Malware Analysis Report

2024-12-07 22:21

Sample ID 240807-rcpw7azblk
Target 07082024_1403_07082024_SWIFT_YOR406100432.gz
SHA256 07e5c45941435c5eb12765ad184ee2312abe4b6338e6564781f9b2d309930982
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

07e5c45941435c5eb12765ad184ee2312abe4b6338e6564781f9b2d309930982

Threat Level: Known bad

The file 07082024_1403_07082024_SWIFT_YOR406100432.gz was found to be: Known bad.

Malicious Activity Summary

remcos remotehost discovery rat

Remcos

Loads dropped DLL

Suspicious use of SetThreadContext

Suspicious use of NtCreateThreadExHideFromDebugger

Suspicious use of NtSetInformationThreadHideFromDebugger

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

2024-08-07 14:03

Signatures

Unsigned PE

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

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-07 14:03

Reported

2024-08-07 14:05

Platform

win10v2004-20240802-en

Max time kernel

149s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe"

Signatures

Remcos

rat remcos

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe N/A

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe N/A

Suspicious use of NtSetInformationThreadHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 452 set thread context of 3800 N/A C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe

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\SWIFT_YOR406100432.exe N/A
File opened for modification C:\Program Files (x86)\vocabulary.Med C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.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\SWIFT_YOR406100432.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe

"C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe"

C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe

"C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 79.190.18.2.in-addr.arpa udp
US 8.8.8.8:53 55.36.223.20.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 99.242.92.91.in-addr.arpa udp
US 8.8.8.8:53 198.231.66.45.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 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 40.58.20.217.in-addr.arpa udp
US 8.8.8.8:53 21.236.111.52.in-addr.arpa udp

Files

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

MD5 0447ecf518731377c6c93849fc1c9fca
SHA1 211f007f65d12a0315b1931d4b9f879b95aaad6f
SHA256 ec162a101a3150046f3ac5a839b72dbf07a663db81d855945357efff5eadfd3f
SHA512 1490a8dd01ab9a1c842908211c54d05fa13ef40d638005e56cf402eda4f79e1c78bc4343b8887d27ffd6060d552c2a937f3640fb4b81dab6c8d261ca1083a83d

C:\Users\Admin\AppData\Local\Temp\nsmA3C3.tmp\System.dll

MD5 0d7ad4f45dc6f5aa87f606d0331c6901
SHA1 48df0911f0484cbe2a8cdd5362140b63c41ee457
SHA256 3eb38ae99653a7dbc724132ee240f6e5c4af4bfe7c01d31d23faf373f9f2eaca
SHA512 c07de7308cb54205e8bd703001a7fe4fd7796c9ac1b4bb330c77c872bf712b093645f40b80ce7127531fe6746a5b66e18ea073ab6a644934abed9bb64126fea9

memory/452-674-0x0000000077031000-0x0000000077151000-memory.dmp

memory/452-675-0x0000000073C85000-0x0000000073C86000-memory.dmp

memory/3800-676-0x00000000770B8000-0x00000000770B9000-memory.dmp

memory/3800-677-0x00000000770D5000-0x00000000770D6000-memory.dmp

memory/3800-678-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/3800-682-0x0000000077031000-0x0000000077151000-memory.dmp

memory/3800-684-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/3800-685-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/3800-686-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/3800-689-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/3800-690-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/3800-691-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/3800-695-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/3800-696-0x00000000004A0000-0x00000000016F4000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2024-08-07 14:03

Reported

2024-08-07 14:05

Platform

win7-20240708-en

Max time kernel

121s

Max time network

122s

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 1624 -s 220

Network

N/A

Files

N/A

Analysis: behavioral4

Detonation Overview

Submitted

2024-08-07 14:03

Reported

2024-08-07 14:05

Platform

win10v2004-20240802-en

Max time kernel

0s

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 932 wrote to memory of 4232 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 932 wrote to memory of 4232 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 932 wrote to memory of 4232 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 360 -p 4232 -ip 4232

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4232 -s 612

Network

N/A

Files

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-07 14:03

Reported

2024-08-07 14:05

Platform

win7-20240704-en

Max time kernel

147s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe"

Signatures

Remcos

rat remcos

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe N/A

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe N/A

Suspicious use of NtSetInformationThreadHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1996 set thread context of 2248 N/A C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe

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\SWIFT_YOR406100432.exe N/A
File opened for modification C:\Program Files (x86)\vocabulary.Med C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.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\SWIFT_YOR406100432.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe

"C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe"

C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.exe

"C:\Users\Admin\AppData\Local\Temp\SWIFT_YOR406100432.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 3231629bdc0b04d79a8e62691f86bbcf
SHA1 af0feec75451df00252bd2969c7fdf8a891ebf91
SHA256 d2669fa56e04e2cc4243b00aa2523183e601cf8a3a5ddc5a413ef5b46c5a9679
SHA512 c95e1c384e058e38ed86f802afcf0c0a880dda2316550ab8646a5f79bf3cd4a5a3ce8f4d4a04ed48954d8347709d9b8fd955fcfad0cf831387e2ee13cdbe2c0b

\Users\Admin\AppData\Local\Temp\nsp204E.tmp\System.dll

MD5 0d7ad4f45dc6f5aa87f606d0331c6901
SHA1 48df0911f0484cbe2a8cdd5362140b63c41ee457
SHA256 3eb38ae99653a7dbc724132ee240f6e5c4af4bfe7c01d31d23faf373f9f2eaca
SHA512 c07de7308cb54205e8bd703001a7fe4fd7796c9ac1b4bb330c77c872bf712b093645f40b80ce7127531fe6746a5b66e18ea073ab6a644934abed9bb64126fea9

memory/1996-675-0x0000000077771000-0x0000000077872000-memory.dmp

memory/1996-676-0x0000000077770000-0x0000000077919000-memory.dmp

memory/2248-677-0x0000000077770000-0x0000000077919000-memory.dmp

memory/2248-679-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/2248-683-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/2248-684-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/2248-685-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/2248-686-0x00000000004A0000-0x0000000001502000-memory.dmp