Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0cc01ea8f1d9220f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:36:01 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 93310051d7cd28168f4a4459a9abd9e9 SHA-1: fcc27d70a5f24fedd61bf3b6f0c29c11589b798b SHA-256: 0cc01ea8f1d9220fc640a204920a5e00cb808fc8945351a485ff7682eaaf54c7
140 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 (XLM) macros, specifically an Auto_Open macro. This technique is often used to execute arbitrary code upon opening the document, typically to download and run a second-stage payload. The presence of dangerous formula APIs in the Auto_Open macro further indicates malicious intent.

Heuristics 3

  • 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.
  • 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.

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) 6686 bytes
SHA-256: 6a08b380bb42b57575da5e9c516dec716e33c3eefda8d3f142bf2699f9838af9
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  bWkhCouBRMX
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C178 
' 0018     20 LABEL : Cell Value, String Constant - DaxEk len=0 
' 0018     23 LABEL : Cell Value, String Constant - FWuEjxvW len=0 
' 0018     24 LABEL : Cell Value, String Constant - FzuSbsJyq len=0 
' 0018     24 LABEL : Cell Value, String Constant - hJuGAgiGM len=0 
' 0018     26 LABEL : Cell Value, String Constant - JTRRTNNbWLs len=0 
' 0018     25 LABEL : Cell Value, String Constant - KtzUWKFXVB len=0 
' 0018     27 LABEL : Cell Value, String Constant - lHoiaEOQnmyc len=0 
' 0018     22 LABEL : Cell Value, String Constant - LIbWVnh len=0 
' 0018     26 LABEL : Cell Value, String Constant - ocbFKRnYdyS len=0 
' 0018     27 LABEL : Cell Value, String Constant - OwWpqONGApYk len=0 
' 0018     27 LABEL : Cell Value, String Constant - pKmdMcHoOsXZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - RvrvZPlo len=0 
' 0018     24 LABEL : Cell Value, String Constant - sdmTKcxRQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - smxtZepe len=0 
' 0018     23 LABEL : Cell Value, String Constant - TLwmBpdb len=0 
' 0018     26 LABEL : Cell Value, String Constant - UkHbMLQDvcR len=0 
' 0018     22 LABEL : Cell Value, String Constant - uMfWmdm len=0 
' 0018     24 LABEL : Cell Value, String Constant - uuUhXFSss len=0 
' 0018     23 LABEL : Cell Value, String Constant - uycmzSFy len=0 
' 0018     21 LABEL : Cell Value, String Constant - xVzrxz len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/
... (truncated)

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