remcos | a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56

Analysis

max time kernel
148s
max time network
142s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
16-01-2025 20:25

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General

Target

a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe
Size

1.1MB
MD5

66aff0e90decb079688df9612f05d07c
SHA1

4bb0f61caccb4d181d13fc5a0accddc4255cfdf0
SHA256

a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56
SHA512

dab0577293d003e11cd530c6f47dfeb9bb0bba9365a6c934c13f554e3cd3b253db872afea2091bb264f4df65b1e39ce88401af7773bf6f03130f7a40235775fa
SSDEEP

24576:yOVfUoQxO//54Iz38DL1s7S7eLNehb7Xkjp46sevoVQGEb:hVfUVO//++qL1aLQhb7XkjpoelPb

Score

10^/10

remcos remotehost collection discovery persistence rat spyware stealer

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

45.88.186.186:2404

Attributes

audio_folder
MicRecords
audio_path
ApplicationPath
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
true
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-AI2568
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
Remcos family
remcos

Detected Nirsoft tools 3 IoCs

Free utilities often used by attackers which can steal passwords, product keys, etc.

resource	yara_rule
behavioral1/memory/1180-75-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral1/memory/1080-70-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral1/memory/2956-69-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

NirSoft MailPassView 1 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/1080-70-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 1 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral1/memory/2956-69-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Executes dropped EXE 5 IoCs

pid	Process
2736	remcos.exe
2668	remcos.exe
2956	remcos.exe
1080	remcos.exe
1180	remcos.exe

Loads dropped DLL 1 IoCs

pid	Process
2884	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	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-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Run\Rmc-AI2568 = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Rmc-AI2568 = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Run\Rmc-AI2568 = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	remcos.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Rmc-AI2568 = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	remcos.exe

Suspicious use of SetThreadContext 5 IoCs

description	pid	Process	procid_target
PID 2556 set thread context of 2884	2556	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe	31
PID 2736 set thread context of 2668	2736	remcos.exe	33
PID 2668 set thread context of 2956	2668	remcos.exe	34
PID 2668 set thread context of 1080	2668	remcos.exe	35
PID 2668 set thread context of 1180	2668	remcos.exe	36

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 7 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	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	remcos.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	remcos.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	remcos.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	remcos.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	remcos.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2956	remcos.exe
2956	remcos.exe

Suspicious behavior: MapViewOfSection 3 IoCs

pid	Process
2668	remcos.exe
2668	remcos.exe
2668	remcos.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1180	remcos.exe

Suspicious use of WriteProcessMemory 41 IoCs

description	pid	Process	procid_target
PID 2556 wrote to memory of 2884	2556	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe	31
PID 2556 wrote to memory of 2884	2556	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe	31
PID 2556 wrote to memory of 2884	2556	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe	31
PID 2556 wrote to memory of 2884	2556	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe	31
PID 2556 wrote to memory of 2884	2556	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe	31
PID 2556 wrote to memory of 2884	2556	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe	31
PID 2556 wrote to memory of 2884	2556	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe	31
PID 2556 wrote to memory of 2884	2556	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe	31
PID 2556 wrote to memory of 2884	2556	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe	31
PID 2556 wrote to memory of 2884	2556	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe	31
PID 2556 wrote to memory of 2884	2556	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe	31
PID 2884 wrote to memory of 2736	2884	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe	32
PID 2884 wrote to memory of 2736	2884	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe	32
PID 2884 wrote to memory of 2736	2884	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe	32
PID 2884 wrote to memory of 2736	2884	a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe	32
PID 2736 wrote to memory of 2668	2736	remcos.exe	33
PID 2736 wrote to memory of 2668	2736	remcos.exe	33
PID 2736 wrote to memory of 2668	2736	remcos.exe	33
PID 2736 wrote to memory of 2668	2736	remcos.exe	33
PID 2736 wrote to memory of 2668	2736	remcos.exe	33
PID 2736 wrote to memory of 2668	2736	remcos.exe	33
PID 2736 wrote to memory of 2668	2736	remcos.exe	33
PID 2736 wrote to memory of 2668	2736	remcos.exe	33
PID 2736 wrote to memory of 2668	2736	remcos.exe	33
PID 2736 wrote to memory of 2668	2736	remcos.exe	33
PID 2736 wrote to memory of 2668	2736	remcos.exe	33
PID 2668 wrote to memory of 2956	2668	remcos.exe	34
PID 2668 wrote to memory of 2956	2668	remcos.exe	34
PID 2668 wrote to memory of 2956	2668	remcos.exe	34
PID 2668 wrote to memory of 2956	2668	remcos.exe	34
PID 2668 wrote to memory of 2956	2668	remcos.exe	34
PID 2668 wrote to memory of 1080	2668	remcos.exe	35
PID 2668 wrote to memory of 1080	2668	remcos.exe	35
PID 2668 wrote to memory of 1080	2668	remcos.exe	35
PID 2668 wrote to memory of 1080	2668	remcos.exe	35
PID 2668 wrote to memory of 1080	2668	remcos.exe	35
PID 2668 wrote to memory of 1180	2668	remcos.exe	36
PID 2668 wrote to memory of 1180	2668	remcos.exe	36
PID 2668 wrote to memory of 1180	2668	remcos.exe	36
PID 2668 wrote to memory of 1180	2668	remcos.exe	36
PID 2668 wrote to memory of 1180	2668	remcos.exe	36

C:\Users\Admin\AppData\Local\Temp\a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe
"C:\Users\Admin\AppData\Local\Temp\a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2556
- C:\Users\Admin\AppData\Local\Temp\a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe
  "C:\Users\Admin\AppData\Local\Temp\a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56.exe"
  2⤵
  - Loads dropped DLL
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2884
- - C:\ProgramData\Remcos\remcos.exe
    "C:\ProgramData\Remcos\remcos.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2736
  - - C:\ProgramData\Remcos\remcos.exe
      "C:\ProgramData\Remcos\remcos.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:2668
    - - C:\ProgramData\Remcos\remcos.exe
        
        C:\ProgramData\Remcos\remcos.exe /stext "C:\Users\Admin\AppData\Local\Temp\kcju"
        5⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious behavior: EnumeratesProcesses
        
        PID:2956
    - - C:\ProgramData\Remcos\remcos.exe
        
        C:\ProgramData\Remcos\remcos.exe /stext "C:\Users\Admin\AppData\Local\Temp\vwomngu"
        5⤵
        Executes dropped EXE
        Accesses Microsoft Outlook accounts
        System Location Discovery: System Language Discovery
        
        PID:1080
    - - C:\ProgramData\Remcos\remcos.exe
        
        C:\ProgramData\Remcos\remcos.exe /stext "C:\Users\Admin\AppData\Local\Temp\xytxozeeem"
        5⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious use of AdjustPrivilegeToken
        
        PID:1180

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\kcju

Filesize
2B

MD5
f3b25701fe362ec84616a93a45ce9998

SHA1
d62636d8caec13f04e28442a0a6fa1afeb024bbb

SHA256
b3d510ef04275ca8e698e5b3cbb0ece3949ef9252f0cdc839e9ee347409a2209

SHA512
98c5f56f3de340690c139e58eb7dac111979f0d4dffe9c4b24ff849510f4b6ffa9fd608c0a3de9ac3c9fd2190f0efaf715309061490f9755a9bfdf1c54ca0d84

Download Submit
\ProgramData\Remcos\remcos.exe

Filesize
1.1MB

MD5
66aff0e90decb079688df9612f05d07c

SHA1
4bb0f61caccb4d181d13fc5a0accddc4255cfdf0

SHA256
a06fb9ab4121eb7b90558e381602d8b04c9823070cfc71f7c233318b84d8cb56

SHA512
dab0577293d003e11cd530c6f47dfeb9bb0bba9365a6c934c13f554e3cd3b253db872afea2091bb264f4df65b1e39ce88401af7773bf6f03130f7a40235775fa

Download Submit
memory/1080-65-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/1080-68-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/1080-70-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/1180-75-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/1180-74-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/1180-72-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/2556-6-0x0000000004910000-0x00000000049D2000-memory.dmp

Filesize
776KB

Download
memory/2556-2-0x0000000074520000-0x0000000074C0E000-memory.dmp

Filesize
6.9MB

Download
memory/2556-3-0x00000000004F0000-0x0000000000516000-memory.dmp

Filesize
152KB

Download
memory/2556-5-0x0000000074520000-0x0000000074C0E000-memory.dmp

Filesize
6.9MB

Download
memory/2556-1-0x0000000010A80000-0x0000000010BA2000-memory.dmp

Filesize
1.1MB

Download
memory/2556-4-0x000000007452E000-0x000000007452F000-memory.dmp

Filesize
4KB

Download
memory/2556-0-0x000000007452E000-0x000000007452F000-memory.dmp

Filesize
4KB

Download
memory/2556-27-0x0000000074520000-0x0000000074C0E000-memory.dmp

Filesize
6.9MB

Download
memory/2668-53-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2668-90-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2668-94-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2668-84-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/2668-92-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2668-85-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/2668-86-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2668-49-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2668-52-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2668-54-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2668-91-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2668-56-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2668-55-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2668-57-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2668-58-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2668-60-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2668-81-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/2668-89-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2668-88-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2668-87-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2736-36-0x00000000744DE000-0x00000000744DF000-memory.dmp

Filesize
4KB

Download
memory/2736-35-0x0000000010810000-0x0000000010932000-memory.dmp

Filesize
1.1MB

Download
memory/2736-34-0x00000000744DE000-0x00000000744DF000-memory.dmp

Filesize
4KB

Download
memory/2884-15-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2884-11-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2884-13-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2884-7-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2884-10-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2884-23-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2884-24-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2884-21-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2884-19-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2884-17-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2884-32-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2956-69-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2956-61-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2956-62-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2956-67-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download