remcos | c889443786dc57c284a40fd1a9764bad2f026a8c20e191059707d1646ff931e0

Analysis

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

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
10-01-2025 14:40

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General

Target

c889443786dc57c284a40fd1a9764bad2f026a8c20e191059707d1646ff931e0.exe
Size

900KB
MD5

be20dfffcba37064d6087aa714036873
SHA1

4f50f7f954ed27b8e3373a5d900905d98d1bb51e
SHA256

c889443786dc57c284a40fd1a9764bad2f026a8c20e191059707d1646ff931e0
SHA512

955a14d104edf528cd3d1f140181e6222cc1f88c8f1fb0a6a60fa0d37962b34c535a29e45ba029cf8daa039df06d25b26689feb600fb8b499fe46de0b3bf4696
SSDEEP

24576:0rl6kD68JmlotQf1nQr8zKS7ifTcvt2S3Sc1YNTN:Cl328U2yfuo2hfwvtJCxT

Score

10^/10

remcos remotehost collection discovery rat spyware stealer upx

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

192.210.150.26:3678

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
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-MKYDDH
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 4 IoCs

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

resource	yara_rule
behavioral2/memory/2032-79-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/2440-83-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/2784-71-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/2784-85-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

NirSoft MailPassView 1 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/2032-79-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 2 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/2784-71-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/2784-85-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Drops startup file 1 IoCs

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

Executes dropped EXE 6 IoCs

pid	Process
3808	Milburr.exe
2628	Milburr.exe
2784	Milburr.exe
2252	Milburr.exe
2032	Milburr.exe
2440	Milburr.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-1-5-21-3756129449-3121373848-4276368241-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	Milburr.exe

AutoIT Executable 3 IoCs

AutoIT scripts compiled to PE executables.

resource	yara_rule
behavioral2/memory/1916-18-0x0000000000F40000-0x000000000112E000-memory.dmp	autoit_exe
behavioral2/memory/3808-37-0x0000000000D00000-0x0000000000EEE000-memory.dmp	autoit_exe
behavioral2/memory/2628-94-0x0000000000D00000-0x0000000000EEE000-memory.dmp	autoit_exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2628 set thread context of 2784	2628	Milburr.exe	84
PID 2628 set thread context of 2032	2628	Milburr.exe	86
PID 2628 set thread context of 2440	2628	Milburr.exe	87

UPX packed file 7 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/1916-0-0x0000000000F40000-0x000000000112E000-memory.dmp	upx
behavioral2/files/0x000a000000023b51-15.dat	upx
behavioral2/memory/1916-18-0x0000000000F40000-0x000000000112E000-memory.dmp	upx
behavioral2/memory/3808-16-0x0000000000D00000-0x0000000000EEE000-memory.dmp	upx
behavioral2/memory/2628-38-0x0000000000D00000-0x0000000000EEE000-memory.dmp	upx
behavioral2/memory/3808-37-0x0000000000D00000-0x0000000000EEE000-memory.dmp	upx
behavioral2/memory/2628-94-0x0000000000D00000-0x0000000000EEE000-memory.dmp	upx

System Location Discovery: System Language Discovery 1 TTPs 6 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	c889443786dc57c284a40fd1a9764bad2f026a8c20e191059707d1646ff931e0.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Milburr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Milburr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Milburr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Milburr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Milburr.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2784	Milburr.exe
2784	Milburr.exe
2440	Milburr.exe
2440	Milburr.exe
2784	Milburr.exe
2784	Milburr.exe

Suspicious behavior: MapViewOfSection 4 IoCs

pid	Process
2628	Milburr.exe
2628	Milburr.exe
2628	Milburr.exe
2628	Milburr.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2440	Milburr.exe

Suspicious use of FindShellTrayWindow 6 IoCs

pid	Process
1916	c889443786dc57c284a40fd1a9764bad2f026a8c20e191059707d1646ff931e0.exe
1916	c889443786dc57c284a40fd1a9764bad2f026a8c20e191059707d1646ff931e0.exe
3808	Milburr.exe
3808	Milburr.exe
2628	Milburr.exe
2628	Milburr.exe

