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openkeyword_update.exe

Maroin Co., Ltd

The application openkeyword_update.exe by Maroin Co. 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. It is also typically executed from an Internet Explorer cache folder. The file has been seen being downloaded from sub.openkeyword.co.kr.
Publisher:
Maroin Co., Ltd  (signed and verified)

MD5:
8b6e9a354bf4555a38d3b17b3bc27d4b

SHA-1:
e429175b6e5ed5b147398aa1ea626f9f56bef8e0

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:
5/6/2024 1:03:14 PM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.MaroinCo.Installer (M)
16.4.10.12

File size:
2.6 MB (2,740,496 bytes)

File type:
Executable application (Win32 EXE)

Installer:
NSIS (Nullsoft Scriptable Install System)

Common path:
C:\Documents and Settings\{user}\Local settings\temporary internet files\content.ie5\{random}\openkeyword_update.exe

Digital Signature
Signed by:
Maroin Co., Ltd

Authority:
thawte, Inc.

Valid from:
12/1/2015 9:00:00 AM

Valid to:
3/2/2018 8:59:59 AM

Subject:
CN="Maroin Co., Ltd", O="Maroin Co., Ltd", L=Suyeong-gu, S=Busan, C=KR

Issuer:
CN=thawte SHA256 Code Signing CA, O="thawte, Inc.", C=US

Serial number:
6247B0D6AE6DA842E9AFD19046D234EF

File PE Metadata
Compilation timestamp:
12/6/2009 7:50:41 AM

OS version:
4.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
6.0

CTPH (ssdeep):
49152:O3ZbxBNXiO+3mq2SKcw6B2y28rn8r6B4Fwh9bwe+ZWA6cfV:qZbxTD+2Cm6oJ8YGh9bV+ZWAzV

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, 3F, 42, 00, E8, F1, 2B, 00, 00, A3, 84, 3E, 42, 00, 53, 8D, 44, 24, 34, 68, 60, 01, 00, 00, 50, 53, 68, 30, F4, 41, 00, FF, 15, 58, 71, 40, 00, 68, 54, 91, 40, 00, 68, 80, 36, 42, 00, E8, A4, 28, 00, 00, FF, 15, AC, 70, 40, 00, BF, 00, 90, 42, 00, 50, 57, E8, 92, 28, 00, 00...
 
[+]

Entropy:
7.9981

Packer / compiler:
Nullsoft install system v2.x

Code size:
22.5 KB (23,040 bytes)

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

http://sub.openkeyword.co.kr/opapp/bogo1/app/.../openkeyword_update.exe

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