TrojanSpy.JS.TWINFLOWER.A

April 03, 2020
 Analysis by: Bren Matthew Ebriega
 ALIASES:

Null

 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

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

It requires its main component to successfully perform its intended routine. However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

11,549 bytes

File Type:

JS

Memory Resident:

No

Initial Samples Received Date:

27 Mar 2020

Payload:

Connects to URLs/IPs, Steals information

Arrival Details

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

Other System Modifications

This Trojan Spy adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\VB and VBA Program Settings
ck_m = {generated guid}

HKEY_CURRENT_USER\Software\VB and VBA Program Settings
{generated guid} = {last recorded time}

Information Theft

This Trojan Spy gathers the following data:

  • Browser Cookies associated with the following URL's:
    • mediav.com
    • scorecardresearch.com
    • so.com
    • hao.360.com
    • hao.360.cn
    • 360.com
    • 360.cn
    • 1688.com
    • nzwgs.com
    • nzbdw.com
    • s3m.nzwgs.com
    • s3.nzbdw.com,
    • s3m.mediav.com
    • s3m.nzwgs.com
    • tieba.baidu.com
    • zhidao.baidu.com
    • baike.baidu.com
    • map.baidu.com
    • wenku.baidu.com
    • baijia.baidu.com
    • youxi.baidu.com
    • pan.baidu.com
    • fanyi.baidu.com
    • news.baidu.com
    • jingyan.baidu.com
    • image.baidu.com
    • baijiahao.baidu.com
    • ir.baidu.com
    • e.baidu.com
    • koubei.baidu.com
    • xueshu.baidu.com
    • tongji.baidu.com
    • music.baidu.com
    • passport.baidu.com
    • ziyuan.baidu.com
    • site.baidu.com
    • jianyi.baidu.com
    • 123.baidu.com
    • house.baidu.com
    • mbd.baidu.com
    • fengchao.baidu.com
    • v.baidu.com
    • app.baidu.com
    • ditu.baidu.com
    • top.baidu.com
    • bce.baidu.com
    • anquan.baidu.com
    • wiki.baidu.com
    • icode.baidu.com
    • haokan.baidu.com
    • smartprogram.baidu.com
    • sp0.baidu.com
    • developer.baidu.com
    • cloud.baidu.com
    • m.baidu.com
    • yq01.baidu.com
    • naotu.baidu.com
    • pos.baidu.com
    • ai.baidu.com
    • union.baidu.com
    • index.baidu.com
    • qiao.baidu.com
    • mssp.baidu.com
    • baobao.baidu.com
    • help.baidu.com
    • zhaopin.baidu.com
    • maps.baidu.com
    • video.baidu.com
    • zhannei.baidu.com
    • xin.baidu.com
    • echarts.baidu.com
    • www.baidu.com
    • baidu.com

Stolen Information

This Trojan Spy sends the gathered information via HTTP POST to the following URL:

  • http://yky.{BLOCKED}e.com:38275/api/ck.php?m={generated guid}

Other Details

This Trojan Spy requires its main component to successfully perform its intended routine.

However, as of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.780.03

FIRST VSAPI PATTERN DATE:

02 Apr 2020

VSAPI OPR PATTERN File:

15.781.00

VSAPI OPR PATTERN Date:

03 Apr 2020

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings
    • ck_m = {generated guid}
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings
    • {generated guid} = {last recorded time}

Step 4

Scan your computer with your Trend Micro product to delete files detected as TrojanSpy.JS.TWINFLOWER.A. 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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