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1stbrowser.exe

Installer

SIEN SA

The application 1stbrowser.exe by SIEN SA 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 file has been seen being downloaded from www.softonic.com. While running, it connects to the Internet address www.ibbalance.com on port 443.
Publisher:
S.I.E.N  (signed by SIEN SA)

Product:
Installer

Version:
4.7.2.14

MD5:
f53b8d171af9360a1987156788ab60d3

SHA-1:
568e4c040ba342278c5fa5c9f364568ba485e139

SHA-256:
5666cd863dbcab9e75a2fd8e38a287b348ae712777d039fa54e9ff4ca0af0671

Scanner detections:
1 / 68

Status:
Potentially unwanted

Analysis date:
1/12/2025 9:26:43 PM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Sien (M)
16.8.5.16

File size:
2.4 MB (2,507,880 bytes)

Product version:
4.7.2.14

Copyright:
Copyright (C) 2015

Original file name:
Installer.exe

File type:
Executable application (Win32 EXE)

Language:
English (United States)

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

Digital Signature
Signed by:
SIEN SA

Authority:
GlobalSign nv-sa

Valid from:
9/14/2015 8:05:56 AM

Valid to:
9/14/2016 8:05:56 AM

Subject:
CN=SIEN SA, O=SIEN SA, L=Paris, C=FR

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

Serial number:
11213DB3C4AD369B17F720086E1BBB7BB700

File PE Metadata
Compilation timestamp:
2/9/2016 8:23:25 AM

OS version:
5.1

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
12.0

CTPH (ssdeep):
49152:LThut8MbTgCkmLrLEuHkgIq6boIWnM8fHyPqsFdqagaOsWJsa9O6vES6Xg6:Xwt8MbTjkm7EuHkbq68FHyPqsCagaOsF

Entry address:
0x1354F3

Entry point:
E8, 44, 7B, 01, 00, E9, 7F, FE, FF, FF, 55, 8B, EC, 83, EC, 20, 56, 57, 6A, 08, 59, BE, 74, 0C, 5C, 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, 52, 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...
 
[+]

Entropy:
6.3727

Code size:
1.6 MB (1,653,248 bytes)

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

http://www.softonic.com/sads/tracker.php?ev=c&co=DO&sid=f489d397b2e0ad1ceb9883c778d18ed0&upv=2ae6fedc688fdb1bd74c24adaf2e50c1&z=results&sk=0&abp=0&params=F24F8F4D368AFA5D32C8A90D9EFD1CBABA9D00FFBB6651DF46D4F1DC9B67DA6971303BE7481FF5D6686A3E4C935F0F370F0C563C2ED5E66A9D27E4DA43547D82E1A7BC7E412CD0D0248D98A18758BD196708362CE8BBD94957C8D350272FC33D79A87E3AFBE955657A2F42DAD0D12AF4859DED350462AB65008C3E968B4AE4FE990A9D2DC48763F8BEBEF4B28FCD4505F5C16D9089AD6FEE5F907198A2B15344AD2476E608B37549AB0E291FD96A6B36&h=E80324A6BBC99EC3695C997CCD5B2C956F73906E821BB261B19FE47F1F0B3D13&directdownload=1&f=69711749&d=http://.../1SfX5jL

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)

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