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isr_lj.exe

Ding Ruan

The application isr_lj.exe by Ding Ruan has been detected as a potentially unwanted program by 1 anti-malware scanner with very strong indications that the file is a potential threat. This is a setup program which is used to install the application. The file has been seen being downloaded from d11m2p9mpffp32.cloudfront.net.
Publisher:
Ding Ruan  (signed and verified)

MD5:
6ea717b554c8cd20f57910e96602b59a

SHA-1:
ff16c95dee00139804a5bf8bf64367c778074590

SHA-256:
939e0c0a3ddf0a4bf4d01221784a010ad5bdad95df765344078a9145e78b63e3

Scanner detections:
1 / 68

Status:
Potentially unwanted

Analysis date:
5/15/2025 10:24:13 AM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.ELEX (M)
16.9.16.11

File size:
467.7 KB (478,920 bytes)

File type:
Executable application (Win32 EXE)

Common path:
C:\Documents and Settings\{user}\Local settings\temp\{random}.tmp\isr_lj.exe

Digital Signature
Signed by:
Ding Ruan

Authority:
thawte, Inc.

Valid from:
9/6/2016 7:00:00 AM

Valid to:
4/14/2017 6:59:59 AM

Subject:
CN=Ding Ruan, OU=Individual Developer, O=No Organization Affiliation, L=Beijing, S=Beijing, C=CN

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

Serial number:
51F503B62BF53BAAC1BB85DC3A763D5F

File PE Metadata
Compilation timestamp:
9/14/2016 2:12:08 PM

OS version:
5.1

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
12.0

CTPH (ssdeep):
12288:qnLPplovy3GPX3O2es9gKrMiGVif4uQWCpWn:q1qq38uLsWiIif4u7CpQ

Entry address:
0x4EF0

Entry point:
E8, 19, 31, 00, 00, E9, 7F, FE, FF, FF, CC, CC, CC, CC, CC, CC, 57, 56, 8B, 74, 24, 10, 8B, 4C, 24, 14, 8B, 7C, 24, 0C, 8B, C1, 8B, D1, 03, C6, 3B, FE, 76, 08, 3B, F8, 0F, 82, 68, 03, 00, 00, 0F, BA, 25, F4, 31, 47, 00, 01, 73, 07, F3, A4, E9, 17, 03, 00, 00, 81, F9, 80, 00, 00, 00, 0F, 82, CE, 01, 00, 00, 8B, C7, 33, C6, A9, 0F, 00, 00, 00, 75, 0E, 0F, BA, 25, 18, 90, 41, 00, 01, 0F, 82, DA, 04, 00, 00, 0F, BA, 25, F4, 31, 47, 00, 00, 0F, 83, A7, 01, 00, 00, F7, C7, 03, 00, 00, 00, 0F, 85, B8, 01, 00, 00...
 
[+]

Entropy:
7.8104  (probably packed)

Code size:
62.5 KB (64,000 bytes)

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

http://d11m2p9mpffp32.cloudfront.net/.../clc_lj.exe

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