Malware Analysis Report

2025-08-06 02:53

Sample ID 240215-jgye5abh9x
Target RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe
SHA256 c5bbe31a17d4365500acaf7bd2fbfc10f8a0867d650e12b24e22efa239cfdb3d
Tags
remcos 3904 persistence rat
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

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: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

c5bbe31a17d4365500acaf7bd2fbfc10f8a0867d650e12b24e22efa239cfdb3d

Threat Level: Known bad

The file RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe was found to be: Known bad.

Malicious Activity Summary

remcos 3904 persistence rat

Remcos

Executes dropped EXE

Checks computer location settings

Loads dropped DLL

Adds Run key to start application

Suspicious use of SetThreadContext

Suspicious use of NtCreateThreadExHideFromDebugger

Suspicious use of NtSetInformationThreadHideFromDebugger

Program crash

Unsigned PE

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

Suspicious behavior: MapViewOfSection

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-02-15 07:39

Signatures

Unsigned PE

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

Analysis: behavioral3

Detonation Overview

Submitted

2024-02-15 07:39

Reported

2024-02-15 07:41

Platform

win7-20231215-en

Max time kernel

120s

Max time network

126s

Command Line

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

Signatures

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 2884 -s 224

Network

N/A

Files

N/A

Analysis: behavioral4

Detonation Overview

Submitted

2024-02-15 07:39

Reported

2024-02-15 07:41

Platform

win10v2004-20231215-en

Max time kernel

143s

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 876 wrote to memory of 1044 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 876 wrote to memory of 1044 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 876 wrote to memory of 1044 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 188 -p 1044 -ip 1044

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1044 -s 612

Network

Country Destination Domain Proto
NL 52.142.223.178:80 tcp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 0.205.248.87.in-addr.arpa udp
US 8.8.8.8:53 140.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 149.220.183.52.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 18.134.221.88.in-addr.arpa udp
US 8.8.8.8:53 173.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 18.173.189.20.in-addr.arpa udp

Files

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-02-15 07:39

Reported

2024-02-15 07:41

Platform

win7-20231215-en

Max time kernel

119s

Max time network

123s

Command Line

"C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe"

Signatures

Processes

C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe

"C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe"

Network

N/A

Files

\Users\Admin\AppData\Local\Temp\nso3CD4.tmp\System.dll

MD5 4add245d4ba34b04f213409bfe504c07
SHA1 ef756d6581d70e87d58cc4982e3f4d18e0ea5b09
SHA256 9111099efe9d5c9b391dc132b2faf0a3851a760d4106d5368e30ac744eb42706
SHA512 1bd260cabe5ea3cefbbc675162f30092ab157893510f45a1b571489e03ebb2903c55f64f89812754d3fe03c8f10012b8078d1261a7e73ac1f87c82f714bce03d

Analysis: behavioral2

Detonation Overview

Submitted

2024-02-15 07:39

Reported

2024-02-15 07:41

Platform

win10v2004-20231215-en

Max time kernel

152s

Max time network

155s

Command Line

"C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe"

Signatures

Remcos

rat remcos

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-3073191680-435865314-2862784915-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\ProgramData\vsystems\vsystems.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-3073191680-435865314-2862784915-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Kulstoffets = "C:\\Users\\Admin\\AppData\\Roaming\\Filformaters\\Disponere189.exe" C:\ProgramData\vsystems\vsystems.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-3073191680-435865314-2862784915-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Kulstoffets = "C:\\Users\\Admin\\AppData\\Roaming\\Filformaters\\Disponere189.exe" C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-3073191680-435865314-2862784915-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Rmc-BSR5QU = "\"C:\\ProgramData\\vsystems\\vsystems.exe\"" C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Rmc-BSR5QU = "\"C:\\ProgramData\\vsystems\\vsystems.exe\"" C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe N/A

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe N/A

Enumerates physical storage devices

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe N/A
N/A N/A C:\ProgramData\vsystems\vsystems.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4204 wrote to memory of 2384 N/A C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe
PID 4204 wrote to memory of 2384 N/A C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe
PID 4204 wrote to memory of 2384 N/A C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe
PID 4204 wrote to memory of 2384 N/A C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe
PID 4204 wrote to memory of 2384 N/A C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe
PID 2384 wrote to memory of 3996 N/A C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe C:\ProgramData\vsystems\vsystems.exe
PID 2384 wrote to memory of 3996 N/A C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe C:\ProgramData\vsystems\vsystems.exe
PID 2384 wrote to memory of 3996 N/A C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe C:\ProgramData\vsystems\vsystems.exe
PID 3996 wrote to memory of 2588 N/A C:\ProgramData\vsystems\vsystems.exe C:\ProgramData\vsystems\vsystems.exe
PID 3996 wrote to memory of 2588 N/A C:\ProgramData\vsystems\vsystems.exe C:\ProgramData\vsystems\vsystems.exe
PID 3996 wrote to memory of 2588 N/A C:\ProgramData\vsystems\vsystems.exe C:\ProgramData\vsystems\vsystems.exe
PID 3996 wrote to memory of 2588 N/A C:\ProgramData\vsystems\vsystems.exe C:\ProgramData\vsystems\vsystems.exe
PID 3996 wrote to memory of 2588 N/A C:\ProgramData\vsystems\vsystems.exe C:\ProgramData\vsystems\vsystems.exe

