Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5b32fd7df9ae0888…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:20 Authoring application: Microsoft Excel First seen: 2021-08-25
MD5: 4a04be680aee1be79911ef5e18a03ade SHA-1: 13c593b0dbc0851e7303c734b4b3a3e7bb77c2aa SHA-256: 5b32fd7df9ae08884f222f610d0c19df502bf1e59a56cb3d6c85717effcbd685
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 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. This is a common technique for delivering secondary payloads, hence the high confidence in an attack pattern involving code execution and payload delivery.

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) 6514 bytes
SHA-256: c510c359378a84449c8e16b357a10fb2f1c48d02a664bf1db12c7b1499faed1a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  XaSIKEZ
' 0018     26 LABEL : Cell Value, String Constant - AiaROJrWhRw len=0 
' 0018     21 LABEL : Cell Value, String Constant - AlMOTB len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G149 
' 0018     23 LABEL : Cell Value, String Constant - auwQkIsb len=0 
' 0018     23 LABEL : Cell Value, String Constant - DIKzbyvA len=0 
' 0018     22 LABEL : Cell Value, String Constant - DqTjBQc len=0 
' 0018     25 LABEL : Cell Value, String Constant - EbGkzPXPOZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - kaljGzeBX len=0 
' 0018     22 LABEL : Cell Value, String Constant - mVATbgO len=0 
' 0018     21 LABEL : Cell Value, String Constant - mVFPbt len=0 
' 0018     23 LABEL : Cell Value, String Constant - NtdrSFEJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - pjlJJlObdM len=0 
' 0018     27 LABEL : Cell Value, String Constant - QIRTVksaATbC len=0 
' 0018     23 LABEL : Cell Value, String Constant - RpBSvjNR len=0 
' 0018     22 LABEL : Cell Value, String Constant - SOhZjjM len=0 
' 0018     27 LABEL : Cell Value, String Constant - uFEwewCzUUpj len=0 
' 0018     21 LABEL : Cell Value, String Constant - weaDQV len=0 
' 0018     27 LABEL : Cell Value, String Constant - WhBoTwaBYTNm len=0 
' 0018     27 LABEL : Cell Value, String Constant - wQTIucMjWJbP len=0 
' 0018     24 LABEL : Cell Value, String Constant - xWovLfpes len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZZZyoI 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/ SST
' 00f
... (truncated)

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