Suspicious use of SendNotifyMessage 6 IoCs

pid	Process
1916	c889443786dc57c284a40fd1a9764bad2f026a8c20e191059707d1646ff931e0.exe
1916	c889443786dc57c284a40fd1a9764bad2f026a8c20e191059707d1646ff931e0.exe
3808	Milburr.exe
3808	Milburr.exe
2628	Milburr.exe
2628	Milburr.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 1916 wrote to memory of 3808	1916	c889443786dc57c284a40fd1a9764bad2f026a8c20e191059707d1646ff931e0.exe	82
PID 1916 wrote to memory of 3808	1916	c889443786dc57c284a40fd1a9764bad2f026a8c20e191059707d1646ff931e0.exe	82
PID 1916 wrote to memory of 3808	1916	c889443786dc57c284a40fd1a9764bad2f026a8c20e191059707d1646ff931e0.exe	82
PID 3808 wrote to memory of 2628	3808	Milburr.exe	83
PID 3808 wrote to memory of 2628	3808	Milburr.exe	83
PID 3808 wrote to memory of 2628	3808	Milburr.exe	83
PID 2628 wrote to memory of 2784	2628	Milburr.exe	84
PID 2628 wrote to memory of 2784	2628	Milburr.exe	84
PID 2628 wrote to memory of 2784	2628	Milburr.exe	84
PID 2628 wrote to memory of 2784	2628	Milburr.exe	84
PID 2628 wrote to memory of 2252	2628	Milburr.exe	85
PID 2628 wrote to memory of 2252	2628	Milburr.exe	85
PID 2628 wrote to memory of 2252	2628	Milburr.exe	85
PID 2628 wrote to memory of 2032	2628	Milburr.exe	86
PID 2628 wrote to memory of 2032	2628	Milburr.exe	86
PID 2628 wrote to memory of 2032	2628	Milburr.exe	86
PID 2628 wrote to memory of 2032	2628	Milburr.exe	86
PID 2628 wrote to memory of 2440	2628	Milburr.exe	87
PID 2628 wrote to memory of 2440	2628	Milburr.exe	87
PID 2628 wrote to memory of 2440	2628	Milburr.exe	87
PID 2628 wrote to memory of 2440	2628	Milburr.exe	87

C:\Users\Admin\AppData\Local\Temp\c889443786dc57c284a40fd1a9764bad2f026a8c20e191059707d1646ff931e0.exe
"C:\Users\Admin\AppData\Local\Temp\c889443786dc57c284a40fd1a9764bad2f026a8c20e191059707d1646ff931e0.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1916
- C:\Users\Admin\AppData\Local\obtenebrate\Milburr.exe
  "C:\Users\Admin\AppData\Local\Temp\c889443786dc57c284a40fd1a9764bad2f026a8c20e191059707d1646ff931e0.exe"
  2⤵
  - Drops startup file
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:3808
- - C:\Users\Admin\AppData\Local\obtenebrate\Milburr.exe
    "C:\Users\Admin\AppData\Local\obtenebrate\Milburr.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of FindShellTrayWindow
    - Suspicious use of SendNotifyMessage
    - Suspicious use of WriteProcessMemory
    PID:2628
  - - C:\Users\Admin\AppData\Local\obtenebrate\Milburr.exe
      C:\Users\Admin\AppData\Local\obtenebrate\Milburr.exe /stext "C:\Users\Admin\AppData\Local\Temp\scivjxhszcvkw"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      PID:2784
  - - C:\Users\Admin\AppData\Local\obtenebrate\Milburr.exe
      C:\Users\Admin\AppData\Local\obtenebrate\Milburr.exe /stext "C:\Users\Admin\AppData\Local\Temp\dwnnkqsunknphvgbo"
      4⤵
      Executes dropped EXE
      PID:2252
  - - C:\Users\Admin\AppData\Local\obtenebrate\Milburr.exe
      C:\Users\Admin\AppData\Local\obtenebrate\Milburr.exe /stext "C:\Users\Admin\AppData\Local\Temp\dwnnkqsunknphvgbo"
      4⤵
      Executes dropped EXE
      Accesses Microsoft Outlook accounts
      System Location Discovery: System Language Discovery
      PID:2032
  - - C:\Users\Admin\AppData\Local\obtenebrate\Milburr.exe
      C:\Users\Admin\AppData\Local\obtenebrate\Milburr.exe /stext "C:\Users\Admin\AppData\Local\Temp\fysglicnbsfcjjcnyhss"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2440

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:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
10fe13f4d0c406593eb70c2ab1ce8353

SHA1
e0f66a170698045abef7bd3b092d7f075477b4e5

SHA256
c4573dac781bd536616b7c8c3fe8b76972afb0f9f9f309f1493366dffd6c8dcf

SHA512
15e79bfd238bfb6d2bc270b5f36abb9d82102a4888b83056ee51993dbf0887d100e8e77f48814d921a3b15f5fdc2237acd92094bcea4abc807bc4518d5f54da8

Download Submit
C:\Users\Admin\AppData\Local\Temp\Charley

Filesize
481KB

MD5
e8f92d99524eff3de429c3718b7a1491

SHA1
b0c6f6a240841e77e7d20f99b379a9c6ee35d85b

SHA256
894cb71ad99ff88b5c93218788de1d133b4d0404d4996f7e5d3255209322f6e9

SHA512
4cf796747db21c4eb2cda23fb79e184c49b62b2e84e15b669a0025224991e4f9e0e261c6e03a12dd8b5e6b105d2aa7e8e652aa3f4863cec73a88bc02906c17d6

