Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 414e453bef3ef237…

MALICIOUS

Office (OOXML)

382.6 KB Created: 2021-02-15 19:29:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-04-01
MD5: c0a1feefd52971133a906720f8cab689 SHA-1: 4852d342725318f4b746cc4fe476f8871c62bd25 SHA-256: 414e453bef3ef2374dd129dc7f60d3b43e08d505010873b4147accf28dd2ed2b
100 Risk Score

Heuristics 3

  • NOP sled detected high SC_NOP_SLED
    Found 20+ consecutive 0x90 bytes
    Disassembly hidden — these bytes score as degenerate, not coherent x86 code (single mnemonic 'nop' is 78% of instructions — a sled or padding/filler run, not program logic).
  • VBA project inside OOXML medium 1 related finding OOXML_VBA
    Document contains a VBA project — VBA macros present
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Triggers on the COMBINATION of two tokens co-occurring in the same compiled VBA/cache stream: an auto-execution entry point (Auto_Open / AutoOpen / Document_Open / Workbook_Open / Auto_Close / AutoClose) AND a shell/download/object-execution token (Shell, CreateObject, GetObject, PowerShell, cmd.exe, URLDownloadToFile, WinHttp, XMLHTTP, ADODB.Stream, ShellExecute, ExecuteExcel4Macro). Neither token alone fires it — it is the pairing that flags p-code-only or source-extraction-failure macro documents where the visible VBA source is unavailable. The matched tokens are named in the detail line below.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 900 bytes
SHA-256: 8acdb8dc834ddee2d36ddc2aa6de4510d3b545b2d6a1ebd31c70b77e83fcf0f6
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Sheet1"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet2"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet3"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 15872 bytes
SHA-256: ecd030fa23dcca51cdc3438e491c3e8f66545381dca0600f0cd4faa3534781a1

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