winrar_setup.exe

DownloadShield

The application winrar_setup.exe by DownloadShield 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 NSIS (Nullsoft Scriptable Install System) installer. The file has been seen being downloaded from www.os-downloads.com and multiple other hosts. While running, it connects to the Internet address ps533545.dreamhost.com on port 443.
Publisher:
DownloadShield  (signed and verified)

MD5:
47ccba63114697c1c0c0d0529f97c2c0

SHA-1:
13755acbae6280e03dde099ec0cb9ca8f314cfa2

SHA-256:
5426102f732e9d56422cbd50803ec5220e6a676976f63e68b4d899e831ca99ad

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.

Analysis date:
6/22/2018 11:50:03 PM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP (M)
17.1.29.7

File size:
260.4 KB (266,664 bytes)

File type:
Executable application (Win32 EXE)

Installer:
NSIS (Nullsoft Scriptable Install System)

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

Digital Signature
Signed by:

Authority:
VeriSign, Inc.

Valid from:
12/21/2015 4:00:00 PM

Valid to:
3/21/2019 4:59:59 PM

Subject:
CN=DownloadShield, O=DownloadShield, L=San Jose, 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:
78070F8D972292519C0C15749BCB3808

File PE Metadata
Compilation timestamp:
8/3/2015 7:43:56 PM

OS version:
5.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
9.0

Entry address:
0x31FD

Entry point:
81, EC, 80, 01, 00, 00, 53, 55, 56, 57, 33, DB, 68, 01, 80, 00, 00, 89, 5C, 24, 1C, C7, 44, 24, 14, F0, 73, 40, 00, 33, F6, C6, 44, 24, 18, 20, FF, 15, B4, 70, 40, 00, FF, 15, B0, 70, 40, 00, 66, 83, F8, 06, 74, 11, 53, E8, F3, 26, 00, 00, 3B, C3, 74, 07, 68, 00, 0C, 00, 00, FF, D0, 68, E8, 73, 40, 00, E8, 74, 26, 00, 00, 68, E0, 73, 40, 00, E8, 6A, 26, 00, 00, 68, D4, 73, 40, 00, E8, 60, 26, 00, 00, 6A, 0D, E8, C3, 26, 00, 00, 6A, 0B, E8, BC, 26, 00, 00, A3, 00, 3C, 42, 00, FF, 15, 34, 70, 40, 00, 53, FF...
 
[+]

Entropy:
7.3262

Packer / compiler:
Nullsoft install system v2.x

Code size:
23 KB (23,552 bytes)

The file winrar_setup.exe has been seen being distributed by the following 2 URLs.

http://www.os-downloads.com/.../WinRAR_Setup.exe

http://www.os-downloads.com/.../downloadarc.php

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

TCP (HTTP SSL):
Connects to ps533545.dreamhost.com  (64.111.117.81:443)

TCP (HTTP):
Connects to server-54-192-55-190.jfk6.r.cloudfront.net  (54.192.55.190:80)

TCP (HTTP):
Connects to server-52-85-112-197.ind6.r.cloudfront.net  (52.85.112.197:80)

TCP (HTTP):
Connects to server-52-85-112-160.ind6.r.cloudfront.net  (52.85.112.160:80)

TCP (HTTP):
Connects to server-52-85-112-119.ind6.r.cloudfront.net  (52.85.112.119:80)

TCP (HTTP):
Connects to server-52-84-63-231.ord51.r.cloudfront.net  (52.84.63.231:80)

TCP (HTTP):
Connects to p3nlhg686c1686.shr.prod.phx3.secureserver.net  (50.62.103.1:80)

TCP (HTTP):
Connects to host-69-144-72-234.msl-mt.client.bresnan.net  (69.144.72.234:80)

TCP (HTTP):

TCP (HTTP):

TCP (HTTP):
Connects to server-54-230-141-27.sfo5.r.cloudfront.net  (54.230.141.27:80)

TCP (HTTP):
Connects to server-54-192-55-7.jfk6.r.cloudfront.net  (54.192.55.7:80)

TCP (HTTP):
Connects to server-54-192-55-251.jfk6.r.cloudfront.net  (54.192.55.251:80)

TCP (HTTP):
Connects to server-54-192-55-232.jfk6.r.cloudfront.net  (54.192.55.232:80)

TCP (HTTP):
Connects to server-54-192-55-216.jfk6.r.cloudfront.net  (54.192.55.216:80)

TCP (HTTP):
Connects to server-54-192-55-158.jfk6.r.cloudfront.net  (54.192.55.158:80)

TCP (HTTP):
Connects to server-54-192-55-104.jfk6.r.cloudfront.net  (54.192.55.104:80)

TCP (HTTP):
Connects to server-54-192-36-98.jfk1.r.cloudfront.net  (54.192.36.98:80)

TCP (HTTP):
Connects to server-54-192-36-224.jfk1.r.cloudfront.net  (54.192.36.224:80)

TCP (HTTP):
Connects to server-54-192-36-20.jfk1.r.cloudfront.net  (54.192.36.20:80)

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