Malware Analysis Report

2024-12-07 22:20

Sample ID 240809-k5b3gasgjg
Target z1SWIFT_YOR406100432.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: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

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 Overview

score
10/10

SHA256

2bda6048a888003443cd18df65f75441974ea3dfa04d524c957b0d7c268654dc

Threat Level: Known bad

The file z1SWIFT_YOR406100432.exe was found to be: Known bad.

Malicious Activity Summary

remcos remotehost discovery rat

Remcos

Loads dropped DLL

Suspicious use of NtSetInformationThreadHideFromDebugger

Suspicious use of NtCreateThreadExHideFromDebugger

Suspicious use of SetThreadContext

Drops file in Program Files directory

Enumerates physical storage devices

System Location Discovery: System Language Discovery

Unsigned PE

Program crash

Suspicious behavior: MapViewOfSection

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-09 09:10

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-09 09:10

Reported

2024-08-09 09:14

Platform

win7-20240704-en

Max time kernel

150s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe"

Signatures

Remcos

rat remcos

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe N/A

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe N/A

Suspicious use of NtSetInformationThreadHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1924 set thread context of 1608 N/A C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe C:\Users\Admin\AppData\Local\Temp\z1SWIFT_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\z1SWIFT_YOR406100432.exe N/A
File opened for modification C:\Program Files (x86)\vocabulary.Med C:\Users\Admin\AppData\Local\Temp\z1SWIFT_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\z1SWIFT_YOR406100432.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe

"C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe"

C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe

"C:\Users\Admin\AppData\Local\Temp\z1SWIFT_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 a7c3f3129ec197e99b1c10227819dfa1
SHA1 69dc370024543d1a0a226a0432588d122c140c86
SHA256 00e11ac975ff84f6ae020cb287bdd1fa7536f851b1dcd4f2cb5c6ccabab5dac3
SHA512 899eb32178652e8d795c7a5768f556facdcacb727a896b287fbe07f899ec8bc378d4e6201e2e56725ab6261e137dc70498fba47b9c64b130f7f1d6a29e7e9d52

\Users\Admin\AppData\Local\Temp\nsoEE75.tmp\System.dll

MD5 0d7ad4f45dc6f5aa87f606d0331c6901
SHA1 48df0911f0484cbe2a8cdd5362140b63c41ee457
SHA256 3eb38ae99653a7dbc724132ee240f6e5c4af4bfe7c01d31d23faf373f9f2eaca
SHA512 c07de7308cb54205e8bd703001a7fe4fd7796c9ac1b4bb330c77c872bf712b093645f40b80ce7127531fe6746a5b66e18ea073ab6a644934abed9bb64126fea9

memory/1924-675-0x0000000076DE1000-0x0000000076EE2000-memory.dmp

memory/1924-676-0x0000000076DE0000-0x0000000076F89000-memory.dmp

memory/1608-677-0x0000000076DE0000-0x0000000076F89000-memory.dmp

memory/1608-678-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1608-679-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1608-684-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1608-685-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1608-686-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1608-687-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1608-688-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1608-689-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1608-690-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1608-691-0x00000000004A0000-0x0000000001502000-memory.dmp

memory/1608-692-0x00000000004A0000-0x0000000001502000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-09 09:10

Reported

2024-08-09 09:14

Platform

win10v2004-20240802-en

Max time kernel

147s

Max time network

148s

Command Line

"C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe"

Signatures

Remcos

rat remcos

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe N/A

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe N/A

Suspicious use of NtSetInformationThreadHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 4500 set thread context of 4616 N/A C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe C:\Users\Admin\AppData\Local\Temp\z1SWIFT_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\z1SWIFT_YOR406100432.exe N/A
File opened for modification C:\Program Files (x86)\vocabulary.Med C:\Users\Admin\AppData\Local\Temp\z1SWIFT_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\z1SWIFT_YOR406100432.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe

"C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe"

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe

"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4440,i,1729213506309163284,12809566808978835441,262144 --variations-seed-version --mojo-platform-channel-handle=3668 /prefetch:8

C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe

"C:\Users\Admin\AppData\Local\Temp\z1SWIFT_YOR406100432.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 g.bing.com udp
US 13.107.21.237:443 g.bing.com tcp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 18.53.126.40.in-addr.arpa udp
US 8.8.8.8:53 237.21.107.13.in-addr.arpa udp
NL 91.92.242.99:80 91.92.242.99 tcp
US 8.8.8.8:53 99.242.92.91.in-addr.arpa udp
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 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 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 99.58.20.217.in-addr.arpa udp
US 8.8.8.8:53 31.243.111.52.in-addr.arpa udp
US 8.8.8.8:53 73.144.22.2.in-addr.arpa udp

Files

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

MD5 46b12fbc0e0d6a7d4dedfe7dbe195cc9
SHA1 5090d8a844c5ce26e5d3c41fa24a075ef15defbb
SHA256 0168416d1c055325d44c980371a764b52d2ebd02f54279107ed28bfcadcb4428
SHA512 87ba3e61425396dc8ca3847072f097ec33735472fa0bc28355dbd9e93eb86fef251007fdc53e8c414229d94752fa158022accc5b6d85dc6bb8c0935f3e68225f

C:\Users\Admin\AppData\Local\Temp\nsrAE2E.tmp\System.dll

MD5 0d7ad4f45dc6f5aa87f606d0331c6901
SHA1 48df0911f0484cbe2a8cdd5362140b63c41ee457
SHA256 3eb38ae99653a7dbc724132ee240f6e5c4af4bfe7c01d31d23faf373f9f2eaca
SHA512 c07de7308cb54205e8bd703001a7fe4fd7796c9ac1b4bb330c77c872bf712b093645f40b80ce7127531fe6746a5b66e18ea073ab6a644934abed9bb64126fea9

memory/4500-674-0x0000000077B61000-0x0000000077C81000-memory.dmp

memory/4500-675-0x00000000747B5000-0x00000000747B6000-memory.dmp

memory/4616-676-0x0000000077BE8000-0x0000000077BE9000-memory.dmp

memory/4616-677-0x0000000077C05000-0x0000000077C06000-memory.dmp

memory/4616-678-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/4616-683-0x0000000077B61000-0x0000000077C81000-memory.dmp

memory/4616-682-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/4616-685-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/4616-686-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/4616-687-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/4616-690-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/4616-691-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/4616-692-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/4616-693-0x00000000004A0000-0x00000000016F4000-memory.dmp

memory/4616-694-0x00000000004A0000-0x00000000016F4000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2024-08-09 09:10

Reported

2024-08-09 09:15

Platform

win7-20240704-en

Max time kernel

122s

Max time network

128s

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 1932 -s 224

Network

N/A

Files

N/A

Analysis: behavioral4

Detonation Overview

Submitted

2024-08-09 09:10

Reported

2024-08-09 09:15

Platform

win10v2004-20240802-en

Max time kernel

148s

Max time network

156s

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 1332 wrote to memory of 1184 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1332 wrote to memory of 1184 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1332 wrote to memory of 1184 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 1184 -ip 1184

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1184 -s 612

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 73.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 73.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 81.144.22.2.in-addr.arpa udp

Files

N/A