General
- Target MasosnClient.exe
- Size 49KB
- Sample260718-hst2eaez4w
- SHA256 f6fc76f47e5ac1ea1abd9ba9b8f826e54ab2ee402b7d4f2a87eb779b5984d9b2
- MD5 c6f372194be6157cb39d5cdb7e3d1f4e
- SHA1 157384ccfc1085c64be788d6e97b8b4d99cbb5f8
- SHA512 1a32d6f4274a2db7a1052997e1ed50dbb06a3c070ef6898ebdda316014e656686ec4d6fe9b55f7f355f4edbb8157d77729941cbc3971963a442800a1a07da7ba
- SSDEEP 1536:wTlDDWhWZV1HaAKwGRXlVtYPUx217dSn/39Mab1GvgbOEU:wRDDWEV1HaAKwGRXDtYPUx217dkNb1vq
- TLSH T13F33E79DA3D84131E4BF56B25D77424883B0BAA38466D79F7CC405CA2723B95CA42EF3
- MD5 SHA1 SHA512 SSDEEP TLSH
Behavioral task
behavioral1
Sample
MasosnClient.exe
Resource
win10v2004-20260513-en
Malware Config
Extracted
-
neptunerat
-
30.tcp.cpolar.top:12558
-
filename
USB.exe
-
group
MasonGroup
-
key
USmFoVvVsJx5YJiH
-
rat_name
MasonRAT
Targets
-
- Target MasosnClient.exe
- Size 49KB
- SHA256 f6fc76f47e5ac1ea1abd9ba9b8f826e54ab2ee402b7d4f2a87eb779b5984d9b2
- MD5 c6f372194be6157cb39d5cdb7e3d1f4e
- SHA1 157384ccfc1085c64be788d6e97b8b4d99cbb5f8
- SHA512 1a32d6f4274a2db7a1052997e1ed50dbb06a3c070ef6898ebdda316014e656686ec4d6fe9b55f7f355f4edbb8157d77729941cbc3971963a442800a1a07da7ba
- SSDEEP 1536:wTlDDWhWZV1HaAKwGRXlVtYPUx217dSn/39Mab1GvgbOEU:wRDDWEV1HaAKwGRXDtYPUx217dkNb1vq
- TLSH T13F33E79DA3D84131E4BF56B25D77424883B0BAA38466D79F7CC405CA2723B95CA42EF3
- MD5 SHA1 SHA512 SSDEEP TLSH
-
Detects NeptuneRAT stealer
-
Checks computer location settings
Looks up country code configured in the registry, likely geofence.
-
Event Triggered Execution: Component Object Model Hijacking
Adversaries may establish persistence by executing malicious content triggered by hijacked references to Component Object Model (COM) objects.
-
Executes dropped EXE
-
Modifies system executable filetype association
-
Contacts third-party web service commonly abused for C2
Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.
-
Writes to the Master Boot Record (MBR)
Bootkits write to the MBR to gain persistence at a level below the operating system.
MITRE ATT&CK Enterprise v16
Persistence
Event Triggered Execution
2Change Default File Association
1Component Object Model Hijacking
1Pre-OS Boot
1Bootkit
1Privilege Escalation
Event Triggered Execution
2Change Default File Association
1Component Object Model Hijacking
1