remcos | 8038ff6a41673eb151cdb7f03872c741dc762834c856d70030cd54af744e36a4

General

Target

advancePayment-pdf.exe
Size

537KB
MD5

821cd5ef8d94deeeee5b7cb82379c212
SHA1

977f8407a7033b20b96fec686e918c177160ae92
SHA256

8038ff6a41673eb151cdb7f03872c741dc762834c856d70030cd54af744e36a4
SHA512

0f4f856cf1cc965a5be602503eb3f26cee460c5b2ce709ed2f7672973da801a4cc9bd7a67f9b2ffe7471421b67d44a51c302ff98bd065febbf1d73ebe54a9881
SSDEEP

12288:kEaf/xmwKOsmya7IQVPl55z0AdmSg4MXu3KYPH:kEafZ7HyaEQVFz0AdmSg4ku3KYP

Score

10^/10

remcos yavakosa discovery persistence rat

Malware Config

Extracted

Family

remcos

Botnet

Yavakosa

C2

198.23.227.212:32583

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
yavascript.exe
copy_folder
xenor
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
true
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-I7G983
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

Executes dropped EXE 1 IoCs

pid	Process
2780	yavascript.exe

Loads dropped DLL 2 IoCs

pid	Process
564	advancePayment-pdf.exe
564	advancePayment-pdf.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\Rmc-I7G983 = "\"C:\\Users\\Admin\\AppData\\Roaming\\xenor\\yavascript.exe\""	advancePayment-pdf.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\Rmc-I7G983 = "\"C:\\Users\\Admin\\AppData\\Roaming\\xenor\\yavascript.exe\""	yavascript.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 2 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	advancePayment-pdf.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	yavascript.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 564 wrote to memory of 2780	564	advancePayment-pdf.exe	30
PID 564 wrote to memory of 2780	564	advancePayment-pdf.exe	30
PID 564 wrote to memory of 2780	564	advancePayment-pdf.exe	30
PID 564 wrote to memory of 2780	564	advancePayment-pdf.exe	30

C:\Users\Admin\AppData\Local\Temp\advancePayment-pdf.exe
"C:\Users\Admin\AppData\Local\Temp\advancePayment-pdf.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:564
- C:\Users\Admin\AppData\Roaming\xenor\yavascript.exe
  "C:\Users\Admin\AppData\Roaming\xenor\yavascript.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  PID:2780

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

\Users\Admin\AppData\Roaming\xenor\yavascript.exe

Filesize
537KB

MD5
821cd5ef8d94deeeee5b7cb82379c212

SHA1
977f8407a7033b20b96fec686e918c177160ae92

SHA256
8038ff6a41673eb151cdb7f03872c741dc762834c856d70030cd54af744e36a4

SHA512
0f4f856cf1cc965a5be602503eb3f26cee460c5b2ce709ed2f7672973da801a4cc9bd7a67f9b2ffe7471421b67d44a51c302ff98bd065febbf1d73ebe54a9881

Download Submit
memory/564-1-0x0000000002C60000-0x0000000002D60000-memory.dmp

Filesize
1024KB

Download
memory/564-2-0x0000000000300000-0x000000000037A000-memory.dmp

Filesize
488KB

Download
memory/564-3-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/564-15-0x0000000002C60000-0x0000000002D60000-memory.dmp

Filesize
1024KB

Download
memory/564-16-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/564-14-0x0000000000300000-0x000000000037A000-memory.dmp

Filesize
488KB

Download
memory/564-13-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2780-21-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2780-26-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2780-19-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2780-22-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2780-23-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2780-24-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2780-25-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2780-20-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2780-27-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2780-28-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2780-29-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2780-30-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2780-31-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2780-32-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads