Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 289fd8d06a0809ac…

MALICIOUS

Office (OOXML) / .XLSM

384.3 KB Created: 2021-02-15 19:29:50 UTC Authoring application: Microsoft Excel 16.0300
MD5: 109177afb0904ec548f459fdfde1a928 SHA-1: f5b73b1d34fc08f695ed4be8b15a33a12dddcc9a SHA-256: 289fd8d06a0809ace139201a7bd5896eecc684f0887e791f307e47bbfa5698e4
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.002 Spearphishing Attachment

The OOXML file contains VBA macros, specifically a Workbook_Open macro, which is a common technique for initial execution. The presence of a NOP sled and a GetObject call suggests the macro is designed to deobfuscate and execute a payload. Without further analysis of the macro's content, the exact payload and delivery mechanism remain unknown, but the intent is clearly malicious execution.

Heuristics 4

  • NOP sled detected high SC_NOP_SLED
    Found 20+ consecutive 0x90 bytes
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
a67cda4bb3b2917fa32916df3a17d36928f939c2eaa718f93435bb57af487449		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3175 bytes
vbaProject_00.bin
62ef121cf2d304b457b69cb797d85d8002671b87ba12afc890c8d87b6414b73a		 vba-project OOXML VBA project: xl/vbaProject.bin 15872 bytes

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