remcos | 090113047c8231e14489ee51f2b8b2aeb5db34c96eb32dcb0b9552fefd2d110c

Analysis

max time kernel
150s
max time network
145s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
27-08-2024 14:53

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General

Target

PI-100957Review invoice.rtf
Size

713KB
MD5

75ea30d53407de50f374dcb996d16382
SHA1

de90b4973ff236b3de7f214e3bce17d6d94f937f
SHA256

20f69dbe505beadbb6aa03610ebf58a7b0d6d00adae76225cb381ba4fbaa520f
SHA512

c1778b658736066a370067ea669e1f0e1aa67362d24fa7779c9fdc91b2a12c96f452e39ba374e89799c6138c8e7bf349a8aeecfdb691265a123f84bd0cbbfe2c
SSDEEP

6144:FwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwA9:z

Score

10^/10

remcos bcv collection credential_access discovery execution rat spyware stealer

Malware Config

Extracted

Family

remcos

Botnet

BCV

tvq3101.sytes.net:1974

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
Remcos
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-9PFUGS
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
take_screenshot_option
false
take_screenshot_time
5

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003

Detected Nirsoft tools 3 IoCs

Free utilities often used by attackers which can steal passwords, product keys, etc.

resource	yara_rule
behavioral1/memory/472-77-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral1/memory/1696-76-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral1/memory/2068-71-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

NirSoft MailPassView 1 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/472-77-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 1 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral1/memory/2068-71-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Blocklisted process makes network request 1 IoCs

flow	pid	Process
4	3056	EQNEDT32.EXE

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
2520	powershell.exe

Downloads MZ/PE file

Executes dropped EXE 5 IoCs

pid	Process
2344	bcvplug09185.exe
2548	bcvplug09185.exe
2068	bcvplug09185.exe
472	bcvplug09185.exe
1696	bcvplug09185.exe

Loads dropped DLL 1 IoCs

pid	Process
3056	EQNEDT32.EXE

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2257386474-3982792636-3902186748-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	bcvplug09185.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\%ProgramData%\Microsoft\Windows\Start Menu\Programs\Accessories\Windows PowerShell\Windows PowerShell.lnk	powershell.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 2344 set thread context of 2548	2344	bcvplug09185.exe	37
PID 2548 set thread context of 2068	2548	bcvplug09185.exe	41
PID 2548 set thread context of 472	2548	bcvplug09185.exe	42
PID 2548 set thread context of 1696	2548	bcvplug09185.exe	43

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\Debug\WIA\wiatrace.log	WINWORD.EXE

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 8 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bcvplug09185.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	EQNEDT32.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bcvplug09185.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bcvplug09185.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bcvplug09185.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bcvplug09185.exe

Office loads VBA resources, possible macro or embedded object present

Launches Equation Editor 1 TTPs 1 IoCs

Equation Editor is an old Office component often targeted by exploits such as CVE-2017-11882.

exploit

Exploitation for Client Execution

T1203

pid	Process
3056	EQNEDT32.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2284	WINWORD.EXE

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2520	powershell.exe
2068	bcvplug09185.exe
2068	bcvplug09185.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2548	bcvplug09185.exe

Suspicious behavior: MapViewOfSection 3 IoCs

pid	Process
2548	bcvplug09185.exe
2548	bcvplug09185.exe
2548	bcvplug09185.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2520	powershell.exe
Token: SeDebugPrivilege	1696	bcvplug09185.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2548	bcvplug09185.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2548	bcvplug09185.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
2284	WINWORD.EXE
2284	WINWORD.EXE
2548	bcvplug09185.exe

