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MailRuUpdater.exe

MailRuUpdater

LLC Mail.Ru

The executable MailRuUpdater.exe has been detected as malware by 1 anti-virus scanner. This is a setup program which is used to install the application. It runs as a scheduled task under the Windows Task Scheduler named MailRuUpdater triggered to execute each time a user logs in. The file has been seen being downloaded from mailruupdater.cdnmail.ru.
Publisher:
Mail.Ru  (signed by LLC Mail.Ru)

Product:
MailRuUpdater

Description:
Mail.Ru updater

Version:
1.25.0.258

MD5:
9452b170320f7cf6c7b56432022e2b5d

SHA-1:
afcdb18756c43913dd476d61e36edceb3a6ad6b0

SHA-256:
747f874ab29e3d978809586f193d96a01a0229b96b7e6f0d7789749e88a8f84d

Scanner detections:
1 / 68

Status:
Malware

Analysis date:
6/26/2025 8:44:07 PM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
Win32.Generic
16.2.24.13

File size:
5.8 MB (6,118,672 bytes)

Product version:
1.25.0.258

Copyright:
Copyright 2015

Original file name:
MailRuUpdater.exe

File type:
Executable application (Win32 EXE)

Common path:
C:\users\{user}\appdata\local\temp\mailruupdater.exe

Digital Signature
Signed by:
LLC Mail.Ru

Authority:
thawte, Inc.

Valid from:
8/6/2015 3:00:00 AM

Valid to:
10/5/2017 2:59:59 AM

Subject:
CN=LLC Mail.Ru, O=LLC Mail.Ru, L=Moscow, S=Moscow, C=RU

Issuer:
CN=thawte SHA256 Code Signing CA, O="thawte, Inc.", C=US

Serial number:
2019877A933D8E2E71548EA4AB4827F1

File PE Metadata
Compilation timestamp:
2/18/2016 4:22:48 PM

OS version:
5.1

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
12.0

CTPH (ssdeep):
98304:jyuXTE9JqtcFqVfbrLrsppHyz4akWArR0uiYRXXCWLzYsyK7S:TDtcYVfbrLrsppykF7XSEYsyx

Entry address:
0x31D92B

Entry point:
E8, 8A, A0, 01, 00, E9, 7F, FE, FF, FF, CC, CC, CC, CC, CC, CC, CC, CC, CC, CC, CC, 55, 8B, EC, 81, EC, 1C, 01, 00, 00, A1, E0, F5, 96, 00, 33, C5, 89, 45, FC, 8B, 4D, 08, 8B, 55, 0C, 89, 8D, 00, FF, FF, FF, 53, 8B, 5D, 14, 89, 9D, FC, FE, FF, FF, 56, 8B, 75, 10, 89, B5, 04, FF, FF, FF, 85, C9, 75, 24, 85, D2, 74, 20, E8, 7F, B6, FF, FF, C7, 00, 16, 00, 00, 00, E8, 50, 13, 01, 00, 5E, 5B, 8B, 4D, FC, 33, CD, E8, 9F, 89, FF, FF, 8B, E5, 5D, C3, 85, F6, 74, DC, 85, DB, 74, D8, 83, FA, 02, 0F, 82, D3, 02, 00...
 
[+]

Code size:
4.5 MB (4,683,776 bytes)

Scheduled Task
Task name:
MailRuUpdater

Trigger:
Logon (Runs on logon)


The file MailRuUpdater.exe has been seen being distributed by the following URL.

http://mailruupdater.cdnmail.ru/MailRuUpdater.exe

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