remcos | 3d4a19ec73693a6e2b0618872193fee163a9fde348cb677c6e05316b71945d88

General

Target

QUOTATION LIST.PDF.js
Size

862KB
MD5

30cc031f7f3c29317acf50899c92502f
SHA1

360680549dbbbc586cbaaacfe39ce5ae064014e3
SHA256

3d4a19ec73693a6e2b0618872193fee163a9fde348cb677c6e05316b71945d88
SHA512

6d12bcfe97136feba36013d9726544ff473d61e056b2bd9175415136eab74885303068c55ccecdf9d227a1e01d74b12de96fbe24a3f4b69f89e692d3b0f723f9
SSDEEP

12288:Xh92LGDRefFwHUbzDGd/a/b0kvmsJ148G+6J7ou/QpFDLfzGWNGZ1h4DjOmzt05K:Xh9/FEv/3vJsgqo

Score

10^/10

remcos vjw0rm remotehost persistence rat trojan worm

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

45.139.105.174:3111

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
true
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-XI5CH7
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
Vjw0rm
Vjw0rm is a remote access trojan written in JavaScript.
trojan worm vjw0rm
Blocklisted process makes network request 6 IoCs

Processes:

wscript.exe

flow pid process

4 4944 wscript.exe
16 4944 wscript.exe
30 4944 wscript.exe
40 4944 wscript.exe
50 4944 wscript.exe
66 4944 wscript.exe
Executes dropped EXE 2 IoCs

Processes:

BBL.exeremcos.exe

pid process

5080 BBL.exe
3680 remcos.exe

flow	pid	process
4	4944	wscript.exe
16	4944	wscript.exe
30	4944	wscript.exe
40	4944	wscript.exe
50	4944	wscript.exe
66	4944	wscript.exe

pid	process
5080	BBL.exe
3680	remcos.exe

Checks computer location settings 2 TTPs 3 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

wscript.exeBBL.exeWScript.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	wscript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	BBL.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	WScript.exe

Drops startup file 2 IoCs

Processes:

wscript.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\KYQCJFgzrF.js	wscript.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\KYQCJFgzrF.js	wscript.exe

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

remcos.exeBBL.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	remcos.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\	remcos.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	remcos.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Windows\CurrentVersion\Run\	BBL.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	BBL.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\	BBL.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	BBL.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Windows\CurrentVersion\Run\	remcos.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

remcos.exe

description pid process target process

PID 3680 set thread context of 852 3680 remcos.exe iexplore.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Modifies registry class 1 IoCs

Processes:

BBL.exe

description ioc process

Key created \REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000_Classes\Local Settings BBL.exe
Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

remcos.exe

pid process

3680 remcos.exe

description	pid	process	target process
PID 3680 set thread context of 852	3680	remcos.exe	iexplore.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000_Classes\Local Settings	BBL.exe

pid	process
3680	remcos.exe

Suspicious use of WriteProcessMemory 18 IoCs

Processes:

wscript.exeBBL.exeWScript.execmd.exeremcos.exe

description	pid	process	target process
PID 2652 wrote to memory of 4944	2652	wscript.exe	wscript.exe
PID 2652 wrote to memory of 4944	2652	wscript.exe	wscript.exe
PID 2652 wrote to memory of 5080	2652	wscript.exe	BBL.exe
PID 2652 wrote to memory of 5080	2652	wscript.exe	BBL.exe
PID 2652 wrote to memory of 5080	2652	wscript.exe	BBL.exe
PID 5080 wrote to memory of 4804	5080	BBL.exe	WScript.exe
PID 5080 wrote to memory of 4804	5080	BBL.exe	WScript.exe
PID 5080 wrote to memory of 4804	5080	BBL.exe	WScript.exe
PID 4804 wrote to memory of 4832	4804	WScript.exe	cmd.exe
PID 4804 wrote to memory of 4832	4804	WScript.exe	cmd.exe
PID 4804 wrote to memory of 4832	4804	WScript.exe	cmd.exe
PID 4832 wrote to memory of 3680	4832	cmd.exe	remcos.exe
PID 4832 wrote to memory of 3680	4832	cmd.exe	remcos.exe
PID 4832 wrote to memory of 3680	4832	cmd.exe	remcos.exe
PID 3680 wrote to memory of 852	3680	remcos.exe	iexplore.exe
PID 3680 wrote to memory of 852	3680	remcos.exe	iexplore.exe
PID 3680 wrote to memory of 852	3680	remcos.exe	iexplore.exe
PID 3680 wrote to memory of 852	3680	remcos.exe	iexplore.exe

C:\Windows\system32\wscript.exe
wscript.exe "C:\Users\Admin\AppData\Local\Temp\QUOTATION LIST.PDF.js"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2652

C:\Windows\System32\wscript.exe
"C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\KYQCJFgzrF.js"
2⤵
- Blocklisted process makes network request
- Drops startup file
PID:4944

