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skype.exe

The application skype.exe has been detected as a potentially unwanted program by 20 anti-malware scanners. The program is a setup application that uses the NSIS (Nullsoft Scriptable Install System) installer, however the file is not signed with an authenticode signature from a trusted source. The setup routine uses the RevenYou.Com Pay Per Install platform (OutBrowse) which bundles additional software offers inclduing toolbars, extensions, PC utilities as well as other PUPs. The file has been seen being downloaded from www.ifreedownloadss.com and multiple other hosts.
MD5:
48ef1f0d650eede0d13570605ffcd75b

SHA-1:
20ecfb2ca6ab2cd8b49effec5f5bf12e791b9ef5

SHA-256:
d0751140b7afbd5832420820e29fb8424337bb604d2236b05de57e96e7cfb3fc

Scanner detections:
20 / 68

Status:
Potentially unwanted

Explanation:
Bundles additional adware offers during download and installation using the OutBrowse installer.

Analysis date:
4/19/2024 7:54:22 PM UTC  (today)

Scan engine
Detection
Engine version

Agnitum Outpost
PUA.OutBrowse
7.1.1

AhnLab V3 Security
PUP/Win32.OutBrowse
2014.03.07

AVG
MalSign.OutBrowse
2015.0.3402

Baidu Antivirus
HackTool.Win32.OutBrowse
4.0.3.14725

Comodo Security
Application.Win32.OutBrowse.~B
17897

Dr.Web
Adware.Downware.1676
9.0.1.0206

ESET NOD32
Win32/OutBrowse (variant)
8.9511

Fortinet FortiGate
Riskware/NSIS_OutBrowse
7/25/2014

K7 AntiVirus
Trojan
13.176.11367

Kaspersky
not-a-virus:Downloader.NSIS.OutBrowse
14.0.0.3506

Malwarebytes
PUP.Optional.Smart
v2014.07.25.07

McAfee
Artemis!48EF1F0D650E
5600.7058

NANO AntiVirus
Trojan.Win32.OutBrowse.crkqqe
0.28.0.58101

Qihoo 360 Security
Win32/Virus.Downloader.ad6
1.0.0.1015

Quick Heal
Downloader.NSIS.OutBrowse.b (Not a Virus)
7.14.12.00

Sophos
OutBrowse
4.98

Trend Micro House Call
TROJ_GEN.R0CBC0OBK14
7.2.206

Trend Micro
TROJ_GEN.R0CBC0OBK14
10.465.25

Vba32 AntiVirus
Downloader.OutBrowse
3.12.24.3

VIPRE Antivirus
OutBrowse
27158

File size:
601.4 KB (615,797 bytes)

File type:
Executable application (Win32 EXE)

Installer:
NSIS (Nullsoft Scriptable Install System)

Language:
Language Neutral

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

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

OS version:
4.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
6.0

CTPH (ssdeep):
12288:u35cWN3aPbD3x6imu00ufz6HSkdxvN+RrA55N2uSgcbUe6Q8SAEe3nTJlG:uprNKPbDVmH0uf+HSkHl+RsnNFSgcD6W

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:
7.9777

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 3 URLs.

http://www.ifreedownloadss.com/.../download.php?id=52f3dabc29188&i=adus3

http://www.ifreedownloadss.com/.../download.php?id=531678fc80756&i=adus3

http://www.ifreedownloadss.com/.../download.php?id=530a9b8da7ad0&i=adus2

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