remcos | 04e38a46f1d87b04ca0f03caf92c9ae10d836de1efe9267562a4e2f2bef548a1

General

Target

02b4e1709e79653e9569bf727301f92d4928726ba69d8d764db5841b94d63671.exe
Size

482KB
MD5

13095aaded59fb08db07ecf6bc2387ef
SHA1

13466ec6545a05da5d8ea49a8ec6c56c4f9aa648
SHA256

02b4e1709e79653e9569bf727301f92d4928726ba69d8d764db5841b94d63671
SHA512

fe10e40072e12c68edd3c3fcb9583253a4ee9fd7ec42f2a423829202abedf443c654968acb44919ad8ba3ecafa77c95b7fd2b8b641dd83779960363c0bb11bf0
SSDEEP

6144:iTz+c6KHYBhDc1RGJdv//NkUn+N5Bkf/0TELRvIZPjbsAOZZXAXkcr/T4:iTlrYw1RUh3NFn+N5WfIQIjbs/ZXgT4

Score

10^/10

remcos remotehost discovery persistence rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

liveos.zapto.org:2404

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
tst
delete_file
false
hide_file
true
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-Y7B4RN
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

Adds policy Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Rmc-Y7B4RN = "\"C:\\ProgramData\\tst\\remcos.exe\""	02b4e1709e79653e9569bf727301f92d4928726ba69d8d764db5841b94d63671.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	remcos.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Rmc-Y7B4RN = "\"C:\\ProgramData\\tst\\remcos.exe\""	remcos.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	02b4e1709e79653e9569bf727301f92d4928726ba69d8d764db5841b94d63671.exe

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-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	02b4e1709e79653e9569bf727301f92d4928726ba69d8d764db5841b94d63671.exe

Executes dropped EXE 1 IoCs

pid	Process
3796	remcos.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Rmc-Y7B4RN = "\"C:\\ProgramData\\tst\\remcos.exe\""	remcos.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Rmc-Y7B4RN = "\"C:\\ProgramData\\tst\\remcos.exe\""	remcos.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Rmc-Y7B4RN = "\"C:\\ProgramData\\tst\\remcos.exe\""	02b4e1709e79653e9569bf727301f92d4928726ba69d8d764db5841b94d63671.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Rmc-Y7B4RN = "\"C:\\ProgramData\\tst\\remcos.exe\""	02b4e1709e79653e9569bf727301f92d4928726ba69d8d764db5841b94d63671.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3796 set thread context of 2524	3796	remcos.exe	88

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 3 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	02b4e1709e79653e9569bf727301f92d4928726ba69d8d764db5841b94d63671.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	remcos.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	iexplore.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance\	02b4e1709e79653e9569bf727301f92d4928726ba69d8d764db5841b94d63671.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3796	remcos.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 4228 wrote to memory of 3796	4228	02b4e1709e79653e9569bf727301f92d4928726ba69d8d764db5841b94d63671.exe	87
PID 4228 wrote to memory of 3796	4228	02b4e1709e79653e9569bf727301f92d4928726ba69d8d764db5841b94d63671.exe	87
PID 4228 wrote to memory of 3796	4228	02b4e1709e79653e9569bf727301f92d4928726ba69d8d764db5841b94d63671.exe	87
PID 3796 wrote to memory of 2524	3796	remcos.exe	88
PID 3796 wrote to memory of 2524	3796	remcos.exe	88
PID 3796 wrote to memory of 2524	3796	remcos.exe	88
PID 3796 wrote to memory of 2524	3796	remcos.exe	88

C:\Users\Admin\AppData\Local\Temp\02b4e1709e79653e9569bf727301f92d4928726ba69d8d764db5841b94d63671.exe
"C:\Users\Admin\AppData\Local\Temp\02b4e1709e79653e9569bf727301f92d4928726ba69d8d764db5841b94d63671.exe"
1⤵
- Adds policy Run key to start application
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4228
- C:\ProgramData\tst\remcos.exe
  "C:\ProgramData\tst\remcos.exe"
  2⤵
  - Adds policy Run key to start application
  - 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:3796
- - \??\c:\program files (x86)\internet explorer\iexplore.exe
    "c:\program files (x86)\internet explorer\iexplore.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2524

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Defense Evasion

Modify Registry

2

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:\ProgramData\tst\remcos.exe

Filesize
482KB

MD5
13095aaded59fb08db07ecf6bc2387ef

SHA1
13466ec6545a05da5d8ea49a8ec6c56c4f9aa648

SHA256
02b4e1709e79653e9569bf727301f92d4928726ba69d8d764db5841b94d63671

SHA512
fe10e40072e12c68edd3c3fcb9583253a4ee9fd7ec42f2a423829202abedf443c654968acb44919ad8ba3ecafa77c95b7fd2b8b641dd83779960363c0bb11bf0

Download Submit
memory/2524-33-0x0000000000C90000-0x0000000000D12000-memory.dmp

Filesize
520KB

Download
memory/2524-35-0x0000000000C90000-0x0000000000D12000-memory.dmp

Filesize
520KB

Download
memory/2524-34-0x0000000000C90000-0x0000000000D12000-memory.dmp

Filesize
520KB

Download
memory/2524-36-0x0000000000C90000-0x0000000000D12000-memory.dmp

Filesize
520KB

Download
memory/2524-37-0x0000000000C90000-0x0000000000D12000-memory.dmp

Filesize
520KB

Download
memory/2524-38-0x0000000000C90000-0x0000000000D12000-memory.dmp

Filesize
520KB

Download
memory/2524-39-0x0000000000C90000-0x0000000000D12000-memory.dmp

Filesize
520KB

Download
memory/2524-40-0x0000000000C90000-0x0000000000D12000-memory.dmp

Filesize
520KB

Download
memory/2524-41-0x0000000000C90000-0x0000000000D12000-memory.dmp

Filesize
520KB

Download
memory/2524-44-0x0000000000C90000-0x0000000000D12000-memory.dmp

Filesize
520KB

Download
memory/2524-45-0x0000000000C90000-0x0000000000D12000-memory.dmp

Filesize
520KB

Download
memory/2524-46-0x0000000000C90000-0x0000000000D12000-memory.dmp

Filesize
520KB

Download
memory/2524-47-0x0000000000C90000-0x0000000000D12000-memory.dmp

Filesize
520KB

Download
memory/2524-48-0x0000000000C90000-0x0000000000D12000-memory.dmp

Filesize
520KB

Download
memory/2524-49-0x0000000000C90000-0x0000000000D12000-memory.dmp

Filesize
520KB

Download
memory/2524-50-0x0000000000C90000-0x0000000000D12000-memory.dmp

Filesize
520KB

Download
memory/2524-51-0x0000000000C90000-0x0000000000D12000-memory.dmp

Filesize
520KB

Download
memory/2524-52-0x0000000000C90000-0x0000000000D12000-memory.dmp

Filesize
520KB

Download
memory/2524-53-0x0000000000C90000-0x0000000000D12000-memory.dmp

Filesize
520KB

Download
memory/2524-54-0x0000000000C90000-0x0000000000D12000-memory.dmp

Filesize
520KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads