Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 8997317eeb867634…

MALICIOUS

Office (OOXML)

10.3 KB
MD5: b37cbd620e77ebb4e1a88cb203c38916 SHA-1: e00f1e37cc5d48405170712a07b9a526bac88199 SHA-256: 8997317eeb8676345d4efd062e43d5b98d1de861790baa5d43ed9946dbc6174d
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 a renamed part, indicating an attempt to evade detection. The presence of an Auto_Open macro and the reassembly of the 'powershell' keyword from split string literals strongly suggest that the macro is designed to execute a PowerShell command. This command is likely used to download and execute a second-stage payload, 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/aksodaksd.b)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
86711b17f1752e4464f78ac456ae1bc589c81b2da737bf4cb63b577238b08c6f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2436 bytes
vbaProject_00.bin
d1b80ffd6b674d2e9f91b130f185096d91435eaf77a3eba94ade63b6eee8d7fd		 vba-project OOXML VBA project: ppt/aksodaksd.b 23040 bytes

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