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