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cytiwebsetup.exe

Girafarri

This is the installer/setup program for a Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The application cytiwebsetup.exe by Girafarri has been detected as adware by 18 anti-malware scanners. The program is a setup application that uses the NSIS (Nullsoft Scriptable Install System) installer. It will plug into the web browser and display context-based advertisements by overwriting existing ads or by inserting new ones on various web pages. The file has been seen being downloaded from install-cdn.cytiweb.net. While running, it connects to the Internet address api.yontoo.com on port 80 using the HTTP protocol.
Publisher:
Girafarri  (signed and verified)

MD5:
2ac5cca1348c7ded0aef842b91d11511

SHA-1:
c81a3397e60a2050099417a69633cd8dccf90632

SHA-256:
a3fe7888634ec25e18cfab8f3f85e552a4e0426a6142e5217ce093ca312ead8b

Scanner detections:
18 / 68

Status:
Adware

Explanation:
Injects advertising in the web browser in various formats.

Analysis date:
4/26/2024 9:06:16 AM UTC  (today)

Scan engine
Detection
Engine version

AhnLab V3 Security
PUP/Win32.BrowseFox
2015.02.26

Avira AntiVirus
ADWARE/BrowseFox.Gen
7.11.212.128

avast!
Win32:PUP-gen [PUP]
2014.9-150306

AVG
BrowseFox.H
2016.0.3179

Baidu Antivirus
Adware.Win32.BrowseFox
4.0.3.1536

Dr.Web
Trojan.BPlug.181
9.0.1.065

ESET NOD32
Win32/BrowseFox.C potentially unwanted
9.11232

F-Prot
W32/S-c9f3cc61
v6.4.7.1.166

G Data
NSIS.Application.BrowseFox
15.3.25

IKARUS anti.virus
AdWare.BrowseFox
t3scan.1.8.6.0

K7 AntiVirus
Unwanted-Program
13.198.15085

Malwarebytes
PUP.Optional.BPlug
v2015.03.06.05

McAfee
BrowseFox-FWC
5600.6835

NANO AntiVirus
Trojan.Win32.BPlug.dfsehz
0.30.0.296

Qihoo 360 Security
Win32/Virus.Adware.80e
1.0.0.1015

Reason Heuristics
PUP.Installer.Yontoo
15.3.6.5

Rising Antivirus
NS:PUF.SilenceInstaller!1.9DDF
23.00.65.15304

VIPRE Antivirus
Trojan.Win32.Generic
37896

File size:
569.5 KB (583,200 bytes)

File type:
Executable application (Win32 EXE)

Installer:
NSIS (Nullsoft Scriptable Install System)

Common path:
C:\users\{user}\appdata\local\microsoft\windows\inetcache\content.ie5\ts5p40wa\cytiwebsetup.exe

Digital Signature
Signed by:
Girafarri

Authority:
VeriSign, Inc.

Valid from:
4/22/2014 2:00:00 AM

Valid to:
4/23/2015 1:59:59 AM

Subject:
CN=Girafarri, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=Girafarri, L=Santa Monica, S=California, C=US

Issuer:
CN=VeriSign Class 3 Code Signing 2010 CA, OU=Terms of use at https://www.verisign.com/rpa (c)10, OU=VeriSign Trust Network, O="VeriSign, Inc.", C=US

Serial number:
2FB197284297D52000599AA2F7D0668F

File PE Metadata
Compilation timestamp:
12/5/2009 11:52:01 PM

OS version:
4.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
6.0

CTPH (ssdeep):
12288:GcpHN7Y079D1s15Ap/G/8/3D0Fw/tN8dkmLtpHHHrh7x5XAe:Ggth79D6j8/z0FmcLbH1xxb

Entry address:
0x30CB

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, 38, 6F, 44, 00, E8, F1, 2B, 00, 00, A3, 84, 6E, 44, 00, 53, 8D, 44, 24, 34, 68, 60, 01, 00, 00, 50, 53, 68, 30, 9C, 42, 00, FF, 15, 58, 71, 40, 00, 68, 54, 91, 40, 00, 68, 80, 2E, 44, 00, E8, A4, 28, 00, 00, FF, 15, AC, 70, 40, 00, BF, 00, F0, 46, 00, 50, 57, E8, 92, 28, 00, 00...
 
[+]

Entropy:
7.9812

Packer / compiler:
Nullsoft install system v2.x

Code size:
22.5 KB (23,040 bytes)

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

http://install-cdn.cytiweb.net/sd?is=ob

The executing file has been seen to make the following network communications in live environments.

TCP (HTTP):
Connects to wac.edgecastcdn.net  (72.21.81.13:80)

TCP (HTTP):
Connects to service.yontoo.com  (8.25.35.148:80)

TCP (HTTP):
Connects to api.yontoo.com  (8.25.35.15:80)

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