Gozi — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 104763a142c5730f…

MALICIOUS

Office (OLE) / .XLS

80.5 KB Created: 2023-03-01 08:08:48 First seen: 2023-03-01
MD5: 0c960307b8659514ecc0bbd918601217 SHA-1: bbec96a3fc89745befbab1c9bf6b9bba65be8fb3 SHA-256: 104763a142c5730f2e27244181e40447d194545ffa327c75e8c727ba28cea425
308 Risk Score

Malware Insights

Gozi · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059.003 Windows Command Shell

The file contains VBA macros that utilize the URLDownloadToFileA API to download a payload. The ClamAV detection name 'Doc.Downloader.Gozi-10026044-0' strongly suggests the Gozi family. The script also uses Shell() and CreateObject() calls, indicating it's designed to execute downloaded content.

Heuristics 7

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • ClamAV: Doc.Downloader.Gozi-10026044-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Gozi-10026044-0
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
4c7572de851289c973f50a5407527f4227f9277601a789085a229d4f1bd9f7d6		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2726 bytes

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