Suspicious use of WriteProcessMemory 40 IoCs

description	pid	Process	procid_target
PID 3056 wrote to memory of 2344	3056	EQNEDT32.EXE	32
PID 3056 wrote to memory of 2344	3056	EQNEDT32.EXE	32
PID 3056 wrote to memory of 2344	3056	EQNEDT32.EXE	32
PID 3056 wrote to memory of 2344	3056	EQNEDT32.EXE	32
PID 2284 wrote to memory of 1596	2284	WINWORD.EXE	34
PID 2284 wrote to memory of 1596	2284	WINWORD.EXE	34
PID 2284 wrote to memory of 1596	2284	WINWORD.EXE	34
PID 2284 wrote to memory of 1596	2284	WINWORD.EXE	34
PID 2344 wrote to memory of 2520	2344	bcvplug09185.exe	35
PID 2344 wrote to memory of 2520	2344	bcvplug09185.exe	35
PID 2344 wrote to memory of 2520	2344	bcvplug09185.exe	35
PID 2344 wrote to memory of 2520	2344	bcvplug09185.exe	35
PID 2344 wrote to memory of 2548	2344	bcvplug09185.exe	37
PID 2344 wrote to memory of 2548	2344	bcvplug09185.exe	37
PID 2344 wrote to memory of 2548	2344	bcvplug09185.exe	37
PID 2344 wrote to memory of 2548	2344	bcvplug09185.exe	37
PID 2344 wrote to memory of 2548	2344	bcvplug09185.exe	37
PID 2344 wrote to memory of 2548	2344	bcvplug09185.exe	37
PID 2344 wrote to memory of 2548	2344	bcvplug09185.exe	37
PID 2344 wrote to memory of 2548	2344	bcvplug09185.exe	37
PID 2344 wrote to memory of 2548	2344	bcvplug09185.exe	37
PID 2344 wrote to memory of 2548	2344	bcvplug09185.exe	37
PID 2344 wrote to memory of 2548	2344	bcvplug09185.exe	37
PID 2344 wrote to memory of 2548	2344	bcvplug09185.exe	37
PID 2344 wrote to memory of 2548	2344	bcvplug09185.exe	37
PID 2548 wrote to memory of 2068	2548	bcvplug09185.exe	41
PID 2548 wrote to memory of 2068	2548	bcvplug09185.exe	41
PID 2548 wrote to memory of 2068	2548	bcvplug09185.exe	41
PID 2548 wrote to memory of 2068	2548	bcvplug09185.exe	41
PID 2548 wrote to memory of 2068	2548	bcvplug09185.exe	41
PID 2548 wrote to memory of 472	2548	bcvplug09185.exe	42
PID 2548 wrote to memory of 472	2548	bcvplug09185.exe	42
PID 2548 wrote to memory of 472	2548	bcvplug09185.exe	42
PID 2548 wrote to memory of 472	2548	bcvplug09185.exe	42
PID 2548 wrote to memory of 472	2548	bcvplug09185.exe	42
PID 2548 wrote to memory of 1696	2548	bcvplug09185.exe	43
PID 2548 wrote to memory of 1696	2548	bcvplug09185.exe	43
PID 2548 wrote to memory of 1696	2548	bcvplug09185.exe	43
PID 2548 wrote to memory of 1696	2548	bcvplug09185.exe	43
PID 2548 wrote to memory of 1696	2548	bcvplug09185.exe	43

C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE
"C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\PI-100957Review invoice.rtf"
1⤵
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2284
- C:\Windows\splwow64.exe
  C:\Windows\splwow64.exe 12288
  2⤵
  PID:1596

