remcos | 77f41b2f785bd720e1461e1a1ab968ffe620d683d448457c22f4620b890732e7

General

Target

springlock.exe
Size

1.3MB
MD5

6cf41ecfa205a9b8e3eca92fe2a0017d
SHA1

d92c17c9045f0ec9557dd896e238737d51d12dab
SHA256

77f41b2f785bd720e1461e1a1ab968ffe620d683d448457c22f4620b890732e7
SHA512

5eebfdc122493d78ea7e3e11798c3ec2aa0eaf57e77d786e1c5740a1fb7ca7d1b4c849ecf105ec0a0b1bd7f539acf8c40f3ef2940c819c481ea32995985509f5
SSDEEP

24576:Ru6J33O0c+JY5UZ+XC0kGso6FaSNvEFhDgSHthSQ98DcjceDvWY:Du0c++OCvkGs9FaSN2Vg+tQXLY

Score

10^/10

remcos remotehost discovery rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

103.83.87.190:5817

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-E1OC2H
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

Drops startup file 1 IoCs

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

Executes dropped EXE 2 IoCs

pid	Process
3328	springlock.exe
4724	springlock.exe

AutoIT Executable 1 IoCs

AutoIT scripts compiled to PE executables.

resource	yara_rule
behavioral1/files/0x000b000000023f44-9.dat	autoit_exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4724 set thread context of 4632	4724	springlock.exe	94

System Location Discovery: System Language Discovery 1 TTPs 4 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	springlock.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	springlock.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	springlock.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
3328	springlock.exe
4724	springlock.exe

Suspicious use of FindShellTrayWindow 7 IoCs

pid	Process
1932	springlock.exe
1932	springlock.exe
3328	springlock.exe
3328	springlock.exe
4724	springlock.exe
4724	springlock.exe
4632	svchost.exe

Suspicious use of SendNotifyMessage 7 IoCs

pid	Process
1932	springlock.exe
1932	springlock.exe
3328	springlock.exe
3328	springlock.exe
4724	springlock.exe
4724	springlock.exe
4632	svchost.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 1932 wrote to memory of 3328	1932	springlock.exe	90
PID 1932 wrote to memory of 3328	1932	springlock.exe	90
PID 1932 wrote to memory of 3328	1932	springlock.exe	90
PID 3328 wrote to memory of 1060	3328	springlock.exe	91
PID 3328 wrote to memory of 1060	3328	springlock.exe	91
PID 3328 wrote to memory of 1060	3328	springlock.exe	91
PID 3328 wrote to memory of 4724	3328	springlock.exe	92
PID 3328 wrote to memory of 4724	3328	springlock.exe	92
PID 3328 wrote to memory of 4724	3328	springlock.exe	92
PID 4724 wrote to memory of 4632	4724	springlock.exe	94
PID 4724 wrote to memory of 4632	4724	springlock.exe	94
PID 4724 wrote to memory of 4632	4724	springlock.exe	94
PID 4724 wrote to memory of 4632	4724	springlock.exe	94

C:\Users\Admin\AppData\Local\Temp\springlock.exe
"C:\Users\Admin\AppData\Local\Temp\springlock.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1932
- C:\Users\Admin\AppData\Local\avenses\springlock.exe
  "C:\Users\Admin\AppData\Local\Temp\springlock.exe"
  2⤵
  - Drops startup file
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:3328
- - C:\Windows\SysWOW64\svchost.exe
    "C:\Users\Admin\AppData\Local\Temp\springlock.exe"
    3⤵
    PID:1060
- - C:\Users\Admin\AppData\Local\avenses\springlock.exe
    "C:\Users\Admin\AppData\Local\avenses\springlock.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:4724
  - - C:\Windows\SysWOW64\svchost.exe
      "C:\Users\Admin\AppData\Local\avenses\springlock.exe"
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of FindShellTrayWindow
      Suspicious use of SendNotifyMessage
      PID:4632

