Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6ed216a4467d6fc3…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:44:10 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: a4381cb8467cfcf65a3fce7738c93f99 SHA-1: 1711b8a0a1f0e749f16fee2315058a68ba9195b8 SHA-256: 6ed216a4467d6fc3dcf6b23c8adbb969f71138f52cfed5ae7a79757d156f03c5
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 sheet containing an Auto_Open entry, which is a known technique for executing malicious code upon opening. The heuristics indicate the use of dangerous formula APIs, suggesting the macro attempts to perform actions beyond standard spreadsheet operations. While the specific payload is not visible, the presence of Auto_Open and dangerous functions strongly implies an intent to download and execute a secondary malicious component.

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) 6661 bytes
SHA-256: 93fa20861f6fe7105f057666b61b5eabaf39d70fa7bf8522e4b0b1a73a947ac1
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  TJzpVH
' 0018     20 LABEL : Cell Value, String Constant - ADmsu len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B146 
' 0018     23 LABEL : Cell Value, String Constant - CuNdWAbT len=0 
' 0018     20 LABEL : Cell Value, String Constant - fgqbP len=0 
' 0018     20 LABEL : Cell Value, String Constant - gapPq len=0 
' 0018     22 LABEL : Cell Value, String Constant - gMAfypr len=0 
' 0018     22 LABEL : Cell Value, String Constant - lNdQvwp len=0 
' 0018     22 LABEL : Cell Value, String Constant - lOqIbzX len=0 
' 0018     25 LABEL : Cell Value, String Constant - mchoXIJuXm len=0 
' 0018     24 LABEL : Cell Value, String Constant - MLdbcrFQb len=0 
' 0018     20 LABEL : Cell Value, String Constant - OHuiU len=0 
' 0018     20 LABEL : Cell Value, String Constant - qFScq len=0 
' 0018     22 LABEL : Cell Value, String Constant - QRVtyHb len=0 
' 0018     27 LABEL : Cell Value, String Constant - QtdkMWDsXxgH len=0 
' 0018     22 LABEL : Cell Value, String Constant - SEGwdWF len=0 
' 0018     22 LABEL : Cell Value, String Constant - txzLbHK len=0 
' 0018     21 LABEL : Cell Value, String Constant - UhhbiB len=0 
' 0018     22 LABEL : Cell Value, String Constant - VqeBsmX len=0 
' 0018     21 LABEL : Cell Value, String Constant - VSuCzp len=0 
' 0018     26 LABEL : Cell Value, String Constant - VvCkusAClXE len=0 
' 0018     27 LABEL : Cell Value, String Constant - xTSADLZnaiaA 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
' 00fd     10 LABELSST : Cell Va
... (truncated)

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