Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 08f5e5843247cac5…

MALICIOUS

Office (OOXML)

10.3 KB
MD5: dd314c86111a19d7b13f5c99b3dea915 SHA-1: 3d9b719cb00dfcc9edd6f54d3541ddee6899b80a SHA-256: 08f5e5843247cac5d42038b66a5f0fd20e55cd497edc8a64fc89eb1d7911130f
200 Risk Score

Malware Insights

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

The OOXML document contains a VBA project with an Auto_Open macro, indicating it's designed to execute automatically upon opening. The script uses ShellExecuteA to run a command, and critical heuristics indicate that 'powershell' was reassembled from split string literals. This suggests the macro's primary purpose is to launch a PowerShell process, likely to download and execute a secondary payload, which is a common technique for malware delivery.

Heuristics 5

  • 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.
  • VBA project part renamed to evade filename detection high OOXML_VBA_PROJECT_RENAMED
    The VBA project is bound through the OOXML relationship/content type but its part is not named vbaProject.bin. Legitimate Office producers always emit vbaProject.bin; renaming it hides the macros from path-only scanners (observed in the SVCReady loader).
  • 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 (project part renamed away from vbaProject.bin: ppt/asdasodk.b)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7b6d01e9e602111d2bba5a8b08715da1e6b3c6371495962b714fd5efa3ac2188		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2437 bytes
vbaProject_00.bin
554cffa8e47fedfc1fe09effd81ee84d8e5db1f6bb64c9cd58f44c4f455a3be8		 vba-project OOXML VBA project: ppt/asdasodk.b 23040 bytes

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