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
486KB

MD5
c2869f73f85d715578376e410b2833e3

SHA1
ecd1376418f55ce9feb275f53ff13b61077ffea2

SHA256
f9dc4d0de0949234d1ec4dfdda9685072e957d687d069d6d837c4ef05b981786

SHA512
31047ab71658ff3e3a403c44a08fc3e1fe1c097608d997b69946bfeacfdb4c7aa409a434aeda480858ec35d1d2bd7c63165908b0e727fc602486ac0c0d13f9ac

Download Submit
C:\Users\Admin\AppData\Local\Temp\aut7B0C.tmp

Filesize
403KB

MD5
03df6b13e7867c002ecd6fd65d99d5e6

SHA1
fb8ecb53b40d9b678ccee40fc5bae0fe7605c487

SHA256
e57a02ecb5b1393388aba52392af9d6fbcecdb92c4e70b4f6d8f9ff42da1d2ac

SHA512
b84c72400c626975a0d3352d0bc8b0776cf8f11465945c64b36df2978e3556eb151dab0042c597274999efc435a0b9ca82963a8d1de71e235aa9a64d51c72692

Download Submit
C:\Users\Admin\AppData\Local\avenses\springlock.exe

Filesize
1.3MB

MD5
6cf41ecfa205a9b8e3eca92fe2a0017d

SHA1
d92c17c9045f0ec9557dd896e238737d51d12dab

SHA256
77f41b2f785bd720e1461e1a1ab968ffe620d683d448457c22f4620b890732e7

SHA512
5eebfdc122493d78ea7e3e11798c3ec2aa0eaf57e77d786e1c5740a1fb7ca7d1b4c849ecf105ec0a0b1bd7f539acf8c40f3ef2940c819c481ea32995985509f5

Download Submit
memory/1932-6-0x0000000001390000-0x0000000001790000-memory.dmp

Filesize
4.0MB

Download
memory/3328-18-0x0000000000EC0000-0x00000000012C0000-memory.dmp

Filesize
4.0MB

Download
memory/4632-40-0x0000000000400000-0x0000000000481000-memory.dmp

Filesize
516KB

Download
memory/4632-39-0x0000000000400000-0x0000000000481000-memory.dmp

Filesize
516KB

Download
memory/4632-30-0x0000000000400000-0x0000000000481000-memory.dmp

Filesize
516KB

Download
memory/4632-31-0x0000000000400000-0x0000000000481000-memory.dmp

Filesize
516KB

Download
memory/4632-32-0x0000000000400000-0x0000000000481000-memory.dmp

Filesize
516KB

Download
memory/4632-33-0x0000000000400000-0x0000000000481000-memory.dmp

Filesize
516KB

Download
memory/4632-34-0x0000000000400000-0x0000000000481000-memory.dmp

Filesize
516KB

Download
memory/4632-35-0x0000000000400000-0x0000000000481000-memory.dmp

Filesize
516KB

Download
memory/4632-36-0x0000000000400000-0x0000000000481000-memory.dmp

Filesize
516KB

Download
memory/4632-37-0x0000000000400000-0x0000000000481000-memory.dmp

Filesize
516KB

Download
memory/4632-38-0x0000000000400000-0x0000000000481000-memory.dmp

Filesize
516KB

Download
memory/4632-29-0x0000000000400000-0x0000000000481000-memory.dmp

Filesize
516KB

Download
memory/4632-48-0x0000000000400000-0x0000000000481000-memory.dmp

Filesize
516KB

Download
memory/4632-41-0x0000000000400000-0x0000000000481000-memory.dmp

Filesize
516KB

Download
memory/4632-42-0x0000000000400000-0x0000000000481000-memory.dmp

Filesize
516KB

Download
memory/4632-43-0x0000000000400000-0x0000000000481000-memory.dmp

Filesize
516KB

Download
memory/4632-44-0x0000000000400000-0x0000000000481000-memory.dmp

Filesize
516KB

Download
memory/4632-45-0x0000000000400000-0x0000000000481000-memory.dmp

Filesize
516KB

Download
memory/4632-46-0x0000000000400000-0x0000000000481000-memory.dmp

Filesize
516KB

Download
memory/4632-47-0x0000000000400000-0x0000000000481000-memory.dmp

Filesize
516KB

Download
memory/4724-28-0x00000000012E0000-0x00000000016E0000-memory.dmp

Filesize
4.0MB

Download

Analysis

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