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Run_b7a4b.exe Trojan Downloader Analysis

Updated 29 days ago
Checked by Malaware Check
run_b7a4b.exe

Technical Analysis

File Name run_b7a4b.exe
File Type
PE32 executable (GUI) Intel 80386, for MS Windows, Nullsoft Installer self-extracting archive
Scanner Version 1.0.216.174
Database Version 2025-05-07 16:00:18 UTC
⚠

Trojan.Win32.Downloader.sa

Malware family: Downloader

Downloader Trojans specialize in retrieving and installing additional malware payloads. Unlike comprehensive malware, they focus specifically on payload delivery rather than direct system damage.
N/A
Detection Rate
318,312
File Size (bytes)
2025-05-07
Analysis Date

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File Identification

Hash Type Value Action
MD5
d245587d93bf339a77952f916f722975
SHA1
8fbfb304a995b321a7de476b26f61191ee57d3d2
SHA256
8d1ae28f86c2381035101c82140a14bcf973689a16b3c81467a0ba17829e601c
SHA512
dd28aa55296e286bd8bc6d81ea57cb02d4c691b0132e69b068125fbd26b1dfd75b1d818889f81de18c578aef303827aa27112f727eb6e2bc2ed4968231cacfbd
ImpHash
9dda1a1d1f8a1d13ae0297b47046b26e

PE Analysis

Basic Information

▼
Icon
Hash: ededff98662a85c64089ca7bf8a7f906
Fuzzy: 06d127e552b00921f96d8446e5a454bb
dHash: 71c08cf8d8dcc870
Image Base 0x00400000
Entry Point 0x00403645
Compilation Time 2023-07-02 02:09:43
Checksum 0x00000000 (Actual: 0x0004e3ae)
OS Version 4.0
PEiD Signatures PE32 executable (GUI) Intel 80386, for MS Windows, Nullsoft Installer self-extracting archive
Digital Signature No valid SignedData structure was found.
Imports 7 libraries
ADVAPI32, SHELL32, ole32, COMCTL32, USER32, GDI32, KERNEL32
Exports 0 functions
Resources 12 Resources
Sections 5 Sections

PE Sections

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Name Virtual Address Virtual Size Raw Size Entropy Characteristics MD5
.text 0x00001000 26,295 bytes 26,624 bytes 6.44 (Normal) IMAGE_SCN_CNT_CODE|IMAGE_SCN_MEM_EXECUTE|IMAGE_SCN_MEM_READ E65344AC983813901119E185754EC24E
.rdata 0x00008000 4,952 bytes 5,120 bytes 5.10 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ BD82D08A08DA8783923A22B467699302
.data 0x0000a000 129,912 bytes 1,536 bytes 4.13 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE CAA377D001CFC3215A3EDFF6D7702132
.ndata 0x0002a000 135,168 bytes 0 bytes 0.00 (Normal) IMAGE_SCN_CNT_UNINITIALIZED_DATA|IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE D41D8CD98F00B204E9800998ECF8427E
.rsrc 0x0004b000 16,656 bytes 16,896 bytes 6.01 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ 17BEE68DED6EDD5BFBC94E2BA3EF1298

Resource Analysis

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Total Resources: 12 (15,958 bytes)
Resource Type Count Total Size Percentage
RT_ICON 7 13,784 bytes
86.4%
RT_DIALOG 3 1,000 bytes
6.3%
RT_GROUP_ICON 1 104 bytes
0.7%
RT_MANIFEST 1 1,070 bytes
6.7%

Certificate Chain Analysis

▼
No Digital Signatures

This file is not digitally signed.

Security Implications:
  • Cannot verify the publisher's identity
  • Increased security risk when running this file
  • May trigger security warnings on some systems

⚠ This file either lacks a digital signature or the certificate chain could not be verified
Exercise caution when executing unsigned files from unknown sources

Certificate Verification Status

No valid SignedData structure was found.

Recommendation: Verify the file source and ensure it comes from a trusted publisher.

Trojan.Win32.Downloader.sa Removal

Gridinsoft has the capability to identify and eliminate Trojan.Win32.Downloader.sa without requiring further user intervention.

Download Anti-Malware

Removal Instructions

Follow these steps to completely remove the threat from your system

  1. Start by downloading Gridinsoft Anti-Malware to your computer.
  2. Double-click on the gsam-en-install.exe file and follow the on-screen instructions to install the program.
  3. Once the installation of Gridinsoft Anti-Malware is complete, the program will open on the Scan screen.
  4. Click on the "Standard Scan" button to begin scanning your computer for threats.
  5. After the scanning process is finished, click on "Clean Now" to remove any detected threats.
  6. If prompted, restart your system to complete the removal process and ensure all threats are eliminated.
Important: Before You Start
Disconnect from the internet to prevent the malware from spreading or downloading additional threats. Run the scan in Safe Mode for better detection and removal of persistent threats.

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