Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 7a585a723b4883d4…

MALICIOUS

Office (OLE) / .XLS

24.0 KB
MD5: 9c721bdc42ca1330fab207085df94ac7 SHA-1: f3337526c7f5a9fc1310e4e639ddfe47d060ba5a SHA-256: 7a585a723b4883d445d9b712af539cd11ad6d0be4244c04ba672c162b9016ea6
370 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The Workbook_Open macro executes a Shell() command via WScript.Shell to download a file from a Dropbox URL. The downloaded file is likely a second-stage payload, as indicated by the 'OLE_VBA_HTTP_DROP_EXEC' heuristic. The macro also attempts to disable VBA warnings in Excel and Word, suggesting an effort to evade detection.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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)
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.dropbox.com/s/zhp1b06imehwylq/Synaptics.rar?dl=1�
    • https://www.dropbox.com/s/zhp1b06imehwylq/Synaptics.rar?dl=1
    • https://docs.google.com/uc?id=0BxsMXGfPIZfSVzUyaHFYVkQxeFk&export=download�
    • https://docs.google.com/uc?id=0BxsMXGfPIZfSVzUyaHFYVkQxeFk&export=download

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
097df6c2bdbc35d07b910238db6efd78ab430d35500c93dc5ef97f914c06936b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 20876 bytes

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