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

Static analysis result for SHA-256 7fcbe29b97aabb78…

MALICIOUS

Office (OLE) / .PPT

79.0 KB Created: 2022-01-20 11:50:15 Authoring application: Microsoft Office PowerPoint
MD5: 8c46f3414e18794ecc92486bb5c0f66f SHA-1: bb7fffd4ba1967cabc0bca77b05b9c49463e01c1 SHA-256: 7fcbe29b97aabb785680812a692ae177ab0a030e5e47fce2ed0ced4caca45e99
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample contains VBA macros, specifically an Auto_Close macro that calls a function named 'janwar'. The 'janwar' function appears to construct a string, though its exact value is obfuscated and not fully reconstructible from the provided snippet. However, the Auto_Close macro ultimately calls the Shell() API via the 'uganda' subroutine, which in turn calls 'janwar'. This indicates the macro's intent is to execute an arbitrary command, likely a downloader for a second-stage payload. The presence of ShellExecute API references further supports this.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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 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
062f04863784b261d682098e0800d6cba785aead3ed7db3143ad188e09ad3de5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1875 bytes

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