C:\Users\Admin\AppData\Roaming\BBL.exe
"C:\Users\Admin\AppData\Roaming\BBL.exe"
2⤵
- Executes dropped EXE
- Checks computer location settings
- Adds Run key to start application
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:5080

C:\Windows\SysWOW64\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\qekpxtpneaidqhqnensfauhujmshitgt.vbs"
3⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4804

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c "C:\ProgramData\Remcos\remcos.exe"
4⤵
- Suspicious use of WriteProcessMemory
PID:4832

C:\ProgramData\Remcos\remcos.exe
C:\ProgramData\Remcos\remcos.exe
5⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:3680

\??\c:\program files (x86)\internet explorer\iexplore.exe
"c:\program files (x86)\internet explorer\iexplore.exe"
6⤵
PID:852

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\ProgramData\Remcos\remcos.exe
Filesize
470KB

MD5
8f6f561ec65b393126f5b648f890e78a

SHA1
cea6ff88ba56fcfdcf5992b5b35ec2accbd234a3

SHA256
8acb8ff6a5565f9d8b56e2712858db04e577c53906c8045fa43bdf1e7669120a

SHA512
58e2544db5c4a9771d3cfef8364e80f4b0fb954f7ace2585fbb619d5b9de641eaac6956127d61d5808874633033d3c6d4322fb250a47a7dce5a3c8f2e7f8b27b

Download Submit
C:\ProgramData\Remcos\remcos.exe
Filesize
470KB

MD5
8f6f561ec65b393126f5b648f890e78a

SHA1
cea6ff88ba56fcfdcf5992b5b35ec2accbd234a3

SHA256
8acb8ff6a5565f9d8b56e2712858db04e577c53906c8045fa43bdf1e7669120a

SHA512
58e2544db5c4a9771d3cfef8364e80f4b0fb954f7ace2585fbb619d5b9de641eaac6956127d61d5808874633033d3c6d4322fb250a47a7dce5a3c8f2e7f8b27b

Download Submit
C:\Users\Admin\AppData\Local\Temp\qekpxtpneaidqhqnensfauhujmshitgt.vbs
Filesize
386B

MD5
1ec6289c6fd4c2ded6b2836ed28cbeb5

SHA1
c4e08195e6c640eb8860acc03fda1d649b4fe070

SHA256
6efdc40f9eb217f879607614e928b65bff759e424f3efb31faceb2a043c32dc2

SHA512
20bc46f4dee22f75f15c402c7c2eaee60fff7dd92548050585571dcbefd59485cc249c06bc3f1aac7a138e5ae67c0c3918b46ffa24c8b0f1b092e2f6b6e21288

Download Submit
C:\Users\Admin\AppData\Roaming\BBL.exe
Filesize
470KB

MD5
8f6f561ec65b393126f5b648f890e78a

SHA1
cea6ff88ba56fcfdcf5992b5b35ec2accbd234a3

SHA256
8acb8ff6a5565f9d8b56e2712858db04e577c53906c8045fa43bdf1e7669120a

SHA512
58e2544db5c4a9771d3cfef8364e80f4b0fb954f7ace2585fbb619d5b9de641eaac6956127d61d5808874633033d3c6d4322fb250a47a7dce5a3c8f2e7f8b27b

Download Submit
C:\Users\Admin\AppData\Roaming\BBL.exe
Filesize
470KB

MD5
8f6f561ec65b393126f5b648f890e78a

SHA1
cea6ff88ba56fcfdcf5992b5b35ec2accbd234a3

SHA256
8acb8ff6a5565f9d8b56e2712858db04e577c53906c8045fa43bdf1e7669120a

SHA512
58e2544db5c4a9771d3cfef8364e80f4b0fb954f7ace2585fbb619d5b9de641eaac6956127d61d5808874633033d3c6d4322fb250a47a7dce5a3c8f2e7f8b27b

Download Submit
C:\Users\Admin\AppData\Roaming\KYQCJFgzrF.js
Filesize
6KB

MD5
fb1d05fde935d94d87312e535a572968

SHA1
6de5675cf2fa5ea97985fec1003bbb50cca157ff

SHA256
1ef89af5ef90dd1914711c789fa14525a421c63072d8dccee70a0db158c1c496

SHA512
ea48ee77a8abed386091c2309f75c7edf8fa5810b502ee456ac471ece5c091a2aa7bd69853b5f0b2b9f1a158c06c46441bc87acbda7662b77d653b35726250bc

Download Submit
memory/852-143-0x0000000000000000-mapping.dmp

Download
memory/852-144-0x0000000000F00000-0x0000000000F7F000-memory.dmp

Filesize
508KB

Download
memory/852-145-0x0000000000F00000-0x0000000000F7F000-memory.dmp

Filesize
508KB

Download
memory/3680-140-0x0000000000000000-mapping.dmp

Download
memory/4804-137-0x0000000000000000-mapping.dmp

Download
memory/4832-139-0x0000000000000000-mapping.dmp

Download
memory/4944-132-0x0000000000000000-mapping.dmp

Download
memory/5080-134-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads