Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 02fa1e2db9e2b913…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:29:26 Authoring application: Microsoft Excel First seen: 2021-06-17
MD5: 2e71d456c381992ebc1f153f88f1eaff SHA-1: 953137b3e19516932d62aeb296a59c3fb1a0bfae SHA-256: 02fa1e2db9e2b913da173e43ee846f866c838b337eb3bfae2d5aa252548ba3fe
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, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristic firings. The presence of an Auto_Open defined name suggests that the macro is intended to execute automatically when the workbook is opened. The dangerous formula APIs used, specifically RUN=0, strongly indicate that the macro's purpose is to execute an external program or download a payload. No specific URLs or hashes were extracted, limiting further analysis of the payload.

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) 6685 bytes
SHA-256: 11f639a3581f4abd8ad31876d9dc0f6d05f348ea8fec5dd3cccac2c0a9717ea8
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 -  tNFvQjBpHHR
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G172 
' 0018     22 LABEL : Cell Value, String Constant - CMokAjV len=0 
' 0018     21 LABEL : Cell Value, String Constant - HImptM len=0 
' 0018     20 LABEL : Cell Value, String Constant - HpARP len=0 
' 0018     23 LABEL : Cell Value, String Constant - IrfnTSZo len=0 
' 0018     26 LABEL : Cell Value, String Constant - pfkeXoVZDIF len=0 
' 0018     24 LABEL : Cell Value, String Constant - pleBghLvv len=0 
' 0018     27 LABEL : Cell Value, String Constant - RJZpBltXxrjd len=0 
' 0018     23 LABEL : Cell Value, String Constant - svkMMRFl len=0 
' 0018     27 LABEL : Cell Value, String Constant - uHkvRIgTngkm len=0 
' 0018     27 LABEL : Cell Value, String Constant - UkIXttvUqYsP len=0 
' 0018     27 LABEL : Cell Value, String Constant - UksNuXoSlsAn len=0 
' 0018     26 LABEL : Cell Value, String Constant - ULeIEKmihiN len=0 
' 0018     27 LABEL : Cell Value, String Constant - UPZRlbsmmAVe len=0 
' 0018     21 LABEL : Cell Value, String Constant - uvFHHM len=0 
' 0018     24 LABEL : Cell Value, String Constant - vIGIUENaU len=0 
' 0018     22 LABEL : Cell Value, String Constant - XOmPRav len=0 
' 0018     25 LABEL : Cell Value, String Constant - YfzNMNpcXq len=0 
' 0018     22 LABEL : Cell Value, String Constant - zgkeZzk len=0 
' 0018     26 LABEL : Cell Value, String Constant - zIAaHoWUTMT len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZjASN 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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