Download Submit
C:\Users\Admin\AppData\Local\Temp\aut8712.tmp

Filesize
404KB

MD5
df6ce24c1d936b4b56dcd548def18b8d

SHA1
bb8cca79e83c81605fe2b2ffcfb657612fd798a1

SHA256
fed7b359f763f28d9e01bb5f6c734a29f17a67ae34161f4053ddac0407f52610

SHA512
7aea698b0a2c06812fbe00d0315af7ba18c15ae572c2ef7088db28ce3a5b6ab122ce4e711e8fe20d7763a47e8591afb248a02b55d5059f49f06b3201918648e8

Download Submit
C:\Users\Admin\AppData\Local\Temp\aut8723.tmp

Filesize
14KB

MD5
00360588750369bc243ed68948507859

SHA1
861af2e9e7e94f3fbabb95259d86f2a93c4eddb3

SHA256
71e5d5e454b65c35189f3cc57c5923678f53758420abf6c3975a0e188fb8d855

SHA512
c8b360b472a1e0cb8957afce1ec644d465eb087b28328d7b3d3c88b3c2870ca885d42d66c9cfaeae2347d02a87e47da645a92f16c6140ceb036df147f91d51df

Download Submit
C:\Users\Admin\AppData\Local\Temp\scivjxhszcvkw

Filesize
4KB

MD5
bc25ccf39db8626dc249529bcc8c5639

SHA1
3e9cbdb20a0970a3c13719a2f289d210cdcc9e1d

SHA256
b333f8c736c701bc826886f395d928731850cbce6db77be752b3cf7979114904

SHA512
9a546127bddc1d187e674cda82e6c5046cac7f3e6f9515aed68d5bff2264b9d679d857dd97270e10826cd11ce2d92d82dd7f9801e19027e346b60bcc814cca1a

Download Submit
C:\Users\Admin\AppData\Local\Temp\teer

Filesize
140KB

MD5
b98ee815fe928b457a8ca6290ca38293

SHA1
b2a6929d5a5b461ad3aa6a8ed873f2e5fc106fd5

SHA256
d1de55cc4b804a902cd9ecbc8c4658586a9b85d4a26f147e49ca17406ebe5c6b

SHA512
2964c872a41ddac596490be2c9b4797ee97294503d509ea8e6b8fc8d43336bf2896189af88c8a225bb3e59f4127bc7cb81b9c05ed927b813aeb04de4f80af5bb

Download Submit
C:\Users\Admin\AppData\Local\obtenebrate\Milburr.exe

Filesize
900KB

MD5
be20dfffcba37064d6087aa714036873

SHA1
4f50f7f954ed27b8e3373a5d900905d98d1bb51e

SHA256
c889443786dc57c284a40fd1a9764bad2f026a8c20e191059707d1646ff931e0

SHA512
955a14d104edf528cd3d1f140181e6222cc1f88c8f1fb0a6a60fa0d37962b34c535a29e45ba029cf8daa039df06d25b26689feb600fb8b499fe46de0b3bf4696

Download Submit
memory/1916-18-0x0000000000F40000-0x000000000112E000-memory.dmp

Filesize
1.9MB

Download
memory/1916-12-0x0000000001320000-0x0000000001720000-memory.dmp

Filesize
4.0MB

Download
memory/1916-0-0x0000000000F40000-0x000000000112E000-memory.dmp

Filesize
1.9MB

Download
memory/2032-75-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/2032-73-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/2032-79-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/2440-80-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/2440-82-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/2440-83-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/2628-56-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2628-91-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/2628-61-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2628-60-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2628-62-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2628-64-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2628-65-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2628-148-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2628-147-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2628-57-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2628-58-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2628-53-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2628-52-0x0000000001010000-0x0000000001410000-memory.dmp

Filesize
4.0MB

Download
memory/2628-137-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2628-38-0x0000000000D00000-0x0000000000EEE000-memory.dmp

Filesize
1.9MB

Download
memory/2628-136-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2628-126-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2628-125-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2628-114-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2628-59-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2628-90-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/2628-87-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/2628-92-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2628-103-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2628-94-0x0000000000D00000-0x0000000000EEE000-memory.dmp

Filesize
1.9MB

Download
memory/2628-95-0x0000000001010000-0x0000000001410000-memory.dmp

Filesize
4.0MB

Download
memory/2628-97-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2628-104-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2784-85-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2784-69-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2784-71-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2784-70-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2784-66-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/3808-93-0x0000000000F50000-0x0000000001350000-memory.dmp

Filesize
4.0MB

Download
memory/3808-16-0x0000000000D00000-0x0000000000EEE000-memory.dmp

Filesize
1.9MB

Download
memory/3808-33-0x0000000000F50000-0x0000000001350000-memory.dmp

Filesize
4.0MB

Download
memory/3808-37-0x0000000000D00000-0x0000000000EEE000-memory.dmp

Filesize
1.9MB

Download