remcos | 52e5414e2e8aabecfc1c38926a3d863e1ee26bef5dc8453fc0568d9f263cf384

General

Target

csrss.exe
Size

1.2MB
MD5

354b34a3694e2b4d54ba3bca624aa3c3
SHA1

660ee183f7f7a17eace0556c8883a2c361424cb0
SHA256

52e5414e2e8aabecfc1c38926a3d863e1ee26bef5dc8453fc0568d9f263cf384
SHA512

f78bbbd45ee9dc147394f79c0aed2c8104c42116b72c653586ac0855d0c075e3b17571bc62e33ba055bcc91197f6e2a491e97ad35eab8f425bbf713a5e0b5870
SSDEEP

24576:+tb20pkaCqT5TBWgNQ7aLHWD2rmiOWlcIqDBZLAkxy06A:rVg5tQ7aLHWDd/B9A65

Score

10^/10

remcos remotehost discovery rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

spacesave.duckdns.org:14645

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-RLABK3
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

Drops startup file 1 IoCs

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

Executes dropped EXE 2 IoCs

pid	Process
4828	dddddd.exe
888	dddddd.exe

AutoIT Executable 1 IoCs

AutoIT scripts compiled to PE executables.

resource	yara_rule
behavioral2/files/0x0002000000022a8b-14.dat	autoit_exe

System Location Discovery: System Language Discovery 1 TTPs 3 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	csrss.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	dddddd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	dddddd.exe

Suspicious use of FindShellTrayWindow 6 IoCs

pid	Process
4876	csrss.exe
4876	csrss.exe
4828	dddddd.exe
4828	dddddd.exe
888	dddddd.exe
888	dddddd.exe

Suspicious use of SendNotifyMessage 6 IoCs

pid	Process
4876	csrss.exe
4876	csrss.exe
4828	dddddd.exe
4828	dddddd.exe
888	dddddd.exe
888	dddddd.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4876 wrote to memory of 4828	4876	csrss.exe	87
PID 4876 wrote to memory of 4828	4876	csrss.exe	87
PID 4876 wrote to memory of 4828	4876	csrss.exe	87
PID 4828 wrote to memory of 888	4828	dddddd.exe	88
PID 4828 wrote to memory of 888	4828	dddddd.exe	88
PID 4828 wrote to memory of 888	4828	dddddd.exe	88

C:\Users\Admin\AppData\Local\Temp\csrss.exe
"C:\Users\Admin\AppData\Local\Temp\csrss.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:4876
- C:\Users\Admin\AppData\Local\directory\dddddd.exe
  "C:\Users\Admin\AppData\Local\Temp\csrss.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:4828
- - C:\Users\Admin\AppData\Local\directory\dddddd.exe
    "C:\Users\Admin\AppData\Local\directory\dddddd.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of FindShellTrayWindow
    - Suspicious use of SendNotifyMessage
    PID:888

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\aut7A7F.tmp

Filesize
384KB

MD5
4a528c9e55817786057cd2ab4271dac0

SHA1
2c0b82cb50af76330de89b69164b9a32f59ea5d8

SHA256
02ef6f365d2d9e4ab97c80fe70d89f7b51cc5914a6756b17e1d372b40af25b44

SHA512
5e672a53bb82b881d3ad1c492a93096589e8a9c2ed920be5d1e5ef93453baded47db96be55b74a84547edcf33d95b0ae1b1c2aed5d2d103e26481960545c517c

Download Submit
C:\Users\Admin\AppData\Local\Temp\aut7A90.tmp

Filesize
10KB

MD5
794dd42e43c9f5f2a14a526c2c78e768

SHA1
4e31258ac80b9ecbdd8e9001c07378f2868b8350

SHA256
8927cfafaefe0cc666afbeefcb0c4558e67df5e184f30f6a6420bcfdafd6229d

SHA512
642254b6c1b3d414a239a431cff2910f8707d638aca5d7af03ad5fe655766b18cbf1e8f94f0593b9ffe3de17a4205e5762a2b244a336f91d30e4c0e6ea3d5c05

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

Filesize
56KB

MD5
be57919a8e6f5c3d638c08144dfff614

SHA1
a096881aaea02eecc45536e041050cf08917b433

SHA256
88b06124dd503e93614f8dc3fd011565c949e2a36ecb44c0a9de685465330167

SHA512
8c6154154f3ee2ed6d19b6527f89ae3279fc64b0489baf415b1779cbe2af12d4f4cac2fd67e2c57a825639f86e8b4a72ca2ead831fe93bc90141a013bb4bbcf5

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

Filesize
64KB

MD5
747e94021b02202d57f46e4edfbd3455

SHA1
98e854546b0344e046448024966d4535fc3d5108

SHA256
8e1f959a3bc17073e652a047f71e1b47bb75383dcaa7d7bb2dab2b0be1079422

SHA512
c51b7ef5c69984221b302accfce5f5927485fe9d68397d0aea7e7afc04ed9d9c1abb9611150390f42ba618d04ae38179da80a681e2041a64b03053a7828cedd3

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

Filesize
483KB

MD5
f4461a02e25109973cdf62c9260edc73

SHA1
988eaf6cf392bc92f09c514a99db3b44bd9d0450

SHA256
35317bf8ab08c12751490059e9af81b8226b013401e9906ad109e49c1924d13f

SHA512
f6d86a3f8702d89acc1c4cb63fbd81d03a8f86d8f43ce1a244343b59b6121416420c421e10830675dd970d97064ab2b7b422b60fe2658b263daf12f2932707dc

Download Submit
C:\Users\Admin\AppData\Local\directory\dddddd.exe

Filesize
1.2MB

MD5
354b34a3694e2b4d54ba3bca624aa3c3

SHA1
660ee183f7f7a17eace0556c8883a2c361424cb0

SHA256
52e5414e2e8aabecfc1c38926a3d863e1ee26bef5dc8453fc0568d9f263cf384

SHA512
f78bbbd45ee9dc147394f79c0aed2c8104c42116b72c653586ac0855d0c075e3b17571bc62e33ba055bcc91197f6e2a491e97ad35eab8f425bbf713a5e0b5870

Download Submit
memory/888-47-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/888-53-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/888-45-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/888-46-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/888-60-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/888-48-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/888-49-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/888-50-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/888-52-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/888-44-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/888-54-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/888-55-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/888-56-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/888-57-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/888-58-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/888-59-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/4876-11-0x0000000003DD0000-0x0000000003DD4000-memory.dmp

Filesize
16KB

Download

Analysis

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