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1stbrowser.exe

Installer

SIEN S.A.

This is the SIEN AppScion Installer which bundles applications with offers for additional 3rd party software, mostly unwanted adware, and may be installed with minimal consent. The application 1stbrowser.exe by SIEN S.A has been detected as a potentially unwanted program 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 SIEN SuperInstall installer. The file has been seen being downloaded from up.br.bav.baidu.com. While running, it connects to the Internet address www.ibbalance.com on port 443.
Publisher:
S.I.E.N.  (signed by SIEN S.A.)

Product:
Installer

Version:
1.36.4.15

MD5:
8bc9e2e054e49033bf5eb95b65389803

SHA-1:
951f54862da6baa1f8ecc54297ae0cdbd0bc0c3a

SHA-256:
8bfc2c9389e03020600cbd9ef4f3934ff01a40818490548e90fbd8e2419d883d

Scanner detections:
1 / 68

Status:
Potentially unwanted

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:
11/23/2024 10:53:52 AM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Sien.SIENSA.Bundler (M)
16.6.29.20

File size:
2.4 MB (2,503,272 bytes)

Product version:
1.36.4.15

Copyright:
Copyright (C) 2015

Original file name:
Installer.exe

File type:
Executable application (Win32 EXE)

Bundler/Installer:
SIEN SuperInstall

Language:
English (United States)

Common path:
C:\users\{user}\downloads\1stbrowser.exe

Digital Signature
Signed by:
SIEN S.A.

Authority:
GlobalSign nv-sa

Valid from:
6/15/2015 11:50:10 AM

Valid to:
6/15/2016 11:50:10 AM

Subject:
CN=SIEN S.A., O=SIEN S.A., L=Paris, C=FR

Issuer:
CN=GlobalSign CodeSigning CA - SHA256 - G2, O=GlobalSign nv-sa, C=BE

Serial number:
1121D1DF1CB73206967A3311ED8724668997

File PE Metadata
Compilation timestamp:
1/19/2016 7:18:10 AM

OS version:
5.1

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
12.0

CTPH (ssdeep):
49152:KJ9crfmf+0xe35c8E5OEz+wc49pOVbsWlAZPCNqcVrh7O6DNJ2:Kjcrfm20A5c8EUEXXOVbsYAZPCNRm

Entry address:
0x14BD03

Entry point:
E8, 33, 7B, 01, 00, E9, 7F, FE, FF, FF, 55, 8B, EC, 83, EC, 20, 56, 57, 6A, 08, 59, BE, 74, FC, 5B, 00, 8D, 7D, E0, F3, A5, 8B, 75, 0C, 8B, 7D, 08, 85, F6, 74, 13, F6, 06, 10, 74, 0E, 8B, 0F, 83, E9, 04, 51, 8B, 01, 8B, 70, 18, FF, 50, 20, 89, 7D, F8, 89, 75, FC, 85, F6, 74, 0C, F6, 06, 08, 74, 07, C7, 45, F4, 00, 40, 99, 01, 8D, 45, F4, 50, FF, 75, F0, FF, 75, E4, FF, 75, E0, FF, 15, C4, 42, 59, 00, 5F, 5E, 8B, E5, 5D, C2, 08, 00, 8B, 4D, F4, 64, 89, 0D, 00, 00, 00, 00, 59, 5F, 5F, 5E, 5B, 8B, E5, 5D, 51...
 
[+]

Code size:
1.6 MB (1,649,152 bytes)

The file 1stbrowser.exe has been seen being distributed by the following URL.

http://up.br.bav.baidu.com/?rh=42ACCFA8FC6AE56EF7177A4696DD10D8&baidusign=26170333&baidurand=27843

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

TCP (HTTP):
Connects to www.softologic.com  (174.37.181.31:80)

TCP (HTTP SSL):
Connects to www.ibbalance.com  (173.192.190.227:443)

TCP (HTTP):
Connects to stats-182385724-1591972470.us-east-1.elb.amazonaws.com  (54.221.252.69:80)

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