Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 64c0bcded14a725f…

MALICIOUS

Office (OLE)

305.5 KB Created: 2020-10-14 10:03:18
MD5: c3a167c3d8ff58192e709c92c953afff SHA-1: bc1121346bf19503f2d7db1487d802dbe6ec7eb5 SHA-256: 64c0bcded14a725f297ca98db0acbf1e9cca2ac310d8140a427faaf862aef42e
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1566.001 Spearphishing Attachment

The sample contains an obfuscated VBA loader within a Workbook_Open macro. This macro executes a PowerShell command that downloads a second-stage executable from 'http://weeshoppi.com/wp-includes/ID3/z/51037.jpg' and then executes it. The PowerShell command is explicitly constructed to bypass execution policy and run hidden.

Heuristics 7

  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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 http://weeshoppi.com/wp-includes/ID3/z/51037.jpg

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
b652ecceafd009197b29899837974dc4c14c811af6ece632a273002d77f3ebc6		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1776 bytes

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