remcos | a9fc803f335632186421fa99723dcf6025f6dc29c1bc6f2a36ee2d120920a842

General

Target

$PLUGINSDIR/c163.dll
Size

149KB
MD5

ff92e869d01daa3746d2cec2646ad093
SHA1

8550d250841652780bc92379fadf5a39244bc64e
SHA256

af33fde8b5a9f218f92278d6c1c17e91624242262fa65e9a770fb81b14b42bb4
SHA512

9899011426347267a98ca13c5dda0f20a3d9976e33c0be4aa21d4bfc656d094088403bf9cfb6f443efb4b24748b207a6af0f723bebfc7209baff334cdba16cdb
SSDEEP

3072:+xH0psiSorXyEpuxm/RyCcVAO91YaU5UM7eOFB8MrzItMyq/SB59Hnlf:5pHSmpuxm/RyCcVAOsa87/B8agMySArx

Score

10^/10

remcos new discovery rat

Malware Config

Extracted

Family

remcos

Version

2.7.2 Pro

Botnet

NEW

C2

insidelife1.ddns.net:2123

Attributes

audio_folder
MicRecords
audio_path
%AppData%
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
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
Remcos-FXFW4N
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
take_screenshot_title
wikipedia;solitaire;

Signatures

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

Blocklisted process makes network request 14 IoCs

flow	pid	Process
2	2836	rundll32.exe
20	2836	rundll32.exe
21	2836	rundll32.exe
35	2836	rundll32.exe
36	2836	rundll32.exe
37	2836	rundll32.exe
41	2836	rundll32.exe
42	2836	rundll32.exe
44	2836	rundll32.exe
47	2836	rundll32.exe
48	2836	rundll32.exe
49	2836	rundll32.exe
50	2836	rundll32.exe
51	2836	rundll32.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4792 set thread context of 2836	4792	rundll32.exe	83

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2340	4792	WerFault.exe	82

System Location Discovery: System Language Discovery 1 TTPs 2 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	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4792	rundll32.exe
4792	rundll32.exe
4792	rundll32.exe
4792	rundll32.exe
4792	rundll32.exe
4792	rundll32.exe
4792	rundll32.exe
4792	rundll32.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
4792	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 3336 wrote to memory of 4792	3336	rundll32.exe	82
PID 3336 wrote to memory of 4792	3336	rundll32.exe	82
PID 3336 wrote to memory of 4792	3336	rundll32.exe	82
PID 4792 wrote to memory of 2836	4792	rundll32.exe	83
PID 4792 wrote to memory of 2836	4792	rundll32.exe	83
PID 4792 wrote to memory of 2836	4792	rundll32.exe	83
PID 4792 wrote to memory of 2836	4792	rundll32.exe	83

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\c163.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:3336
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\c163.dll,#1
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:4792
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\c163.dll,#1
    3⤵
    - Blocklisted process makes network request
    - System Location Discovery: System Language Discovery
    PID:2836
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4792 -s 852
    3⤵
    - Program crash
    PID:2340

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 4792 -ip 4792
1⤵
PID:3060

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2836-12-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2836-26-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2836-34-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2836-16-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2836-14-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2836-6-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2836-32-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2836-8-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2836-9-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2836-10-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2836-3-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2836-5-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2836-4-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2836-18-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2836-20-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2836-22-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2836-1-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2836-28-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/2836-30-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/4792-7-0x0000000074FE0000-0x0000000074FEB000-memory.dmp

Filesize
44KB

Download
memory/4792-0-0x0000000074FE0000-0x0000000074FEB000-memory.dmp

Filesize
44KB

Download

Analysis

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