C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE
"C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE" -Embedding
1⤵
- Blocklisted process makes network request
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Launches Equation Editor
- Suspicious use of WriteProcessMemory
PID:3056
- C:\Users\Admin\AppData\Roaming\bcvplug09185.exe
  "C:\Users\Admin\AppData\Roaming\bcvplug09185.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2344
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\bcvplug09185.exe"
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Drops file in System32 directory
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2520
- - C:\Users\Admin\AppData\Roaming\bcvplug09185.exe
    "C:\Users\Admin\AppData\Roaming\bcvplug09185.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of FindShellTrayWindow
    - Suspicious use of SendNotifyMessage
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2548
  - - C:\Users\Admin\AppData\Roaming\bcvplug09185.exe
      C:\Users\Admin\AppData\Roaming\bcvplug09185.exe /stext "C:\Users\Admin\AppData\Local\Temp\xdnvotfqhcgfhtcukusffdelytyutbn"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      PID:2068
  - - C:\Users\Admin\AppData\Roaming\bcvplug09185.exe
      C:\Users\Admin\AppData\Roaming\bcvplug09185.exe /stext "C:\Users\Admin\AppData\Local\Temp\hftoodprvkykkayytfnhqizchzqvmmetny"
      4⤵
      Executes dropped EXE
      Accesses Microsoft Outlook accounts
      System Location Discovery: System Language Discovery
      PID:472
  - - C:\Users\Admin\AppData\Roaming\bcvplug09185.exe
      C:\Users\Admin\AppData\Roaming\bcvplug09185.exe /stext "C:\Users\Admin\AppData\Local\Temp\jzgzpw"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      PID:1696

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Exploitation for Client Execution

T1203

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\remcos\logs.dat

Filesize
208B

MD5
8f3fc6d8039aa2e70a81f3a2c278c0e1

SHA1
4695679ba1621db2a5f69c35161c1dea87cf228f

SHA256
dabde84deebc9a530d73f1034f162fe3a082ebacba5d114f87a0ead97c86980e

SHA512
97535f92ae0e06ed28e20ae9f31c6ba7229ecd64933645e9b2a12893265efb61be09ffb301a8ad01cce6a13e85f00d4ccb232f381273b7070fec9bb3d62f6d03

Download Submit
C:\Users\Admin\AppData\Local\Temp\xdnvotfqhcgfhtcukusffdelytyutbn

Filesize
2B

MD5
f3b25701fe362ec84616a93a45ce9998

SHA1
d62636d8caec13f04e28442a0a6fa1afeb024bbb

SHA256
b3d510ef04275ca8e698e5b3cbb0ece3949ef9252f0cdc839e9ee347409a2209

SHA512
98c5f56f3de340690c139e58eb7dac111979f0d4dffe9c4b24ff849510f4b6ffa9fd608c0a3de9ac3c9fd2190f0efaf715309061490f9755a9bfdf1c54ca0d84

Download Submit
\Users\Admin\AppData\Roaming\bcvplug09185.exe

Filesize
927KB

MD5
339dcd1a52b9095623e72c678f20ed01

SHA1
a2bd542dcddefc2ece12e47b380bc343ead31604

SHA256
1414f1e42aa7b329d33ddbf9c64024eb822b1f61780bede84aa260724bd36b60

SHA512
06b4ab19a5cd8957d879ed141e9d9ad5a0c4898d2bb460f4796d2d04014a67a10fe00bc6243a8936c8ec1b9be7d6cf4ce1a8a6c278067e6ea86ed5a2d40150a7

Download Submit
memory/472-77-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/472-68-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/472-70-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/1696-75-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/1696-73-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/1696-76-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/1696-72-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2068-66-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2068-64-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2068-71-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2284-0-0x000000002FF31000-0x000000002FF32000-memory.dmp

Filesize
4KB

Download
memory/2284-2-0x00000000717FD000-0x0000000071808000-memory.dmp

Filesize
44KB

Download
memory/2284-16-0x00000000717FD000-0x0000000071808000-memory.dmp

Filesize
44KB

Download
memory/2284-1-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/2344-18-0x0000000005AB0000-0x0000000005B70000-memory.dmp

Filesize
768KB

Download
memory/2344-14-0x0000000000A20000-0x0000000000B0A000-memory.dmp

Filesize
936KB

Download
memory/2344-15-0x0000000000660000-0x0000000000678000-memory.dmp

Filesize
96KB

Download
memory/2548-39-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-36-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-23-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-47-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-48-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-50-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-49-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-52-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-56-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-57-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-27-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-29-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-31-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-33-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-35-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2548-25-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-38-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-40-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-43-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-44-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-21-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-19-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-84-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-85-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-89-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/2548-86-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/2548-90-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/2548-91-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-98-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-99-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-106-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2548-107-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download