Doc.Downloader.Gozi-10026044-0 — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 bf4dc131cb62c229…

MALICIOUS

Office (OLE) / .XLS

51.0 KB Created: 2023-03-01 08:21:47 Authoring application: Microsoft Excel First seen: 2023-03-01
MD5: f5fe1eab542485af03291d184511c0b9 SHA-1: 58c11779b1939c00067ee46a534782f4a1c7786a SHA-256: bf4dc131cb62c2295f223d23bde7503e9643010960390b10c8a46c8380b7d045
308 Risk Score

Malware Insights

Doc.Downloader.Gozi-10026044-0 · confidence 95%

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

The sample is an Excel document containing VBA macros that utilize the URLDownloadToFile API to download a second-stage payload. The script also uses CreateObject to instantiate MsXMl2.xMlhTTp and makes a Shell() call, indicating it's designed to fetch and execute further malicious content. The ClamAV detection name further supports the downloader functionality.

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
f7f98bce7751546bc82f2ff67fe317a27114596f2b10c50cd20ec2e955db7a44		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2713 bytes

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