Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8eceeae7476ffda0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:48 Authoring application: Microsoft Excel First seen: 2021-06-17
MD5: ab4478184ccfefd3c34cdcf74468e959 SHA-1: 1845090ba3c49cf2d9ade42eed20892c4e875996 SHA-256: 8eceeae7476ffda0baef5acb98413cd6c2ad880d3c4a9e5f6001412442b19246
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. While no specific URLs or hashes were extracted, the mechanism itself is highly suspicious and indicative of a downloader or initial execution stage.

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) 6800 bytes
SHA-256: c9075e263085830a3e855b9b90eeffeabc60f82ea034385b84ea35ba5da17e37
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  OyMrsJGWu
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F138 
' 0018     22 LABEL : Cell Value, String Constant - cbjzIWl len=0 
' 0018     27 LABEL : Cell Value, String Constant - DiZNguKanbza len=0 
' 0018     21 LABEL : Cell Value, String Constant - eDAhCe len=0 
' 0018     23 LABEL : Cell Value, String Constant - eieMMhJj len=0 
' 0018     24 LABEL : Cell Value, String Constant - fjyGEuFxr len=0 
' 0018     21 LABEL : Cell Value, String Constant - FMgWsb len=0 
' 0018     21 LABEL : Cell Value, String Constant - GHktEo len=0 
' 0018     24 LABEL : Cell Value, String Constant - gigKjyZwY len=0 
' 0018     25 LABEL : Cell Value, String Constant - nodQYlaTKN len=0 
' 0018     26 LABEL : Cell Value, String Constant - pVODvgYYVvm len=0 
' 0018     25 LABEL : Cell Value, String Constant - pxumundTbs len=0 
' 0018     22 LABEL : Cell Value, String Constant - QCNOpwK len=0 
' 0018     24 LABEL : Cell Value, String Constant - TWxSZhgsj len=0 
' 0018     22 LABEL : Cell Value, String Constant - uJAWyiF len=0 
' 0018     25 LABEL : Cell Value, String Constant - UjBjEWOMTj len=0 
' 0018     27 LABEL : Cell Value, String Constant - ushSZnWFdcqv len=0 
' 0018     25 LABEL : Cell Value, String Constant - WljVGFrDzR len=0 
' 0018     24 LABEL : Cell Value, String Constant - wQEYvPnyq len=0 
' 0018     25 LABEL : Cell Value, String Constant - yOzroCCBwz len=0 
' 0018     26 LABEL : Cell Value, String Constant - ysFmqoPAiWs 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/ SS
... (truncated)

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