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TROJ_DLOADR.AUSUMP

July 26, 2018
 Analysis by: Michael Jhon Ofiaza
 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size:

7,768 bytes

File Type:

Other

Memory Resident:

Yes

Initial Samples Received Date:

25 Jul 2018

Payload:

Connects to URLs/IPs, Downloads files

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan adds the following processes:

  • %System root%system32\dllhost.exe

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • ast-{56AD2219-B407-643f-AEEA-9906EF156F66}

Other Details

This Trojan does the following:

  • Injects the downloaded file to the created dllhost.exe
  • It connects to the following URL to download file:
    • http://{BLOCKED}.{BLOCKED}.72.223:8080/git/wiki.asp?id=519358d46ad51d9628cbe9059a502b67
    • http://{BLOCKED}.{BLOCKED}.72.223:8080/git/glfw.wasm
    • http://{BLOCKED}.{BLOCKED}.72.223:8080/rt/flolroam9415u2es53ogc176ok.wasm

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.404.03

FIRST VSAPI PATTERN DATE:

26 Jul 2018

VSAPI OPR PATTERN File:

14.405.00

VSAPI OPR PATTERN Date:

27 Jul 2018

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADR.AUSUMP. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information:


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