIw.bat

MD5 3e5d70a529a6b9f3b21d4bb37da2f3a8
SHA1 8f5a085af2469fec75a8cc6477cb9dbbeb499362
SHA256 7ffb1337193c9f62799624f1662714eff09af1713febf3f4fdd573c4ed1f8098
SHA512 6b100689cf9114cb071a791c488a84446f89eceea9faaf1e0a14fa7692310ca89c5662a30e3b80535217e21c6edd282a4ea4f4a2e8a19689c3968830ff669671

\Users\Admin\AppData\Roaming\PortcrtNet\Crtdll.exe

MD5 84bd967d8484329937559675eae06444
SHA1 0d631cdd75d15000278dcf2edcd5befd20d114f2
SHA256 22c28d34d8b911554af1f1c0b8801f4212012f732ce306be489ebc439e490607
SHA512 6a3746ed177ae55162d3706fb105c3da8712d34253524d62135fb7dc2dd8f29599190d31cb0ca0b1221ddeeb21ca6cf8b5d4ee9b5e34a6d26d0ccb2629ea962d

memory/2692-13-0x0000000000DA0000-0x00000000010BE000-memory.dmp

memory/2692-14-0x00000000003D0000-0x00000000003DE000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-20 21:46

Reported

2024-06-20 21:47

Platform

win10v2004-20240611-en

Max time kernel

45s

Max time network

51s

Command Line

"C:\Users\Admin\AppData\Local\Temp\atlx\Avtronu.exe"

Signatures

DcRat

rat infostealer dcrat

DCRat payload

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

Disables Task Manager via registry modification

evasion

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-200405930-3877336739-3533750831-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\atlx\Avtronu.exe N/A
Key value queried \REGISTRY\USER\S-1-5-21-200405930-3877336739-3533750831-1000\Control Panel\International\Geo\Nation C:\Windows\SysWOW64\WScript.exe N/A

Executes dropped EXE

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

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-200405930-3877336739-3533750831-1000_Classes\Local Settings C:\Users\Admin\AppData\Local\Temp\atlx\Avtronu.exe N/A

Modifies registry key

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

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\PortcrtNet\Crtdll.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\atlx\Avtronu.exe

"C:\Users\Admin\AppData\Local\Temp\atlx\Avtronu.exe"

C:\Windows\SysWOW64\WScript.exe

"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\PortcrtNet\qxDH4No15f3EsjB09ngd.vbe"

C:\Windows\SysWOW64\cmd.exe

C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\PortcrtNet\0zsSFhiVuyt57TfUIw.bat" "

C:\Users\Admin\AppData\Roaming\PortcrtNet\Crtdll.exe

"C:\Users\Admin\AppData\Roaming\PortcrtNet\Crtdll.exe"

C:\Windows\SysWOW64\reg.exe

reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f

Network

Country Destination Domain Proto
US 8.8.8.8:53 28.118.140.52.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
NL 23.62.61.97:443 www.bing.com tcp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 97.61.62.23.in-addr.arpa udp
US 8.8.8.8:53 10.28.171.150.in-addr.arpa udp
US 8.8.8.8:53 67.31.126.40.in-addr.arpa udp
US 20.42.73.26:443 tcp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 92.12.20.2.in-addr.arpa udp
NL 23.62.61.194:443 www.bing.com tcp
US 8.8.8.8:53 194.61.62.23.in-addr.arpa udp
US 8.8.8.8:53 203.197.79.204.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Roaming\PortcrtNet\qxDH4No15f3EsjB09ngd.vbe

MD5 92dd38b0aa7eb75f379921f0ce168d84
SHA1 244553e896f3cf11b2afd05875b7b568ea670c1e
SHA256 9c88e1d45269af8c0e1dc3ed3c6314a74c539071534627413100b86e6b46780e
SHA512 5451dc7cf1d2ee45624aed72c62669b539c41e17c21a34205c8ef9bf629d38753fa2e1299e8b4c76da2bf4a47430b358a2a69e7aa04faa5a369883c5bdbb9b72

C:\Users\Admin\AppData\Roaming\PortcrtNet\0zsSFhiVuyt57TfUIw.bat

MD5 3e5d70a529a6b9f3b21d4bb37da2f3a8
SHA1 8f5a085af2469fec75a8cc6477cb9dbbeb499362
SHA256 7ffb1337193c9f62799624f1662714eff09af1713febf3f4fdd573c4ed1f8098
SHA512 6b100689cf9114cb071a791c488a84446f89eceea9faaf1e0a14fa7692310ca89c5662a30e3b80535217e21c6edd282a4ea4f4a2e8a19689c3968830ff669671

C:\Users\Admin\AppData\Roaming\PortcrtNet\Crtdll.exe

MD5 84bd967d8484329937559675eae06444
SHA1 0d631cdd75d15000278dcf2edcd5befd20d114f2
SHA256 22c28d34d8b911554af1f1c0b8801f4212012f732ce306be489ebc439e490607
SHA512 6a3746ed177ae55162d3706fb105c3da8712d34253524d62135fb7dc2dd8f29599190d31cb0ca0b1221ddeeb21ca6cf8b5d4ee9b5e34a6d26d0ccb2629ea962d

memory/2680-12-0x00007FFE589B3000-0x00007FFE589B5000-memory.dmp

memory/2680-13-0x00000000002D0000-0x00000000005EE000-memory.dmp

memory/2680-14-0x000000001B0E0000-0x000000001B0EE000-memory.dmp