Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 3f809ad689809ad1…

MALICIOUS

Office (OOXML)

12.3 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: 9875b7270267c69318008cef925fa50e SHA-1: dee05bffac47ebc36c38e8519812126186543743 SHA-256: 3f809ad689809ad137aead252f2a2072227df443d7f6c8214dda3ffc51a1fd1d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is a malicious Excel document containing a VBA macro. The macro's auto_open subroutine is designed to execute a PowerShell command by concatenating string literals. This indicates the file is likely a downloader or dropper for a second-stage payload, leveraging the common spearphishing attachment vector.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • 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 project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
d2946322b9cf8b97ee7829ca8100e794e9526593763da97c5fe744249c409249		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 729 bytes
vbaProject_00.bin
baa8f727c65339a3e2569b4aa1c76d913a61223b7e2e22fe75fe10b06cb91b04		 vba-project OOXML VBA project: xl/vbaProject.bin 14336 bytes

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