Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 66adebd7487a0c7f…

MALICIOUS

Office (OLE)

191.5 KB Created: 2020-07-14 04:14:49 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: f7437c94fe161c5c42e1e7317da1cba7 SHA-1: 6330c0b36ccb33266ef2bb775e4fa2ec8ffc72c5 SHA-256: 66adebd7487a0c7f65ed8f9e2b47599f947a7725ec96019eb53c1433b305f85f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains Excel 4.0 (XLM) macros, including an Auto_Open defined name, which are configured to execute automatically upon opening. Heuristics indicate the use of dangerous formula APIs and environment evasion techniques, suggesting the macros are designed to bypass security measures and launch a malicious payload. The presence of a macro-enable lure further supports this malicious intent.

Heuristics 5

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • XLM Auto_Open environment-evasion close gate critical OLE_XLM_ENVIRONMENT_EVASION_CLOSE
    Excel 4.0 macro sheet auto-executes environment checks with GET.WORKSPACE / GET.WINDOW, then shows a fake corruption/error message and closes the workbook when the host fails those checks. This is a malware sandbox-evasion pattern, even when the later payload stage is hidden behind obfuscated defined-name flow.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 68429 bytes
SHA-256: ab5d1e88ad5074d01ea2ce5a2458a638643086c348c68048b6a6ed20d7cd1426
Preview script
First 1,000 lines of the extracted script
' 0085     10 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  v
' 0085     22 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  VJHBTQmJhnjux
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet1
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet1
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet1
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet1
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet1
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet1
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet1
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet1
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet1
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet1
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet2
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet2
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet2
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet2
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet2
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet2
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet2
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet2
' 0085     15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet2
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     22 LABEL : Cell Value, String Constant - aHkBhnH len=0 
' 0018     64 LABEL : Cell Value, String Constant - aHPQOTExFivuLPSJixqaIKfIMakFTGsTpoRxQCGfGRLdawTrj len=0 
' 0018     64 LABEL : Cell Value, String Constant - aoyhhUUvERsMrQhtifZroLuGMITklHISpWzQvDWeTyuusxjcj len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  v!DZ20620 
' 0018     21 LABEL : Cell Value, String Constant - aXtPot len=0 
' 0018     22 LABEL : Cell Value, String Constant - azPHrZb len=0 
' 0018     24 LABEL : Cell Value, String Constant - bMtvQsxMW len=0 
' 0018     17 LABEL : Cell Value, String Constant - BN len=0 
' 0018     25 LABEL : Cell Value, String Constant - BPZtIuhIed len=0 
' 0018     31 LABEL : Cell Value, String Constant - bXjBPXYhFzdfMSlt len=0 
' 0018     21 LABEL : Cell Value, String Constant - cCeKHp len=0 
' 0018     49 LABEL : Cell Value, String Constant - cCRJtbdybftEYmZMmJIkRiVZyZkewtQmLD len=0 
' 0018     21 LABEL : Cell Value, String Constant - Cdcsil len=0 
' 0018     43 LABEL : Cell Value, String Constant - cdyzKhOrHnuNVLqlmkpaUbFgRhlo len=0 
' 0018     32 LABEL : Cell Value, String Constant - CjlGinBMgthTuRQrZ len=0 
' 0018     60 LABEL : Cell Value, String Constant - ClhWqgXlveeREeBOcKbNRqfcWolIeDJFQUiEGPYTwNfzT len=0 
' 0018     38 LABEL : Cell Value, String Constant - coRkQoGSGExQNjTekgrJKfg len=0 
' 0018     23 LABEL : Cell Value, String Constant - CPOeikcC len=0 
' 0018     53 LABE
... (truncated)