SHA1:
- 9d80905df226b13e9fa252a0b58c575cb238689a
A malicious program downloaded by Trojan.LoadMoney.3209. It is not packed and has a valid digital signature. The primary part of the Trojan’s body consists of an encrypted cURL utility. The body also contains a library necessary for SQLite database operation, the file that is saved to the disk, and the code of the downloader itself.
The Trojan parses the command line with regular expressions. If the command line parameters are missing the Trojan attempts to read them from the %filename%:args or %filename%.args files.
Once the command line is parsed and the Trojan is initialized, the Trojan checks whether the SvcHost Service Host service has been launched. If the service has not been launched the Trojan checks for administrative privileges. If privileges are not granted the Trojan runs itself using runas. It extracts the cURL utility and saves it as the %APPDATA%\wget\wget_1_19_4.exe file. Via the Windows Task Scheduler the Trojan configures the downloading process using the cURL executable file that is saved as %APPDATA%\wget\wget.exe. The Trojan also sets the launch of this file in the Windows Task Scheduler.
The Trojan contains 3 encrypted URLs that are used to download the executable file at the time of the research. This file is saved to %TEMP% and launched with the command line parameters:
-url=http://m****y.ru/s/?mid=$__MID&utmd=$__UTMD&itmd=$__ITMD&utm=p_14980_&action= --temporary=http://ybw***klpi.chi****ce.ru/software_install?sid=14980&sub_id=&hash=9d80905df226b13e9fa252a0b58c575cb238689a9d80905df226b13e9fa252a0&mid=$__MID&gimli_=1&fname=<SAMPLE.EXE> --sha256=d34eec80dd87819743e4f80a69796f1793bbcf74d34eec80dd87819743e4f80a
In this string all data except hash and sha256 is constant and stored in the Trojan. After the downloaded file is launched, the Trojan writes the launch time as a unix timestamp in the Run parameter of the key register [HKLM\SOFTWARE\Microsoft\Windows]. The Trojan then deletes the original file.
After downloading, the Trojan extracts the MZPE file without the first two bytes, restores its header, and saves the file to %TEMP%. Trojan.Siggen7.35395 was saved in the examined sample. Trojan.Siggen7.35395 is a file with SHA1: 92ed6dac6a2ac73bc49d65c868dc5bf15ad38ff7. This file is launched with the command line parameters:
--chn="p_14980" --install-cert --dns="34.***.***.26;77.***.***.138"
The Trojan collects information about the infected computer and sends it to cybercriminals’ servers. Finally, it deletes itself either using MoveFileEx or a .bat file.
