nyan-cat-screensaver_setup.exe

ISfreemium

The file is a bundle distribution and utilizes the installCore download manager to distribute this potentially unwanted software. The application nyan-cat-screensaver_setup.exe by ISfreemium has been detected as adware by 7 anti-malware scanners. The program is a setup application that uses the installCore 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.windows8downloads.com.
Publisher:
ISfreemium  (signed and verified)

MD5:
0340046454802878b84d341d9f544da5

SHA-1:
9f7fe87b1a08a7610e3dd5dcac6047baefaa979f

SHA-256:
20f6aaa09897ca73ece2ad245a12277f2dd741ad8449e6c7a7c5c4b6c483eb2d

Scanner detections:
7 / 68

Status:
Adware

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

Description:
This 'download manager' is also considered bundleware, a utility designed to download software (possibly legitimate or opensource) and bundle it with a number of optional offers including ad-supported utilities, toolbars, shopping comparison tools and browser extensions.

Analysis date:
12/15/2017 11:15:09 PM UTC  (today)

Scan engine
Detection
Engine version

avast!
Win32:Malware-gen
160518-2

Emsisoft Anti-Malware
Gen:Variant.Strictor.102633
9.0.0.4157

ESET NOD32
Win32/InstallCore.D potentially unwanted application
8.0.319.0

F-Prot
W32/InstallCore.R.gen
4.6.5.141

Norman
Gen:Variant.Strictor.102633
19.05.2016 01:04:49

Reason Heuristics
PUP.installCore.ISfreemi.Installer (M)
16.6.9.21

File size:
1.3 MB (1,349,984 bytes)

File type:
Executable application (Win32 EXE)

Bundler/Installer:
installCore (using Inno Setup)

Common path:
C:\users\{user}\downloads\nyan-cat-screensaver_setup.exe

Digital Signature
Signed by:

Authority:
COMODO CA Limited

Valid from:
7/3/2013 12:00:00 AM

Valid to:
7/3/2014 11:59:59 PM

Subject:
CN=ISfreemium, O=ISfreemium, STREET=63 Rothschild 63 BV, L=Tel-Aviv, S=N/A, PostalCode=65785, C=IL

Issuer:
CN=COMODO Code Signing CA 2, O=COMODO CA Limited, L=Salford, S=Greater Manchester, C=GB

Serial number:
009B517CAF08AA1A85822DB0CE5E9169FE

File PE Metadata
Compilation timestamp:
6/20/1992 6:22:17 AM

OS version:
1.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
2.25

CTPH (ssdeep):
24576:IyMJfslYDnygzhOi8c78T87bSSU743hW22eGM6JDmrwhpYv4AABhG0hqc:IlJfslAy68coT8xU743hvGM6pmropYvU

Entry address:
0x98CC

Entry point:
55, 8B, EC, 83, C4, CC, 53, 56, 57, 33, C0, 89, 45, F0, 89, 45, DC, E8, FA, 97, FF, FF, E8, 01, AA, FF, FF, E8, 2C, CC, FF, FF, E8, 73, CC, FF, FF, E8, 0A, F3, FF, FF, E8, 71, F4, FF, FF, 33, C0, 55, 68, 76, 9F, 40, 00, 64, FF, 30, 64, 89, 20, 33, D2, 55, 68, 2C, 9F, 40, 00, 64, FF, 32, 64, 89, 22, A1, 14, B0, 40, 00, E8, 9B, FE, FF, FF, E8, 26, FA, FF, FF, 8D, 55, F0, 33, C0, E8, E0, D0, FF, FF, 8B, 55, F0, B8, D8, BD, 40, 00, E8, AB, 98, FF, FF, 6A, 02, 6A, 00, 6A, 01, 8B, 0D, D8, BD, 40, 00, B2, 01, B8...
 
[+]

Entropy:
7.8070

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

Code size:
36 KB (36,864 bytes)

The file nyan-cat-screensaver_setup.exe has been seen being distributed by the following URL.

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