Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6d06873878d32eba…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:46:16 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 34690e6ae33abcee6346094fdbc03c51 SHA-1: e96a282b22d9d683e27ce36e382f2dbb2dc6bd38 SHA-256: 6d06873878d32ebaad09de6cdae739772b6c7e9908de9711415bc74c185e2933
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open function, which is a known technique for executing malicious code upon opening. The heuristics indicate the use of dangerous formula APIs within the XLM macro, suggesting it is designed to download and execute a secondary payload. No specific IOCs like URLs or hashes were extracted from the macro content itself.

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) 6657 bytes
SHA-256: fa1328b0ce619f594e82fb354badb598ae9fd7f798a92c3d82ad8a3efca5701b
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  eKv
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A160 
' 0018     27 LABEL : Cell Value, String Constant - ayyWycFedoeY len=0 
' 0018     25 LABEL : Cell Value, String Constant - CilWzNnpMP len=0 
' 0018     23 LABEL : Cell Value, String Constant - DcxMXELK len=0 
' 0018     26 LABEL : Cell Value, String Constant - FhtKxJXcGiI len=0 
' 0018     25 LABEL : Cell Value, String Constant - fZEQbwrvNk len=0 
' 0018     23 LABEL : Cell Value, String Constant - GFhSJelr len=0 
' 0018     27 LABEL : Cell Value, String Constant - GpKANdnvlJFa len=0 
' 0018     26 LABEL : Cell Value, String Constant - GwbSpgtCToo len=0 
' 0018     27 LABEL : Cell Value, String Constant - hxdZOMWghqrm len=0 
' 0018     22 LABEL : Cell Value, String Constant - lbHSyyO len=0 
' 0018     26 LABEL : Cell Value, String Constant - LDlLcceOHYi len=0 
' 0018     20 LABEL : Cell Value, String Constant - orkcy len=0 
' 0018     21 LABEL : Cell Value, String Constant - QoQGCJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - rQGcMVSMbiv len=0 
' 0018     23 LABEL : Cell Value, String Constant - RQVJRtye len=0 
' 0018     23 LABEL : Cell Value, String Constant - SLdNoLin len=0 
' 0018     22 LABEL : Cell Value, String Constant - sZhKenz len=0 
' 0018     26 LABEL : Cell Value, String Constant - VLwRoTsFvDw len=0 
' 0018     23 LABEL : Cell Value, String Constant - wrbPODDH len=0 
' 0018     22 LABEL : Cell Value, String Constant - YExDnRk 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

... (truncated)

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