Processes

C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe

"C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe"

C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe

"C:\Users\Admin\AppData\Local\Temp\RFQ#RE_Q1_2100006461_SUPPLY_ABB_MATTERIALS_Waagner_Biro_Bridge_pdf.exe"

C:\ProgramData\vsystems\vsystems.exe

"C:\ProgramData\vsystems\vsystems.exe"

C:\ProgramData\vsystems\vsystems.exe

"C:\ProgramData\vsystems\vsystems.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 149.220.183.52.in-addr.arpa udp
US 8.8.8.8:53 180.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 209.178.17.96.in-addr.arpa udp
US 96.47.233.26:80 96.47.233.26 tcp
US 8.8.8.8:53 26.233.47.96.in-addr.arpa udp
US 8.8.8.8:53 43.229.111.52.in-addr.arpa udp
US 8.8.8.8:53 6.173.189.20.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\nsq637.tmp\System.dll

MD5 4add245d4ba34b04f213409bfe504c07
SHA1 ef756d6581d70e87d58cc4982e3f4d18e0ea5b09
SHA256 9111099efe9d5c9b391dc132b2faf0a3851a760d4106d5368e30ac744eb42706
SHA512 1bd260cabe5ea3cefbbc675162f30092ab157893510f45a1b571489e03ebb2903c55f64f89812754d3fe03c8f10012b8078d1261a7e73ac1f87c82f714bce03d

memory/4204-14-0x0000000077351000-0x0000000077471000-memory.dmp

memory/4204-15-0x0000000074040000-0x0000000074047000-memory.dmp

memory/2384-16-0x00000000773D8000-0x00000000773D9000-memory.dmp

memory/2384-17-0x0000000077351000-0x0000000077471000-memory.dmp

memory/2384-19-0x0000000000490000-0x00000000016E4000-memory.dmp

memory/2384-20-0x0000000000490000-0x00000000016E4000-memory.dmp

memory/2384-24-0x0000000077351000-0x0000000077471000-memory.dmp

C:\ProgramData\vsystems\vsystems.exe

MD5 1e58da14d2ed23644fdb298a7d34d12d
SHA1 f9f9c1d3223ba88db9b21c59ea5445ba64996ab5
SHA256 4f6ae439cf324689d2838b7cac7e0514e1ada2e5978f97989c13a0023a277dd7
SHA512 4871d9480dcfe25d09e63831f5141583d0479217a39bd518119977f36d6fd35dc5d25691f0abfefba722808ece43892f10ed0669c821cf1ac72e4de05062c976

C:\ProgramData\vsystems\vsystems.exe

MD5 2d445bd0fd5ca61eb05f2a293e7e9ecb
SHA1 4728f6650d9658ad6c9db2a1c01c88b0bd9be712
SHA256 c5bbe31a17d4365500acaf7bd2fbfc10f8a0867d650e12b24e22efa239cfdb3d
SHA512 a8939d865005272c265e8c235153bffad905d6cb28aabd9599e707d2e09f55e3fc876d85a68da75947df4af5dde7b2d81916bf5d53e3319194fe2eb16414fd30

memory/2384-35-0x0000000000490000-0x00000000016E4000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\coralla\samisens\Restage\Frknerne\Brugerlicensaftalerne\Handlefrihedernes\Grdefrdig.Spi

MD5 86f5b6261e755ad3f7c05b02e562a4cf
SHA1 89dc4b4ef749b2d71d63f9385b3b0ef5fac03499
SHA256 da8723c0c747b978c81ebe5d318a5a298bf85813392758323ab45999cd4db0a9
SHA512 a180dcb9c1b8acd35534ba7fc40953396bc686109b423901c4530783e4a03b63879f5f690aafe0ac5d1645e7c0f78885e794cd292185ac1d055d4a73eacb5c92

memory/3996-45-0x0000000077351000-0x0000000077471000-memory.dmp

memory/3996-46-0x00000000750F0000-0x00000000750F7000-memory.dmp

C:\Users\Admin\AppData\Roaming\Filformaters\Disponere189.exe

MD5 52b28d1b15025f4ea0534f7ae9d0f9c3
SHA1 1e276114271cf908edd35547863f31e4460252a9
SHA256 7af2cf2df4b43316571f30f7e6ce7e66742d6d43a568ac64a153c7499c9c34f3
SHA512 37bb99f27c33794f57d4449fcaf2fe6607cf1dfde8d32058c655af20fdac14502da9c8d130d750788c78a4ca40e9ba166f66d1606c5504082260a675f6d14be4

memory/2588-50-0x0000000000490000-0x00000000016E4000-memory.dmp