remcos | 6c98f35634c02c4cc1d7cbc628ba843c85e80559c1b1d51d44efb3e3bbfc40f6

Analysis

max time kernel
150s
max time network
148s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
28-08-2024 01:49

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General

Target

6c98f35634c02c4cc1d7cbc628ba843c85e80559c1b1d51d44efb3e3bbfc40f6.rtf
Size

766KB
MD5

c0d48716ea8eef0d46d77cc231fa5371
SHA1

1438d2234f6a36f27aa9b0c2465e71fd607a26c3
SHA256

6c98f35634c02c4cc1d7cbc628ba843c85e80559c1b1d51d44efb3e3bbfc40f6
SHA512

3fecda49692f47df4b3971d505b4a0920c6cff73433656e25144e87755b48f68d5b56aa087a1df204b46c1e8b312d580aef453cb3815377030e788047299e73b
SSDEEP

6144:pwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwA1:5o6

Score

10^/10

remcos aug 26 collection credential_access discovery execution rat spyware stealer

Malware Config

Extracted

Family

remcos

Botnet

AUG 26

sungito2.ddns.net:6509

154.216.19.222:5532

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-LXAZN2
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/2356-66-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral1/memory/2416-72-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral1/memory/2348-70-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

NirSoft MailPassView 1 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/2356-66-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 1 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral1/memory/2348-70-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Blocklisted process makes network request 1 IoCs

flow	pid	Process
3	2724	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
2208	powershell.exe

Downloads MZ/PE file

Executes dropped EXE 5 IoCs

pid	Process
2628	sinbless09185.exe
1756	sinbless09185.exe
2348	sinbless09185.exe
2356	sinbless09185.exe
2416	sinbless09185.exe

Loads dropped DLL 1 IoCs

pid	Process
2724	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-1-5-21-2703099537-420551529-3771253338-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	sinbless09185.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 2628 set thread context of 1756	2628	sinbless09185.exe	36
PID 1756 set thread context of 2348	1756	sinbless09185.exe	39
PID 1756 set thread context of 2356	1756	sinbless09185.exe	40
PID 1756 set thread context of 2416	1756	sinbless09185.exe	41

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	sinbless09185.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	sinbless09185.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sinbless09185.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sinbless09185.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sinbless09185.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
2724	EQNEDT32.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2704	WINWORD.EXE

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2208	powershell.exe
2348	sinbless09185.exe
2348	sinbless09185.exe

Suspicious behavior: MapViewOfSection 3 IoCs

pid	Process
1756	sinbless09185.exe
1756	sinbless09185.exe
1756	sinbless09185.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2208	powershell.exe
Token: SeDebugPrivilege	2416	sinbless09185.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
2704	WINWORD.EXE
2704	WINWORD.EXE
1756	sinbless09185.exe

Suspicious use of WriteProcessMemory 40 IoCs

description	pid	Process	procid_target
PID 2724 wrote to memory of 2628	2724	EQNEDT32.EXE	32
PID 2724 wrote to memory of 2628	2724	EQNEDT32.EXE	32
PID 2724 wrote to memory of 2628	2724	EQNEDT32.EXE	32
PID 2724 wrote to memory of 2628	2724	EQNEDT32.EXE	32
PID 2704 wrote to memory of 2264	2704	WINWORD.EXE	34
PID 2704 wrote to memory of 2264	2704	WINWORD.EXE	34
PID 2704 wrote to memory of 2264	2704	WINWORD.EXE	34
PID 2704 wrote to memory of 2264	2704	WINWORD.EXE	34
PID 2628 wrote to memory of 2208	2628	sinbless09185.exe	35
PID 2628 wrote to memory of 2208	2628	sinbless09185.exe	35
PID 2628 wrote to memory of 2208	2628	sinbless09185.exe	35
PID 2628 wrote to memory of 2208	2628	sinbless09185.exe	35
PID 2628 wrote to memory of 1756	2628	sinbless09185.exe	36
PID 2628 wrote to memory of 1756	2628	sinbless09185.exe	36
PID 2628 wrote to memory of 1756	2628	sinbless09185.exe	36
PID 2628 wrote to memory of 1756	2628	sinbless09185.exe	36
PID 2628 wrote to memory of 1756	2628	sinbless09185.exe	36
PID 2628 wrote to memory of 1756	2628	sinbless09185.exe	36
PID 2628 wrote to memory of 1756	2628	sinbless09185.exe	36
PID 2628 wrote to memory of 1756	2628	sinbless09185.exe	36
PID 2628 wrote to memory of 1756	2628	sinbless09185.exe	36
PID 2628 wrote to memory of 1756	2628	sinbless09185.exe	36
PID 2628 wrote to memory of 1756	2628	sinbless09185.exe	36
PID 2628 wrote to memory of 1756	2628	sinbless09185.exe	36
PID 2628 wrote to memory of 1756	2628	sinbless09185.exe	36
PID 1756 wrote to memory of 2348	1756	sinbless09185.exe	39
PID 1756 wrote to memory of 2348	1756	sinbless09185.exe	39
PID 1756 wrote to memory of 2348	1756	sinbless09185.exe	39
PID 1756 wrote to memory of 2348	1756	sinbless09185.exe	39
PID 1756 wrote to memory of 2348	1756	sinbless09185.exe	39
PID 1756 wrote to memory of 2356	1756	sinbless09185.exe	40
PID 1756 wrote to memory of 2356	1756	sinbless09185.exe	40
PID 1756 wrote to memory of 2356	1756	sinbless09185.exe	40
PID 1756 wrote to memory of 2356	1756	sinbless09185.exe	40
PID 1756 wrote to memory of 2356	1756	sinbless09185.exe	40
PID 1756 wrote to memory of 2416	1756	sinbless09185.exe	41
PID 1756 wrote to memory of 2416	1756	sinbless09185.exe	41
PID 1756 wrote to memory of 2416	1756	sinbless09185.exe	41
PID 1756 wrote to memory of 2416	1756	sinbless09185.exe	41
PID 1756 wrote to memory of 2416	1756	sinbless09185.exe	41

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\6c98f35634c02c4cc1d7cbc628ba843c85e80559c1b1d51d44efb3e3bbfc40f6.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:2704
- C:\Windows\splwow64.exe
  C:\Windows\splwow64.exe 12288
  2⤵
  PID:2264

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:2724
- C:\Users\Admin\AppData\Roaming\sinbless09185.exe
  "C:\Users\Admin\AppData\Roaming\sinbless09185.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2628
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\sinbless09185.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:2208
- - C:\Users\Admin\AppData\Roaming\sinbless09185.exe
    "C:\Users\Admin\AppData\Roaming\sinbless09185.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1756
  - - C:\Users\Admin\AppData\Roaming\sinbless09185.exe
      C:\Users\Admin\AppData\Roaming\sinbless09185.exe /stext "C:\Users\Admin\AppData\Local\Temp\noersnnxz"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      PID:2348
  - - C:\Users\Admin\AppData\Roaming\sinbless09185.exe
      C:\Users\Admin\AppData\Roaming\sinbless09185.exe /stext "C:\Users\Admin\AppData\Local\Temp\qjjclfyzngvbv"
      4⤵
      Executes dropped EXE
      Accesses Microsoft Outlook accounts
      System Location Discovery: System Language Discovery
      PID:2356
  - - C:\Users\Admin\AppData\Roaming\sinbless09185.exe
      C:\Users\Admin\AppData\Roaming\sinbless09185.exe /stext "C:\Users\Admin\AppData\Local\Temp\alwumyjsbonofzql"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      PID:2416

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
326B

MD5
101e07dfc0cf4903080694b01e0c2211

SHA1
1d0880bc0da3d52645cf788cdf6259018cdab428

SHA256
25cc6f496e12be028dfb18df0b7ebb16ae7f4cf962e7373b96d062a94f117f7f

SHA512
8349736a5c5701083615cba6a0b9bcb71d172619129ca246210870e091851b667d5b4b445369a1d3381623e36f1a6c2059d1ca2a5c9575500833f9493eab8132

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

Filesize
2B

MD5
f3b25701fe362ec84616a93a45ce9998

SHA1
d62636d8caec13f04e28442a0a6fa1afeb024bbb

SHA256
b3d510ef04275ca8e698e5b3cbb0ece3949ef9252f0cdc839e9ee347409a2209

SHA512
98c5f56f3de340690c139e58eb7dac111979f0d4dffe9c4b24ff849510f4b6ffa9fd608c0a3de9ac3c9fd2190f0efaf715309061490f9755a9bfdf1c54ca0d84

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Templates\Normal.dotm

Filesize
19KB

MD5
b96bd46bd9065840e79a44abdd7bb884

SHA1
87982c0f0f044dadaa84e5c64ceb61a9b333bd2e

SHA256
77c8f7d3cf63a4dcb5bf3c10e2b16092f368f80ca7c6b0b8d1926cf95fd7ef63

SHA512
9c7249bf726ea830f5ea43e9d63986e9f4a9b7b330bcc402175170a980a8fd6e6d7a51e0ed08aa7bd2026afb2736075dead7bd69d1ee9e6f7d69f8a0971363de

Download Submit
\Users\Admin\AppData\Roaming\sinbless09185.exe

Filesize
928KB

MD5
04d4d4d83e1601d220f83f09ae16cd79

SHA1
4f0a7d8060399a7ae5029690bdee2bf3b2e3e395

SHA256
86b19710e100964d95cfa01201152d4e73f1297f7286207feeb01cdb7e55efc8

SHA512
87747374bd1c72c9d33d2af9e7456617c95e6c100788f16123bf15cb1c6748a13ad1ac9b5a967553fdf668ea226033a741c08f45febc2130a7e50ccabe69333c

Download Submit
memory/1756-56-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-48-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-133-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-132-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-26-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-24-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-109-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-47-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-44-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-43-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-41-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-108-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-38-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-36-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-34-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-32-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-30-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-28-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-51-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-52-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-95-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-54-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-87-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-88-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-53-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-84-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1756-40-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1756-82-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/1756-83-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/1756-79-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/2348-65-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2348-59-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2348-70-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2356-64-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/2356-62-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/2356-66-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/2416-71-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/2416-72-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/2416-68-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/2628-13-0x000000006AA7E000-0x000000006AA7F000-memory.dmp

Filesize
4KB

Download
memory/2628-23-0x0000000000F40000-0x0000000001000000-memory.dmp

Filesize
768KB

Download
memory/2628-16-0x0000000000570000-0x0000000000588000-memory.dmp

Filesize
96KB

Download
memory/2628-22-0x000000006AA7E000-0x000000006AA7F000-memory.dmp

Filesize
4KB

Download
memory/2628-15-0x00000000011A0000-0x000000000128A000-memory.dmp

Filesize
936KB

Download
memory/2704-125-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/2704-0-0x000000002F111000-0x000000002F112000-memory.dmp

Filesize
4KB

Download
memory/2704-2-0x0000000070ACD000-0x0000000070AD8000-memory.dmp

Filesize
44KB

Download
memory/2704-21-0x0000000070ACD000-0x0000000070AD8000-memory.dmp

Filesize
44KB

Download
memory/2704-1-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download