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kurogazenet_dknn_04_.exe

Rutubo

AVSoftware Ltd

The application kurogazenet_dknn_04_.exe, “Rutubo Setup ” by AVSoftware has been detected as a potentially unwanted program by 1 anti-malware scanner with very strong indications that the file is a potential threat. The program is a setup application that uses the Inno Setup installer. The setup program uses the InstallCore engine which may bundle additional software offers including toolbars and browser extensions. The file has been seen being downloaded from www.signbitsfun.com.
Publisher:
Dom   (signed by AVSoftware Ltd)

Product:
Rutubo

Description:
Rutubo Setup

Version:
5.0.2.1

MD5:
d3079e9220c3165c97e609ae591b77bb

SHA-1:
c1c5329f4f8dcee7f38cc49df1fd7b3f6bdfe65e

SHA-256:
1765a509b7c3e39bd95b7803e8811c6170f7d5dc3eaaba964b3e80cf7b99d243

Scanner detections:
1 / 68

Status:
Potentially unwanted

Explanation:
Uses the InstallCore download manager to install additional potentially unwanted software which may include extensions such as DealPly and various toolbars.

Analysis date:
1/12/2025 4:28:14 AM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.InstallCore.AVSoftwa.Installer (M)
16.6.13.12

File size:
968.8 KB (992,064 bytes)

Product version:
2.3.8

File type:
Executable application (Win32 EXE)

Installer:
Inno Setup

Language:
Language Neutral

Common path:
C:\users\{user}\appdata\local\microsoft\windows\inetcache\ie\{random}\kurogazenet_dknn_04_.exe

Digital Signature
Signed by:
AVSoftware Ltd

Authority:
GlobalSign nv-sa

Valid from:
12/31/2015 6:55:52 AM

Valid to:
12/31/2016 6:55:52 AM

Subject:
CN=AVSoftware Ltd, O=AVSoftware Ltd, L=Sofia, C=BG

Issuer:
CN=GlobalSign CodeSigning CA - SHA256 - G2, O=GlobalSign nv-sa, C=BE

Serial number:
112134814B6C56AF7047C195AE1D737EC185

File PE Metadata
Compilation timestamp:
6/19/1992 3:22:17 PM

OS version:
1.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
2.25

CTPH (ssdeep):
24576:U6WsEh1GXeQO2Our4MkO6H12ro8JG8Gf5l1nRobv:1ch10ZO2OuUu6H0rowyfD0

Entry address:
0xA5F8

Entry point:
55, 8B, EC, 83, C4, C4, 53, 56, 57, 33, C0, 89, 45, F0, 89, 45, DC, E8, CE, 8A, FF, FF, E8, D5, 9C, FF, FF, E8, 64, 9F, FF, FF, E8, 07, A0, FF, FF, E8, A6, BF, FF, FF, E8, 11, E9, FF, FF, E8, 78, EA, FF, FF, 33, C0, 55, 68, C9, AC, 40, 00, 64, FF, 30, 64, 89, 20, 33, D2, 55, 68, 92, AC, 40, 00, 64, FF, 32, 64, 89, 22, A1, 14, C0, 40, 00, E8, 26, F5, FF, FF, E8, 11, F1, FF, FF, 80, 3D, 34, B2, 40, 00, 00, 74, 0C, E8, 23, F6, FF, FF, 33, C0, E8, C4, 97, FF, FF, 8D, 55, F0, 33, C0, E8, B6, C5, FF, FF, 8B, 55...
 
[+]

Entropy:
7.9332

Packer / compiler:
Inno Setup v5.x - Installer Maker

Code size:
39.5 KB (40,448 bytes)

The file kurogazenet_dknn_04_.exe has been seen being distributed by the following URL.

http://www.signbitsfun.com/c?x=q5x4QmflMUf9wLsKsnliNNC VDIgw/stw4iHWTubG4k=&c=2sOVAdsCtl85CNTKd9ojELOUo8ZIeeOq4QNTeO2KcrYDQt3cyU/PACn6RrjS2j3I8VDTtdF3iT8WZMfo/NzybODJNvmQEbHwn0kk3mIcyly0gCKHiZiH61LMHhHj8cn7&downloadAs=Kurogazenet_DKNN_04_.exe&fallback_url=https://s01.solidfilesusercontent.com/MjQxOWU0YTdlNWFmYTg4NzdiOTdiMGQ5ZDBhNDhlM2JhMjhlOTY3NToxYkJ2ZG06R1d5T200TFBPclRBdjhUVm1tUmNpc1F6UlFZ/.../Kurogaze.net_DKNN_04_HD.mp4

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