Malware Analysis Report

2024-12-07 22:17

Sample ID 240809-bg2tjstfjl
Target 2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe
SHA256 2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc
Tags
remcos remotehost discovery rat
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: behavioral3

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral4

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc

Threat Level: Known bad

The file 2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe was found to be: Known bad.

Malicious Activity Summary

remcos remotehost discovery rat

Remcos

Loads dropped DLL

Suspicious use of NtCreateThreadExHideFromDebugger

Suspicious use of NtSetInformationThreadHideFromDebugger

Suspicious use of SetThreadContext

Drops file in Program Files directory

Enumerates physical storage devices

System Location Discovery: System Language Discovery

Program crash

Unsigned PE

Suspicious behavior: MapViewOfSection

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-09 01:07

Signatures

Unsigned PE

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

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-09 01:07

Reported

2024-08-09 01:10

Platform

win10v2004-20240802-en

Max time kernel

149s

Max time network

149s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe"

Signatures

Remcos

rat remcos

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe N/A

Drops file in Program Files directory

Description Indicator Process Target
File opened for modification C:\Program Files (x86)\niveaukurven.ini C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe N/A
File opened for modification C:\Program Files (x86)\vocabulary.Med C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.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:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe

"C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe"

C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe

"C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.237:443 g.bing.com tcp
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 20.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 25.140.123.92.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
NL 91.92.242.99:80 91.92.242.99 tcp
NL 45.66.231.198:2404 tcp
US 8.8.8.8:53 198.231.66.45.in-addr.arpa udp
US 8.8.8.8:53 99.242.92.91.in-addr.arpa udp
US 8.8.8.8:53 geoplugin.net udp
NL 178.237.33.50:80 geoplugin.net tcp
US 8.8.8.8:53 50.33.237.178.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\rijksdaalder.lnk

MD5 11dfb912ca362087f6e82650a03676e4
SHA1 986e49d3fac26807b3750b0776be30c5e23a6d63
SHA256 623ba3bf245871fb4ff9dc046d2bdd481e47c8326ca865cfe386202f1778b0ae
SHA512 252f20152ce9b2570f1e9094655ac870215d0feaa3c5c5dadc6239be7c1ce3ea912763ad0ec2791aabe3d457159531f8d388aeeaf6042671c438d7be00f8bbb5

C:\Users\Admin\AppData\Local\Temp\nsb954C.tmp\System.dll

MD5 0d7ad4f45dc6f5aa87f606d0331c6901
SHA1 48df0911f0484cbe2a8cdd5362140b63c41ee457
SHA256 3eb38ae99653a7dbc724132ee240f6e5c4af4bfe7c01d31d23faf373f9f2eaca
SHA512 c07de7308cb54205e8bd703001a7fe4fd7796c9ac1b4bb330c77c872bf712b093645f40b80ce7127531fe6746a5b66e18ea073ab6a644934abed9bb64126fea9

memory/2712-674-0x0000000077471000-0x0000000077591000-memory.dmp

memory/2712-675-0x00000000740C5000-0x00000000740C6000-memory.dmp

memory/3344-676-0x00000000774F8000-0x00000000774F9000-memory.dmp

memory/3344-677-0x0000000077515000-0x0000000077516000-memory.dmp

memory/3344-678-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/3344-682-0x0000000077471000-0x0000000077591000-memory.dmp

memory/3344-684-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/3344-685-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/3344-686-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/3344-687-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/3344-688-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/3344-689-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/3344-690-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/3344-691-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/3344-692-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/3344-694-0x00000000004A0000-0x00000000016F4000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2024-08-09 01:07

Reported

2024-08-09 01:10

Platform

win7-20240704-en

Max time kernel

117s

Max time network

118s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.dll,#1

Signatures

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Windows\SysWOW64\rundll32.exe

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\rundll32.exe N/A

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1736 -s 220

Network

N/A

Files

N/A

Analysis: behavioral4

Detonation Overview

Submitted

2024-08-09 01:07

Reported

2024-08-09 01:10

Platform

win10v2004-20240802-en

Max time kernel

92s

Max time network

94s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.dll,#1

Signatures

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Windows\SysWOW64\rundll32.exe

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2452 wrote to memory of 1468 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2452 wrote to memory of 1468 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2452 wrote to memory of 1468 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 368 -p 1468 -ip 1468

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1468 -s 612

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 4.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 2.36.159.162.in-addr.arpa udp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 71.190.18.2.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp

Files

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-09 01:07

Reported

2024-08-09 01:10

Platform

win7-20240704-en

Max time kernel

148s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe"

Signatures

Remcos

rat remcos

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe N/A

Drops file in Program Files directory

Description Indicator Process Target
File opened for modification C:\Program Files (x86)\niveaukurven.ini C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe N/A
File opened for modification C:\Program Files (x86)\vocabulary.Med C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.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:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2540 wrote to memory of 1532 N/A C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe
PID 2540 wrote to memory of 1532 N/A C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe
PID 2540 wrote to memory of 1532 N/A C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe
PID 2540 wrote to memory of 1532 N/A C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe
PID 2540 wrote to memory of 1532 N/A C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe
PID 2540 wrote to memory of 1532 N/A C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe

Processes

C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe

"C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe"

C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe

"C:\Users\Admin\AppData\Local\Temp\2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc.exe"

Network

Country Destination Domain Proto
NL 91.92.242.99:80 91.92.242.99 tcp
NL 45.66.231.198:2404 tcp
US 8.8.8.8:53 geoplugin.net udp
NL 178.237.33.50:80 geoplugin.net tcp

Files

C:\Users\Admin\AppData\Local\rijksdaalder.lnk

MD5 a7c3f3129ec197e99b1c10227819dfa1
SHA1 69dc370024543d1a0a226a0432588d122c140c86
SHA256 00e11ac975ff84f6ae020cb287bdd1fa7536f851b1dcd4f2cb5c6ccabab5dac3
SHA512 899eb32178652e8d795c7a5768f556facdcacb727a896b287fbe07f899ec8bc378d4e6201e2e56725ab6261e137dc70498fba47b9c64b130f7f1d6a29e7e9d52

\Users\Admin\AppData\Local\Temp\nsd9BA4.tmp\System.dll

MD5 0d7ad4f45dc6f5aa87f606d0331c6901
SHA1 48df0911f0484cbe2a8cdd5362140b63c41ee457
SHA256 3eb38ae99653a7dbc724132ee240f6e5c4af4bfe7c01d31d23faf373f9f2eaca
SHA512 c07de7308cb54205e8bd703001a7fe4fd7796c9ac1b4bb330c77c872bf712b093645f40b80ce7127531fe6746a5b66e18ea073ab6a644934abed9bb64126fea9

memory/2540-676-0x0000000077C30000-0x0000000077DD9000-memory.dmp

memory/2540-675-0x0000000077C31000-0x0000000077D32000-memory.dmp

memory/1532-677-0x0000000077C30000-0x0000000077DD9000-memory.dmp

memory/1532-678-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1532-679-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1532-684-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1532-685-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1532-686-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1532-687-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1532-688-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1532-689-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1532-690-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1532-691-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1532-692-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1532-693-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1532-694-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1532-695-0x00000000004A0000-0x0000000001502000-memory.dmp