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TROJ_BAYROB.VUR

February 21, 2018
 Analysis by: Nikko Tamana
 ALIASES:

W32/Bayrob.BL!tr (Fortinet), Trojan.Win32.Bayrob (Ikarus), Trojan:Win32/Nivdort.A (Microsoft), a variant of Win32/Bayrob.BL trojan (NOD32), Trojan.Bayrob!gen9 (Norton), Mal/Bayrob-C (Sophos)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


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:

1,077,760 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

20 Feb 2018

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 drops the following files:

  • %Windows%\rorayerkx\cfg
  • %Windows%\rorayerkx\lck
  • %Windows%\rorayerkx\rng
  • %Windows%\rorayerkx\run
  • %Windows%\rorayerkx\tst

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

It drops the following copies of itself into the affected system:

  • %Windows%\ltipubkrrk.exe
  • %Windows%\vufirixwcxvo.exe

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

It creates the following folders:

  • %Windows%\rorayerkx

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

Autostart Technique

This Trojan registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\Shadow Coordinator Peer Experience
Type = 00000110

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\Shadow Coordinator Peer Experience
Start = 00000002

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\Shadow Coordinator Peer Experience
ErrorControl = 00000000

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\Shadow Coordinator Peer Experience
ImagePath = %Windows%\vufirixwcxvo.exe

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\Shadow Coordinator Peer Experience
DisplayName = "Shadow Coordinator Peer Experience"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\Shadow Coordinator Peer Experience
ObjectName = "LocalSystem"

It registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services
Shadow Coordinator Peer Experience =

Other System Modifications

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center\Svc
FirewallDisableNotify = 00000001

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center\Svc
AntiVirusDisableNotify = 00000001

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://185.{BLOCKED}73.77/index.php
  • http://alon{BLOCKED}l.net/index.php
  • http://alon{BLOCKED}e.net/index.php
  • http://ball{BLOCKED}.net/index.php
  • http://ball{BLOCKED}.net/index.php
  • http://dece{BLOCKED}blood.net/index.php
  • http://dece{BLOCKED}daily.net/index.php
  • http://deep{BLOCKED}y.ru/index.php
  • http://deep{BLOCKED}.net/index.php
  • http://deep{BLOCKED}e.net/index.php
  • http://fill{BLOCKED}.net/index.php
  • http://fill{BLOCKED}.net/index.php
  • http://lear{BLOCKED}e.net/index.php
  • http://lear{BLOCKED}e.net/index.php
  • http://life{BLOCKED}y.net/index.php
  • http://life{BLOCKED}.net/index.php
  • http://life{BLOCKED}.ru/index.php
  • http://life{BLOCKED}.net/index.php
  • http://life{BLOCKED}e.net/index.php
  • http://long{BLOCKED}.net/index.php
  • http://long{BLOCKED}.ru/index.php
  • http://long{BLOCKED}e.net/index.php
  • http://long{BLOCKED}e.net/index.php
  • http://lord{BLOCKED}epings.ru/index.php
  • http://mout{BLOCKED}l.net/index.php
  • http://much{BLOCKED}.net/index.php
  • http://piec{BLOCKED}e.net/index.php
  • http://plan{BLOCKED}dy.net/index.php
  • http://plan{BLOCKED}l.net/index.php
  • http://plan{BLOCKED}l.ru/index.php
  • http://push{BLOCKED}d.net/index.php
  • http://said{BLOCKED}t.net/index.php
  • http://said{BLOCKED}e.net/index.php
  • http://sens{BLOCKED}e.net/index.php
  • http://shal{BLOCKED}er.net/index.php
  • http://stic{BLOCKED}ut.net/index.php
  • http://stic{BLOCKED}ut.net/index.php
  • http://stic{BLOCKED}s.net/index.php
  • http://stic{BLOCKED}l.net/index.php
  • http://stic{BLOCKED}ne.net/index.php
  • http://take{BLOCKED}l.net/index.php
  • http://take{BLOCKED}.net/index.php
  • http://take{BLOCKED}.ru/index.php
  • http://till{BLOCKED}.net/index.php
  • http://trie{BLOCKED}e.net/index.php
  • http://very{BLOCKED}.net/index.php
  • http://wait{BLOCKED}.net/index.php
  • http://week{BLOCKED}y.net/index.php
  • http://yoos{BLOCKED}t/index.php
  • http://your{BLOCKED}.net/index.php
  • http://your{BLOCKED}.net/index.php
  • http://your{BLOCKED}.net/index.php
  • http://your{BLOCKED}e.net/index.php
  • http://your{BLOCKED}.net/index.php

NOTES:
It creates registry to disable Security Center functions.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.978.08

FIRST VSAPI PATTERN DATE:

20 Feb 2018

VSAPI OPR PATTERN File:

13.979.00

VSAPI OPR PATTERN Date:

21 Feb 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

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Windows%\rorayerkx

Step 5

Delete this registry key

[ 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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services
    • Shadow Coordinator Peer Experience

Step 6

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\Svc
    • FirewallDisableNotify = 00000001
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\Svc
    • AntiVirusDisableNotify = 00000001

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_BAYROB.VUR. 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 this Knowledge Base page for more information.


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