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skype.exe

YES APPS

This is the OutBrowse Revenyou installer which bundles offers for additional third party applications that may be unwanted and installed without consent. The application skype.exe by YES APPS has been detected as adware 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 OutBrowse Revenyou installer. The file has been seen being downloaded from www.ifreeupdates.com.
Publisher:
YES APPS  (signed and verified)

MD5:
ca09e6be80aa5a1e6bd5ff20f9ba29f4

SHA-1:
5f81e154b412c6f7982465ca35ae039aa5352810

SHA-256:
e56d728cf46238364c1ff45c744136840c67cdccb9426f31b61335869a3f428d

Scanner detections:
1 / 68

Status:
Adware

Note:
Our current pool of anti-malware engines have not currently detected this file, however based on our own detection heuristics we feel that this file is unwanted.

Description:
This is also known as bundleware, or downloadware, which is an downloader designed to simply deliver ad-supported offers in the setup routine of an otherwise legitimate software.

Analysis date:
12/25/2024 4:30:39 AM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Outbrowse.YESAPPS.Bundler (M)
16.5.22.2

File size:
569.9 KB (583,616 bytes)

File type:
Executable application (Win32 EXE)

Bundler/Installer:
OutBrowse Revenyou (using Nullsoft Install System)

Language:
Language Neutral

Common path:
C:\users\{user}\downloads\skype.exe

Digital Signature
Signed by:
YES APPS

Authority:
thawte, Inc.

Valid from:
1/3/2015 4:00:00 PM

Valid to:
12/17/2015 3:59:59 PM

Subject:
CN=YES APPS, O=YES APPS, L=Dublin, S=Dublin, C=IE

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

Serial number:
04F221BAF46F2D1021A08E9C92E49D2C

File PE Metadata
Compilation timestamp:
12/5/2009 2:50:52 PM

OS version:
4.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
6.0

CTPH (ssdeep):
6144:fe34K77tjPZEMkCH7eR3DEaVC43qqQE5aNhGyCAqml0cfBASurPGnpOmEO9jtxoi:o77faCH7zaUU52fGR8lTOenpO29/o2A0

Entry address:
0x30FA

Entry point:
81, EC, 80, 01, 00, 00, 53, 55, 56, 33, DB, 57, 89, 5C, 24, 18, C7, 44, 24, 10, 60, 91, 40, 00, 33, F6, C6, 44, 24, 14, 20, FF, 15, 30, 70, 40, 00, 68, 01, 80, 00, 00, FF, 15, B0, 70, 40, 00, 53, FF, 15, 7C, 72, 40, 00, 6A, 08, A3, 18, EC, 42, 00, E8, F1, 2B, 00, 00, A3, 64, EB, 42, 00, 53, 8D, 44, 24, 34, 68, 60, 01, 00, 00, 50, 53, 68, 98, 8F, 42, 00, FF, 15, 58, 71, 40, 00, 68, 54, 91, 40, 00, 68, 60, E3, 42, 00, E8, A4, 28, 00, 00, FF, 15, AC, 70, 40, 00, BF, 00, 40, 43, 00, 50, 57, E8, 92, 28, 00, 00...
 
[+]

Entropy:
7.9768

Packer / compiler:
Nullsoft install system v2.x

Code size:
23.5 KB (24,064 bytes)

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

http://www.ifreeupdates.com/.../download.php?id=54b1dda85ca2a&i=150302

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