Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6d8b026665d3ad29…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:56 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 0781a08fd29a11cfc0d7719f2a967136 SHA-1: 0b708061d4c98aeb1a31b517df4cf4a75c2c1d58 SHA-256: 6d8b026665d3ad29b7870d8df152c4e9713902141a96270735599bc499c15c74
140 Risk Score

Malware Insights

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

The file is an Excel macro-enabled document containing Excel 4.0 (XLM) macros. The presence of an Auto_Open defined name and the use of dangerous formula APIs like RUN indicate that the macro is designed to automatically execute code upon opening. This functionality is commonly used to download and execute further malicious payloads.

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) 6593 bytes
SHA-256: 67141e39d929f1f0fe680d7b9656267dc7b82c0c66a5feccd91d8cea1eb09037
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 -  SgmfzWt
' 0018     20 LABEL : Cell Value, String Constant - AeEBN len=0 
' 0018     25 LABEL : Cell Value, String Constant - AHkPBdmrEH len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H134 
' 0018     22 LABEL : Cell Value, String Constant - cpfUOZE len=0 
' 0018     26 LABEL : Cell Value, String Constant - epPzJaCOXXi len=0 
' 0018     22 LABEL : Cell Value, String Constant - faLFxKy len=0 
' 0018     25 LABEL : Cell Value, String Constant - HrQgVgGMwc len=0 
' 0018     24 LABEL : Cell Value, String Constant - IZZyELjqG len=0 
' 0018     22 LABEL : Cell Value, String Constant - kawIisU len=0 
' 0018     25 LABEL : Cell Value, String Constant - MiSubtmHin len=0 
' 0018     24 LABEL : Cell Value, String Constant - nHVOfNKtH len=0 
' 0018     25 LABEL : Cell Value, String Constant - OhjMamObRu len=0 
' 0018     27 LABEL : Cell Value, String Constant - PtCfwKnSYdkC len=0 
' 0018     22 LABEL : Cell Value, String Constant - QWoELUW len=0 
' 0018     21 LABEL : Cell Value, String Constant - rZyhNl len=0 
' 0018     27 LABEL : Cell Value, String Constant - SaPCjktIgmEz len=0 
' 0018     26 LABEL : Cell Value, String Constant - wwznkcuoqHy len=0 
' 0018     24 LABEL : Cell Value, String Constant - WyfNitExY len=0 
' 0018     27 LABEL : Cell Value, String Constant - yPAqNtGXLiGo len=0 
' 0018     26 LABEL : Cell Value, String Constant - ypXERUJAMin len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZeesFCrje 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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