remcos | 2e5a027c69c4689e63e3db83608d73bf1fc0e47e9aeea1b59f864545a98f9893

General

Target

sample.exe
Size

1.1MB
MD5

0b17bf78d7ca53d04fa8b4b3326bd1da
SHA1

09f3d099f31bc9b1a92ef1f4e2bed3ce70426311
SHA256

51dde1b287583c1f27658bf5083e30e967beef56b53e02921721b7be5b4338ca
SHA512

21431db469c3b3d788db925f0bf6bdb2b314618973dcaefbe528eae76003c5d74e329e40c3319a4ad24a5a031b9c71aa1ca8342595ed95cd1be9781fbcff66f8
SSDEEP

24576:G4kClmLnsvxDw4AlDEdDLA92mwlzKBKuxAw//w:G6m3EdDLA92tld0/w

Score

10^/10

remcos remotehost discovery persistence rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

newpage44.mywire.org:5010

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
skype.exe
copy_folder
skype
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
true
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-GRUM7D
screenshot_crypt
false
screenshot_flag
true
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

Checks computer location settings 2 TTPs 1 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-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	sample.exe

Executes dropped EXE 1 IoCs

pid	Process
2556	skype.exe

Adds Run key to start application 2 TTPs 5 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Mwjytmtl = "C:\\Users\\Public\\Mwjytmtl.url"	sample.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Rmc-GRUM7D = "\"C:\\ProgramData\\skype\\skype.exe\""	sample.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Rmc-GRUM7D = "\"C:\\ProgramData\\skype\\skype.exe\""	sample.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Rmc-GRUM7D = "\"C:\\ProgramData\\skype\\skype.exe\""	skype.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Rmc-GRUM7D = "\"C:\\ProgramData\\skype\\skype.exe\""	skype.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 3 IoCs

Web Service

T1102

flow	ioc
27	drive.google.com
30	drive.google.com
52	drive.google.com

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2556 set thread context of 2568	2556	skype.exe	108

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	sample.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	extrac32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	skype.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe

Script User-Agent 4 IoCs

Uses user-agent string associated with script host/environment.

description	flow	ioc
HTTP User-Agent header	30	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	32	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	52	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	53	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2556	skype.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2556	skype.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2840 wrote to memory of 2088	2840	sample.exe	101
PID 2840 wrote to memory of 2088	2840	sample.exe	101
PID 2840 wrote to memory of 2088	2840	sample.exe	101
PID 2840 wrote to memory of 2556	2840	sample.exe	102
PID 2840 wrote to memory of 2556	2840	sample.exe	102
PID 2840 wrote to memory of 2556	2840	sample.exe	102
PID 2556 wrote to memory of 2568	2556	skype.exe	108
PID 2556 wrote to memory of 2568	2556	skype.exe	108
PID 2556 wrote to memory of 2568	2556	skype.exe	108
PID 2556 wrote to memory of 2568	2556	skype.exe	108

C:\Users\Admin\AppData\Local\Temp\sample.exe
"C:\Users\Admin\AppData\Local\Temp\sample.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2840
- C:\Windows\SysWOW64\extrac32.exe
  C:\\Windows\\System32\\extrac32.exe /C /Y C:\Users\Admin\AppData\Local\Temp\sample.exe C:\\Users\\Public\\Libraries\\Mwjytmtl.PIF
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2088
- C:\ProgramData\skype\skype.exe
  "C:\ProgramData\skype\skype.exe"
  2⤵
  - 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 SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2556
- - C:\Windows\SysWOW64\svchost.exe
    svchost.exe
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2568

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

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
16ba242075670a8fa6e8c69aac03519e

SHA1
1bf881d9aeb77d5a3298227a9dba982a2c83925b

SHA256
1a058e4ac29c1ca029da5b13205d5dbb90c37b87ef47fe36296c91e6930f2e87

SHA512
a52f0718811e03809bc92d99608224ef8483125de38556029ed272c528ad0480d9f16829e1cba10f48b286eab00346c05ef7dafe60055a37fb914c558f29d4da

Download Submit
C:\ProgramData\skype\skype.exe

Filesize
1.1MB

MD5
0b17bf78d7ca53d04fa8b4b3326bd1da

SHA1
09f3d099f31bc9b1a92ef1f4e2bed3ce70426311

SHA256
51dde1b287583c1f27658bf5083e30e967beef56b53e02921721b7be5b4338ca

SHA512
21431db469c3b3d788db925f0bf6bdb2b314618973dcaefbe528eae76003c5d74e329e40c3319a4ad24a5a031b9c71aa1ca8342595ed95cd1be9781fbcff66f8

Download Submit
memory/2556-47-0x00000000273E0000-0x00000000283E0000-memory.dmp

Filesize
16.0MB

Download
memory/2556-29-0x00000000273E0000-0x00000000283E0000-memory.dmp

Filesize
16.0MB

Download
memory/2556-18-0x0000000002220000-0x0000000002221000-memory.dmp

Filesize
4KB

Download
memory/2556-20-0x0000000002220000-0x0000000002221000-memory.dmp

Filesize
4KB

Download
memory/2556-19-0x0000000000400000-0x0000000000522000-memory.dmp

Filesize
1.1MB

Download
memory/2556-22-0x00000000273E0000-0x00000000283E0000-memory.dmp

Filesize
16.0MB

Download
memory/2556-26-0x00000000273E0000-0x00000000283E0000-memory.dmp

Filesize
16.0MB

Download
memory/2556-65-0x00000000273E0000-0x00000000283E0000-memory.dmp

Filesize
16.0MB

Download
memory/2556-64-0x00000000273E0000-0x00000000283E0000-memory.dmp

Filesize
16.0MB

Download
memory/2556-57-0x00000000273E0000-0x00000000283E0000-memory.dmp

Filesize
16.0MB

Download
memory/2556-39-0x00000000273E0000-0x00000000283E0000-memory.dmp

Filesize
16.0MB

Download
memory/2556-40-0x00000000273E0000-0x00000000283E0000-memory.dmp

Filesize
16.0MB

Download
memory/2556-56-0x00000000273E0000-0x00000000283E0000-memory.dmp

Filesize
16.0MB

Download
memory/2556-48-0x00000000273E0000-0x00000000283E0000-memory.dmp

Filesize
16.0MB

Download
memory/2568-30-0x0000000000C00000-0x0000000000D22000-memory.dmp

Filesize
1.1MB

Download
memory/2568-31-0x0000000000C00000-0x0000000000D22000-memory.dmp

Filesize
1.1MB

Download
memory/2840-0-0x0000000000A30000-0x0000000000A31000-memory.dmp

Filesize
4KB

Download
memory/2840-2-0x0000000000A30000-0x0000000000A31000-memory.dmp

Filesize
4KB

Download
memory/2840-1-0x0000000000400000-0x0000000000522000-memory.dmp

Filesize
1.1MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads