remcos | f3eb9a68382f34573df266cecb1beab7225e89769cf883b7e7d077d436ecbe3b

General

Target

Request for Quotation and PO101024_ppt.scr
Size

1.7MB
MD5

6e6776e196f88bb6a23aeba0a588a7f9
SHA1

b65ba8d9ff41bccc1a4a7df6b22f83ba08802824
SHA256

991d410ddd280221d14b30dfa026484f3913911e9c9ea984b43542c3b7f4597e
SHA512

a24d8f0c1ce3c7579737dea0655148d20ddc85908aa49e34afdb79e8ddc747319f2a8798175dc0f344688fc041525fe9de667c61d2b3f3b5f6c96a69ef674291
SSDEEP

24576:vfmMv6Ckr7Mny5Q87sPX1Ir56Yl1ySmoIlaG/mUOXsWo1na3qiDrwOZQu4IHG:v3v+7/5Q87sP1C5LdOaG/U4xaV/44G

Score

10^/10

remcos mass_cl discovery rat

Malware Config

Extracted

Family

remcos

Botnet

mass_cl

C2

mass2024.duckdns.org:2025

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-ZTNDH8
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
Remcos
take_screenshot_option
false
take_screenshot_time
5

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos

Drops startup file 1 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\chordates.vbs	chordates.exe

Executes dropped EXE 2 IoCs

pid	Process
3880	chordates.exe
4828	chordates.exe

AutoIT Executable 1 IoCs

AutoIT scripts compiled to PE executables.

resource	yara_rule
behavioral2/files/0x000c000000023b50-5.dat	autoit_exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4828 set thread context of 1760	4828	chordates.exe	90

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2456	4828	WerFault.exe	89

System Location Discovery: System Language Discovery 1 TTPs 4 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	chordates.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Request for Quotation and PO101024_ppt.scr
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	chordates.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
3880	chordates.exe
4828	chordates.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 4008 wrote to memory of 3880	4008	Request for Quotation and PO101024_ppt.scr	87
PID 4008 wrote to memory of 3880	4008	Request for Quotation and PO101024_ppt.scr	87
PID 4008 wrote to memory of 3880	4008	Request for Quotation and PO101024_ppt.scr	87
PID 3880 wrote to memory of 3864	3880	chordates.exe	88
PID 3880 wrote to memory of 3864	3880	chordates.exe	88
PID 3880 wrote to memory of 3864	3880	chordates.exe	88
PID 3880 wrote to memory of 4828	3880	chordates.exe	89
PID 3880 wrote to memory of 4828	3880	chordates.exe	89
PID 3880 wrote to memory of 4828	3880	chordates.exe	89
PID 4828 wrote to memory of 1760	4828	chordates.exe	90
PID 4828 wrote to memory of 1760	4828	chordates.exe	90
PID 4828 wrote to memory of 1760	4828	chordates.exe	90
PID 4828 wrote to memory of 1760	4828	chordates.exe	90

C:\Users\Admin\AppData\Local\Temp\Request for Quotation and PO101024_ppt.scr
"C:\Users\Admin\AppData\Local\Temp\Request for Quotation and PO101024_ppt.scr" /S
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4008
- C:\Users\Admin\AppData\Local\Thebesian\chordates.exe
  "C:\Users\Admin\AppData\Local\Temp\Request for Quotation and PO101024_ppt.scr" /S
  2⤵
  - Drops startup file
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:3880
- - C:\Windows\SysWOW64\svchost.exe
    "C:\Users\Admin\AppData\Local\Temp\Request for Quotation and PO101024_ppt.scr" /S
    3⤵
    PID:3864
- - C:\Users\Admin\AppData\Local\Thebesian\chordates.exe
    "C:\Users\Admin\AppData\Local\Thebesian\chordates.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of WriteProcessMemory
    PID:4828
  - - C:\Windows\SysWOW64\svchost.exe
      "C:\Users\Admin\AppData\Local\Thebesian\chordates.exe"
      4⤵
      System Location Discovery: System Language Discovery
      PID:1760
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4828 -s 684
      4⤵
      Program crash
      PID:2456

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4828 -ip 4828
1⤵
PID:3360

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Thebesian\chordates.exe

Filesize
1.7MB

MD5
6e6776e196f88bb6a23aeba0a588a7f9

SHA1
b65ba8d9ff41bccc1a4a7df6b22f83ba08802824

SHA256
991d410ddd280221d14b30dfa026484f3913911e9c9ea984b43542c3b7f4597e

SHA512
a24d8f0c1ce3c7579737dea0655148d20ddc85908aa49e34afdb79e8ddc747319f2a8798175dc0f344688fc041525fe9de667c61d2b3f3b5f6c96a69ef674291

Download Submit
memory/1760-24-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1760-30-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1760-25-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1760-17-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1760-18-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1760-19-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1760-20-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1760-21-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1760-26-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1760-23-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1760-35-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1760-34-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1760-22-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1760-27-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1760-28-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1760-29-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1760-33-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1760-31-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1760-32-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3880-10-0x0000000004510000-0x0000000004910000-memory.dmp

Filesize
4.0MB

Download
memory/4008-2-0x0000000004550000-0x0000000004950000-memory.dmp

Filesize
4.0MB

Download
memory/4828-16-0x0000000004100000-0x0000000004500000-memory.dmp

Filesize
4.0MB

Download

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