remcos | fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3

Analysis

max time kernel
147s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
29-11-2024 06:02

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General

Target

fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe
Size

219KB
MD5

116fb4bb7ec49045cb4f38e75c323cd2
SHA1

7c6790329e17004278f46b6194d3f0d670e6d888
SHA256

fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3
SHA512

688df7a22f9a08049951a0006e9608d9c24c31d7f2d19c369148307ffca139679f16dbd491ea277001676a5541fe13a0a31dff568041030963490bcecff5a7c6
SSDEEP

3072:jyYVDf4vVhU2mt6F6ncwxLW+GZyYyN4h2OJDoz+IUBek7nNtZRkn+t3+V2lMCV/N:jV4vVRPw5W+DYh2OJ2R+Zqn+l+V2FA

Score

10^/10

remcos remotehost collection discovery rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

41.216.183.238:7112

Attributes

audio_folder
MicRecords
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
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-Y7J88P
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

Signatures

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

Suspicious use of NtCreateUserProcessOtherParentProcess 1 IoCs

Processes:

fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe

description	pid	Process	procid_target
PID 3916 created 3452	3916	fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe	56

Detected Nirsoft tools 4 IoCs

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

Processes:

resource	yara_rule
behavioral2/memory/1300-1221-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/2116-1222-0x0000000000400000-0x0000000000457000-memory.dmp	Nirsoft
behavioral2/memory/2116-1229-0x0000000000400000-0x0000000000457000-memory.dmp	Nirsoft
behavioral2/memory/1300-1231-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

Processes:

resource	yara_rule
behavioral2/memory/2116-1222-0x0000000000400000-0x0000000000457000-memory.dmp	MailPassView
behavioral2/memory/2116-1229-0x0000000000400000-0x0000000000457000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 2 IoCs

Password recovery tool for various web browsers

Processes:

resource	yara_rule
behavioral2/memory/1300-1221-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/1300-1231-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Drops startup file 1 IoCs

Processes:

fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\StackTrace.vbs	fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

Processes:

InstallUtil.exe

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	InstallUtil.exe

Suspicious use of SetThreadContext 4 IoCs

Processes:

fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exeInstallUtil.exe

description	pid	Process	procid_target
PID 3916 set thread context of 5072	3916	fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe	89
PID 5072 set thread context of 1300	5072	InstallUtil.exe	90
PID 5072 set thread context of 2116	5072	InstallUtil.exe	91
PID 5072 set thread context of 4964	5072	InstallUtil.exe	93

System Location Discovery: System Language Discovery 1 TTPs 5 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

Processes:

fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exeInstallUtil.exeInstallUtil.exeInstallUtil.exeInstallUtil.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	InstallUtil.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	InstallUtil.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	InstallUtil.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	InstallUtil.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

Processes:

fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exeInstallUtil.exeInstallUtil.exe

pid	Process
3916	fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe
1300	InstallUtil.exe
1300	InstallUtil.exe
4964	InstallUtil.exe
4964	InstallUtil.exe
1300	InstallUtil.exe
1300	InstallUtil.exe

Suspicious behavior: MapViewOfSection 4 IoCs

Processes:

InstallUtil.exe

pid	Process
5072	InstallUtil.exe
5072	InstallUtil.exe
5072	InstallUtil.exe
5072	InstallUtil.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exeInstallUtil.exe

description	pid	Process
Token: SeDebugPrivilege	3916	fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe
Token: SeDebugPrivilege	3916	fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe
Token: SeDebugPrivilege	4964	InstallUtil.exe

Suspicious use of WriteProcessMemory 27 IoCs

Processes:

fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exeInstallUtil.exe

description	pid	Process	procid_target
PID 3916 wrote to memory of 5072	3916	fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe	89
PID 3916 wrote to memory of 5072	3916	fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe	89
PID 3916 wrote to memory of 5072	3916	fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe	89
PID 3916 wrote to memory of 5072	3916	fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe	89
PID 3916 wrote to memory of 5072	3916	fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe	89
PID 3916 wrote to memory of 5072	3916	fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe	89
PID 3916 wrote to memory of 5072	3916	fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe	89
PID 3916 wrote to memory of 5072	3916	fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe	89
PID 3916 wrote to memory of 5072	3916	fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe	89
PID 3916 wrote to memory of 5072	3916	fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe	89
PID 3916 wrote to memory of 5072	3916	fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe	89
PID 3916 wrote to memory of 5072	3916	fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe	89
PID 5072 wrote to memory of 1300	5072	InstallUtil.exe	90
PID 5072 wrote to memory of 1300	5072	InstallUtil.exe	90
PID 5072 wrote to memory of 1300	5072	InstallUtil.exe	90
PID 5072 wrote to memory of 1300	5072	InstallUtil.exe	90
PID 5072 wrote to memory of 2116	5072	InstallUtil.exe	91
PID 5072 wrote to memory of 2116	5072	InstallUtil.exe	91
PID 5072 wrote to memory of 2116	5072	InstallUtil.exe	91
PID 5072 wrote to memory of 2116	5072	InstallUtil.exe	91
PID 5072 wrote to memory of 2688	5072	InstallUtil.exe	92
PID 5072 wrote to memory of 2688	5072	InstallUtil.exe	92
PID 5072 wrote to memory of 2688	5072	InstallUtil.exe	92
PID 5072 wrote to memory of 4964	5072	InstallUtil.exe	93
PID 5072 wrote to memory of 4964	5072	InstallUtil.exe	93
PID 5072 wrote to memory of 4964	5072	InstallUtil.exe	93
PID 5072 wrote to memory of 4964	5072	InstallUtil.exe	93

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3452
- C:\Users\Admin\AppData\Local\Temp\fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe
  "C:\Users\Admin\AppData\Local\Temp\fffdc25e76135df50ce2849a2ec4766ddc1b422e42985b18d8b932e3ffb9b7e3.exe"
  2⤵
  - Suspicious use of NtCreateUserProcessOtherParentProcess
  - Drops startup file
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3916
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:5072
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe /stext "C:\Users\Admin\AppData\Local\Temp\vyoimxgmszdpirmeimcxbowtshkpb"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    PID:1300
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe /stext "C:\Users\Admin\AppData\Local\Temp\fatanirnnivusxiqrwpymarkbnbquggx"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:2116
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe /stext "C:\Users\Admin\AppData\Local\Temp\puyl"
    3⤵
    PID:2688
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
    C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe /stext "C:\Users\Admin\AppData\Local\Temp\puyl"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4964

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
4KB

MD5
7aca43b2800ceb18b3ed2326532545de

SHA1
d4cf207ef85bd749d59c1cb27a09c167ee21523a

SHA256
3d9f8622d97587fd84d3d0560a50ab38e5f894fe4b5bcaa34279643fdaaeb480

SHA512
0e002e6b8d965c227d9b1aa7c0251619c787ec7717e59667e756e5815e3666a955ea397eb148a1ed6bb7d8045727e4efa656a103f14bc70a03b03f0c91283c2f

Download Submit
memory/1300-1221-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1300-1231-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2116-1222-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/2116-1229-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/3916-45-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-1198-0x0000000075220000-0x00000000759D0000-memory.dmp

Filesize
7.7MB

Download
memory/3916-39-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-3-0x0000000005750000-0x00000000057E2000-memory.dmp

Filesize
584KB

Download
memory/3916-4-0x0000000075220000-0x00000000759D0000-memory.dmp

Filesize
7.7MB

Download
memory/3916-5-0x0000000005800000-0x000000000580A000-memory.dmp

Filesize
40KB

Download
memory/3916-6-0x00000000057F0000-0x00000000057F6000-memory.dmp

Filesize
24KB

Download
memory/3916-7-0x0000000007350000-0x0000000007476000-memory.dmp

Filesize
1.1MB

Download
memory/3916-17-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-8-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-25-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-71-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-69-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-67-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-65-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-61-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-59-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-57-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-55-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-53-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-63-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-51-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-47-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-0-0x000000007522E000-0x000000007522F000-memory.dmp

Filesize
4KB

Download
memory/3916-43-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-41-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-2-0x0000000005E30000-0x00000000063D4000-memory.dmp

Filesize
5.6MB

Download
memory/3916-1-0x0000000000D30000-0x0000000000D6C000-memory.dmp

Filesize
240KB

Download
memory/3916-1187-0x000000007522E000-0x000000007522F000-memory.dmp

Filesize
4KB

Download
memory/3916-33-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-31-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-29-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-23-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-21-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-19-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-15-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-13-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-11-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-9-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-49-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-27-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-1184-0x0000000075220000-0x00000000759D0000-memory.dmp

Filesize
7.7MB

Download
memory/3916-1185-0x0000000007550000-0x00000000075E6000-memory.dmp

Filesize
600KB

Download
memory/3916-1186-0x00000000075F0000-0x000000000763C000-memory.dmp

Filesize
304KB

Download
memory/3916-35-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-1188-0x0000000075220000-0x00000000759D0000-memory.dmp

Filesize
7.7MB

Download
memory/3916-1189-0x0000000075220000-0x00000000759D0000-memory.dmp

Filesize
7.7MB

Download
memory/3916-1190-0x0000000007800000-0x0000000007854000-memory.dmp

Filesize
336KB

Download
memory/3916-1196-0x0000000075220000-0x00000000759D0000-memory.dmp

Filesize
7.7MB

Download
memory/3916-37-0x0000000007350000-0x0000000007470000-memory.dmp

Filesize
1.1MB

Download
memory/3916-1200-0x0000000075220000-0x00000000759D0000-memory.dmp

Filesize
7.7MB

Download
memory/3916-1205-0x0000000075220000-0x00000000759D0000-memory.dmp

Filesize
7.7MB

Download
memory/5072-1206-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/5072-1234-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download