remcos | ec8ecee61aeab54e0622706710e9cbe56cdda7d2b47c5d13ef343092c868120c

General

Target

a.exe
Size

453KB
MD5

02d693c186871b0aba2101233ee64173
SHA1

f5786f6346286e9e61f2c4cde7cf0dd877d103da
SHA256

ec8ecee61aeab54e0622706710e9cbe56cdda7d2b47c5d13ef343092c868120c
SHA512

aa2948a490ed50dbfc8568ee9c521ab52e136894cb5f012d0879640cda5af5de1c41579dbe463bfe15580c51b892155e39bf0bfa883f5fd79d37285b2abeb768
SSDEEP

12288:Emnk7iLJbpIpiRL6I2WhSKQ9ZsfZQSbn9:8iLJbpI7I2WhQqZ7b9

Score

10^/10

remcos new discovery persistence rat

Malware Config

Extracted

Family

remcos

Botnet

New

C2

173.212.217.108:1050

zab4ever.no-ip.org:1050

1zab4ever.no-ip.org:1050

1zab4ever.duckdns.org:1050

Attributes

audio_folder
MicRecords
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
BrowseUpdt.exe
delete_file
false
hide_file
true
hide_keylog_file
true
install_flag
true
install_path
%AppData%
keylog_crypt
false
keylog_file
nobita.dat
keylog_flag
false
keylog_path
%AppData%
mouse_option
false
mutex
khruioprs-T021C4
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
BrowseUpdt
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title
notepad;solitaire;

Signatures

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

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-355097885-2402257403-2971294179-1000\Control Panel\International\Geo\Nation	a.exe
Key value queried	\REGISTRY\USER\S-1-5-21-355097885-2402257403-2971294179-1000\Control Panel\International\Geo\Nation	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
3408	BrowseUpdt.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-355097885-2402257403-2971294179-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\BrowseUpdt = "\"C:\\Users\\Admin\\AppData\\Roaming\\BrowseUpdt.exe\""	a.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-355097885-2402257403-2971294179-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\BrowseUpdt = "\"C:\\Users\\Admin\\AppData\\Roaming\\BrowseUpdt.exe\""	BrowseUpdt.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3408 set thread context of 636	3408	BrowseUpdt.exe	90

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 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	a.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	BrowseUpdt.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-355097885-2402257403-2971294179-1000_Classes\Local Settings	a.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3408	BrowseUpdt.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 4248 wrote to memory of 3760	4248	a.exe	83
PID 4248 wrote to memory of 3760	4248	a.exe	83
PID 4248 wrote to memory of 3760	4248	a.exe	83
PID 3760 wrote to memory of 1816	3760	WScript.exe	87
PID 3760 wrote to memory of 1816	3760	WScript.exe	87
PID 3760 wrote to memory of 1816	3760	WScript.exe	87
PID 1816 wrote to memory of 3408	1816	cmd.exe	89
PID 1816 wrote to memory of 3408	1816	cmd.exe	89
PID 1816 wrote to memory of 3408	1816	cmd.exe	89
PID 3408 wrote to memory of 636	3408	BrowseUpdt.exe	90
PID 3408 wrote to memory of 636	3408	BrowseUpdt.exe	90
PID 3408 wrote to memory of 636	3408	BrowseUpdt.exe	90
PID 3408 wrote to memory of 636	3408	BrowseUpdt.exe	90

C:\Users\Admin\AppData\Local\Temp\a.exe
"C:\Users\Admin\AppData\Local\Temp\a.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4248
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3760
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\BrowseUpdt.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1816
  - - C:\Users\Admin\AppData\Roaming\BrowseUpdt.exe
      C:\Users\Admin\AppData\Roaming\BrowseUpdt.exe
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious behavior: MapViewOfSection
      Suspicious use of WriteProcessMemory
      PID:3408
    - - \??\c:\program files (x86)\internet explorer\iexplore.exe
        
        "c:\program files (x86)\internet explorer\iexplore.exe"
        5⤵
        
        PID:636

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

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\Temp\install.vbs

Filesize
412B

MD5
983609782eefdfb08a07ef630996dc0c

SHA1
47d060bf4d7ce66d807aa246e4a78ce3c1ac29b0

SHA256
38b85ad30d0626119e9e2f40b5b5a4279ae2f1929bf623083568cd3b1c3bf935

SHA512
ebadf7e339214da369e25ab6ca2bc19799d99e2e4fffc9b79d57e747eacdb62aa3fd41d1efae4250ac0536a0b60e541b4a5b2323ea59c09f2fdb8fdee248733d

Download Submit
C:\Users\Admin\AppData\Roaming\BrowseUpdt.exe

Filesize
453KB

MD5
02d693c186871b0aba2101233ee64173

SHA1
f5786f6346286e9e61f2c4cde7cf0dd877d103da

SHA256
ec8ecee61aeab54e0622706710e9cbe56cdda7d2b47c5d13ef343092c868120c

SHA512
aa2948a490ed50dbfc8568ee9c521ab52e136894cb5f012d0879640cda5af5de1c41579dbe463bfe15580c51b892155e39bf0bfa883f5fd79d37285b2abeb768

Download Submit
memory/636-12-0x0000000000D00000-0x0000000000D7B000-memory.dmp

Filesize
492KB

Download
memory/636-11-0x0000000000D00000-0x0000000000D7B000-memory.dmp

Filesize
492KB

Download
memory/636-10-0x0000000000D00000-0x0000000000D7B000-memory.dmp

Filesize
492KB

Download
memory/636-9-0x0000000000D00000-0x0000000000D7B000-memory.dmp

Filesize
492KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads