Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a92c81a6d62228f1…

MALICIOUS

Office (OOXML)

6.1 KB
MD5: 2ec3301ac2d1aface63c545e47e2ace0 SHA-1: c92b2e7804a915929b5ae97613e2d2359d0baac3 SHA-256: a92c81a6d62228f1419da355f82a55bb95ccb1b81dc2c2839ec6e36bc22ef86e
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The OOXML document contains a VBA macro with an Auto_open subroutine, which is automatically executed when the document is opened. This macro constructs a URL by concatenating "msh" and "ta ht" with "tps://updatewin32.xyz/office365/msg.txt", resulting in the string "http://updatewin32.xyz/office365/msg.txt". It then uses WMI (Win32_Process.Create) to execute this URL, likely to download and run a second-stage payload. The VBA project part was renamed to evade detection.

Heuristics 6

  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • 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
  • 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.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present (project part renamed away from vbaProject.bin: ppt/RomeOffice2921.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
902f4ffe4a0273eae0c67a01f4278762ae8bfe16ab312e8e86cae85661d61f76		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 262 bytes
vbaProject_00.bin
5cf4a4b190ab264e87d3a03e10b48e2a76c9a55c9f45623ebde2a913071bffc1		 vba-project OOXML VBA project: ppt/RomeOffice2921.bin 12288 bytes

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