General
- Target SteamWebHelper.exe
- Size 12.5MB
- Sample261019-bykllaxybw
- SHA256 fe4698faf6bcd3d5885563c79348c5bbc807f9037ac6b4d9afdae3b8f65a71a3
- MD5 0d57a643b0aa0370f6ea94716c8de1d1
- SHA1 a950e3c6a7b8ff8874eafaa1800af54e66a22995
- SHA512 7b1da5313d8a49a972b893fc01f595712888dd924f5e42685a93333e31dd58b002364787d45e8cedabd991698a158c57af3c63a5678bd381725157154b547c49
- SSDEEP 98304:brj0n2rKav4lGEWefz5B892Pupxc5uIEuHYS+bCtvKshG:3KGuGE7orc5fnBv
- TLSH T170D616016F9E59A9D1C9CC30C24A8BA38F2130DB1A7AB5BF55D202952F7D7B46F2C319
- MD5 SHA1 SHA512 SSDEEP TLSH
Static task
static1
Behavioral task
behavioral1
Sample
SteamWebHelper.exe
Resource
win11ltsc2024-20260911-en
Malware Config
Targets
-
- Target SteamWebHelper.exe
- Size 12.5MB
- SHA256 fe4698faf6bcd3d5885563c79348c5bbc807f9037ac6b4d9afdae3b8f65a71a3
- MD5 0d57a643b0aa0370f6ea94716c8de1d1
- SHA1 a950e3c6a7b8ff8874eafaa1800af54e66a22995
- SHA512 7b1da5313d8a49a972b893fc01f595712888dd924f5e42685a93333e31dd58b002364787d45e8cedabd991698a158c57af3c63a5678bd381725157154b547c49
- SSDEEP 98304:brj0n2rKav4lGEWefz5B892Pupxc5uIEuHYS+bCtvKshG:3KGuGE7orc5fnBv
- TLSH T170D616016F9E59A9D1C9CC30C24A8BA38F2130DB1A7AB5BF55D202952F7D7B46F2C319
- MD5 SHA1 SHA512 SSDEEP TLSH
Creates a file in the Startup directory
A file was written to a Windows startup folder. Files in these directories are executed automatically when a user logs on or an application initializes.
Executes dropped EXE
Outbound SSH connection to public host
SSH is used for remote access. This may indicate SSH host discovery, encrypted C2 traffic, or data exfiltration.
Adds Run key to start application
Contacts third-party web service commonly abused for C2
Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.
Discovers running processes
Running process information can be used to identify security tools or plan follow-on actions.
Executes a VBScript file via the Windows Script Host.
MITRE ATT&CK Enterprise v16
Execution
Command and Scripting Interpreter
2PowerShell
1Visual Basic
1Scheduled Task/Job
1Scheduled Task
1Persistence
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
2Scheduled Task/Job
1Scheduled Task
1Privilege Escalation
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
2Scheduled Task/Job
1Scheduled Task
1Defense Evasion
Hide Artifacts
1Hidden Files and Directories
1Modify Registry
1