remcos | b54acfe94e3126a7a74935f4482e36513b3e6933af09a69a15dba8a7f4db4458

Analysis

max time kernel
149s
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
03-12-2024 11:42

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General

Target

yiivdk.exe
Size

1.3MB
MD5

22ee58313edbd477e6a1ed76a1f9218f
SHA1

f22e39af8b06e1c471138c820e59bb2abcb15a01
SHA256

b54acfe94e3126a7a74935f4482e36513b3e6933af09a69a15dba8a7f4db4458
SHA512

12c5ccb66a32a666c2a375ca74d02b10e19b872087738739d58d43c81dd00685b3731888e5b375b398a381e7aa82c25066fff430850caa38a9af5736833ffa01
SSDEEP

24576:C2YbBZNbCLvA8pHmGguYNBcR80G9Ps6IZWtu7vSvmgJC9KicB7yd:C2YbBZNuDtm1uKBE80G9bIYtu7qmgJCQ

Score

10^/10

remcos remotehost collection discovery rat spyware stealer

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

41.216.183.218:56792

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-I5RS8V
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:

yiivdk.exe

description	pid	Process	procid_target
PID 2100 created 3488	2100	yiivdk.exe	56

Detected Nirsoft tools 3 IoCs

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

Processes:

resource	yara_rule
behavioral2/memory/4776-1225-0x0000000000400000-0x0000000000457000-memory.dmp	Nirsoft
behavioral2/memory/3992-1224-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/3992-1227-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

NirSoft MailPassView 1 IoCs

Password recovery tool for various email clients

Processes:

resource	yara_rule
behavioral2/memory/4776-1225-0x0000000000400000-0x0000000000457000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 2 IoCs

Password recovery tool for various web browsers

Processes:

resource	yara_rule
behavioral2/memory/3992-1224-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/3992-1227-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Drops startup file 1 IoCs

Processes:

yiivdk.exe

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

Processes:

yiivdk.exe

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

Suspicious use of SetThreadContext 4 IoCs

Processes:

yiivdk.exeyiivdk.exe

description	pid	Process	procid_target
PID 2100 set thread context of 3440	2100	yiivdk.exe	82
PID 3440 set thread context of 3992	3440	yiivdk.exe	83
PID 3440 set thread context of 4776	3440	yiivdk.exe	85
PID 3440 set thread context of 5028	3440	yiivdk.exe	86

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:

yiivdk.exeyiivdk.exeyiivdk.exeyiivdk.exeyiivdk.exe

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

Suspicious behavior: EnumeratesProcesses 7 IoCs

Processes:

yiivdk.exeyiivdk.exeyiivdk.exe

pid	Process
2100	yiivdk.exe
3992	yiivdk.exe
3992	yiivdk.exe
5028	yiivdk.exe
5028	yiivdk.exe
3992	yiivdk.exe
3992	yiivdk.exe

Suspicious behavior: MapViewOfSection 4 IoCs

Processes:

yiivdk.exe

pid	Process
3440	yiivdk.exe
3440	yiivdk.exe
3440	yiivdk.exe
3440	yiivdk.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

yiivdk.exeyiivdk.exe

description	pid	Process
Token: SeDebugPrivilege	2100	yiivdk.exe
Token: SeDebugPrivilege	2100	yiivdk.exe
Token: SeDebugPrivilege	5028	yiivdk.exe

Suspicious use of WriteProcessMemory 27 IoCs

Processes:

yiivdk.exeyiivdk.exe

description	pid	Process	procid_target
PID 2100 wrote to memory of 3440	2100	yiivdk.exe	82
PID 2100 wrote to memory of 3440	2100	yiivdk.exe	82
PID 2100 wrote to memory of 3440	2100	yiivdk.exe	82
PID 2100 wrote to memory of 3440	2100	yiivdk.exe	82
PID 2100 wrote to memory of 3440	2100	yiivdk.exe	82
PID 2100 wrote to memory of 3440	2100	yiivdk.exe	82
PID 2100 wrote to memory of 3440	2100	yiivdk.exe	82
PID 2100 wrote to memory of 3440	2100	yiivdk.exe	82
PID 2100 wrote to memory of 3440	2100	yiivdk.exe	82
PID 2100 wrote to memory of 3440	2100	yiivdk.exe	82
PID 2100 wrote to memory of 3440	2100	yiivdk.exe	82
PID 2100 wrote to memory of 3440	2100	yiivdk.exe	82
PID 3440 wrote to memory of 3992	3440	yiivdk.exe	83
PID 3440 wrote to memory of 3992	3440	yiivdk.exe	83
PID 3440 wrote to memory of 3992	3440	yiivdk.exe	83
PID 3440 wrote to memory of 3992	3440	yiivdk.exe	83
PID 3440 wrote to memory of 2744	3440	yiivdk.exe	84
PID 3440 wrote to memory of 2744	3440	yiivdk.exe	84
PID 3440 wrote to memory of 2744	3440	yiivdk.exe	84
PID 3440 wrote to memory of 4776	3440	yiivdk.exe	85
PID 3440 wrote to memory of 4776	3440	yiivdk.exe	85
PID 3440 wrote to memory of 4776	3440	yiivdk.exe	85
PID 3440 wrote to memory of 4776	3440	yiivdk.exe	85
PID 3440 wrote to memory of 5028	3440	yiivdk.exe	86
PID 3440 wrote to memory of 5028	3440	yiivdk.exe	86
PID 3440 wrote to memory of 5028	3440	yiivdk.exe	86
PID 3440 wrote to memory of 5028	3440	yiivdk.exe	86

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3488
- C:\Users\Admin\AppData\Local\Temp\yiivdk.exe
  "C:\Users\Admin\AppData\Local\Temp\yiivdk.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:2100
- C:\Users\Admin\AppData\Local\Temp\yiivdk.exe
  "C:\Users\Admin\AppData\Local\Temp\yiivdk.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:3440
- - C:\Users\Admin\AppData\Local\Temp\yiivdk.exe
    C:\Users\Admin\AppData\Local\Temp\yiivdk.exe /stext "C:\Users\Admin\AppData\Local\Temp\mcgmbnsmcmpplkjifxroiugzesco"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    PID:3992
- - C:\Users\Admin\AppData\Local\Temp\yiivdk.exe
    C:\Users\Admin\AppData\Local\Temp\yiivdk.exe /stext "C:\Users\Admin\AppData\Local\Temp\owmfcgdoquhcvyfmwiehkhaqfymxtxb"
    3⤵
    PID:2744
- - C:\Users\Admin\AppData\Local\Temp\yiivdk.exe
    C:\Users\Admin\AppData\Local\Temp\yiivdk.exe /stext "C:\Users\Admin\AppData\Local\Temp\owmfcgdoquhcvyfmwiehkhaqfymxtxb"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:4776
- - C:\Users\Admin\AppData\Local\Temp\yiivdk.exe
    C:\Users\Admin\AppData\Local\Temp\yiivdk.exe /stext "C:\Users\Admin\AppData\Local\Temp\zzry"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:5028

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

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\mcgmbnsmcmpplkjifxroiugzesco

Filesize
4KB

MD5
7aca43b2800ceb18b3ed2326532545de

SHA1
d4cf207ef85bd749d59c1cb27a09c167ee21523a

SHA256
3d9f8622d97587fd84d3d0560a50ab38e5f894fe4b5bcaa34279643fdaaeb480

SHA512
0e002e6b8d965c227d9b1aa7c0251619c787ec7717e59667e756e5815e3666a955ea397eb148a1ed6bb7d8045727e4efa656a103f14bc70a03b03f0c91283c2f

Download Submit
memory/2100-0-0x000000007515E000-0x000000007515F000-memory.dmp

Filesize
4KB

Download
memory/2100-1-0x00000000004E0000-0x0000000000630000-memory.dmp

Filesize
1.3MB

Download
memory/2100-2-0x0000000005740000-0x0000000005CE4000-memory.dmp

Filesize
5.6MB

Download
memory/2100-3-0x0000000005050000-0x00000000050E2000-memory.dmp

Filesize
584KB

Download
memory/2100-4-0x0000000005040000-0x000000000504A000-memory.dmp

Filesize
40KB

Download
memory/2100-5-0x0000000075150000-0x0000000075900000-memory.dmp

Filesize
7.7MB

Download
memory/2100-6-0x0000000005280000-0x00000000053A4000-memory.dmp

Filesize
1.1MB

Download
memory/2100-7-0x00000000053A0000-0x00000000054C6000-memory.dmp

Filesize
1.1MB

Download
memory/2100-11-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-9-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-15-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-65-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-63-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-71-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-69-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-68-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-61-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-59-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-57-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-56-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-53-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-51-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-47-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-45-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-43-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-41-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-39-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-37-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-35-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-33-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-31-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-23-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-21-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-19-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-17-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-13-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-49-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-29-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-27-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-25-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-1184-0x0000000075150000-0x0000000075900000-memory.dmp

Filesize
7.7MB

Download
memory/2100-8-0x00000000053A0000-0x00000000054BF000-memory.dmp

Filesize
1.1MB

Download
memory/2100-1186-0x00000000056D0000-0x000000000571C000-memory.dmp

Filesize
304KB

Download
memory/2100-1185-0x0000000005DE0000-0x0000000005E76000-memory.dmp

Filesize
600KB

Download
memory/2100-1187-0x0000000005D50000-0x0000000005DA4000-memory.dmp

Filesize
336KB

Download
memory/2100-1194-0x0000000075150000-0x0000000075900000-memory.dmp

Filesize
7.7MB

Download
memory/2100-1203-0x0000000002BA5000-0x0000000002BA6000-memory.dmp

Filesize
4KB

Download
memory/2100-1201-0x0000000075150000-0x0000000075900000-memory.dmp

Filesize
7.7MB

Download
memory/2100-1196-0x0000000075150000-0x0000000075900000-memory.dmp

Filesize
7.7MB

Download
memory/3440-1202-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3440-1230-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3992-1224-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/3992-1227-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/4776-1225-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download