Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 82cad534022c02ac…

MALICIOUS

Office (OOXML)

7.5 KB
MD5: 777c71b1445f14f747482471b8793c1b SHA-1: e26fbdbd5b18602997f67d21fe514993778f5dca SHA-256: 82cad534022c02acf4c087bc8b65d2e4d1e2012f07c71815ed237a919e3c920c
168 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains a VBA macro with an Auto_open subroutine that utilizes the URLDownloadToFileA API. This function is used to download a second-stage payload from the reconstructed URL "http://updatewin32.xyz/3.txt" and save it as "msi.ps1" in the user's public directory. The presence of the Auto_open macro and the use of URLDownloadToFileA strongly indicate a downloader functionality.

Heuristics 5

  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
4de38e0dea0d584692d3476d04db413c90de6ffbcd0153969e664312026e7c2b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 401 bytes
vbaProject_00.bin
6ca1e1e69ea45a924b3474cc1256a262f2e6bff63c1cbb9a08d78a262a483141		 vba-project OOXML VBA project: ppt/vbaProject.bin 16384 bytes

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