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

Static analysis result for SHA-256 d12845d7c2cdfc5b…

MALICIOUS

Office (OLE) / .XLS

32.0 KB Created: 2020-04-16 11:41:43 Authoring application: Microsoft Excel
MD5: eff125f59dffef699e1530e5c6d145d9 SHA-1: b0c329ecc1092cdd7d19929b68b046eff703bb5b SHA-256: d12845d7c2cdfc5bb5abeeca4a3b099dfc9042e12bffcd9b62325e0081b9a835
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1566.002 Spearphishing Attachment

The sample is a malicious Excel file containing VBA macros. The Auto_Close macro is present and uses GetObject, indicating it's designed to execute code upon closing. The presence of a NOP-equivalent sled suggests potential shellcode execution. While no specific family is identified, the techniques point to a macro-based downloader or initial execution vector.

Heuristics 5

  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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.
  • NOP-equivalent sled detected medium SC_NOP_EQUIV_SLED
    Long run of 0x61 bytes
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
31e70a5147395a10c6ad559792227934e58ddbe827f99606be2c42ff411c3df8		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1085 bytes

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