Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a5ec4583b3484e29…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:43:33 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 1fbd1cce8d9edfeb0258308d5dbed8ac SHA-1: 668c895ddf4b08ae12437e1994f798dd210d9ae5 SHA-256: a5ec4583b3484e29f6462698b8b9b7736cf75cb0cfc36d23e7ed004cc94f6b9e
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 document containing an Auto_Open defined name, which is a critical indicator of malicious intent. This technique is commonly used to execute arbitrary code upon opening the document, typically to download and run a secondary payload. No specific family could be identified from the available evidence.

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) 6763 bytes
SHA-256: bfc8de435290636129ed5f19b06991d01526c9cf02cbaac6ad8e9b2cc5f2da1f
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 -  LeCnPht
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D167 
' 0018     24 LABEL : Cell Value, String Constant - BXpaSYebw len=0 
' 0018     25 LABEL : Cell Value, String Constant - EeEqdTnOzj len=0 
' 0018     25 LABEL : Cell Value, String Constant - eIHYjZFekj len=0 
' 0018     27 LABEL : Cell Value, String Constant - ezLftgDtvAVX len=0 
' 0018     25 LABEL : Cell Value, String Constant - fTgiOBntjd len=0 
' 0018     24 LABEL : Cell Value, String Constant - gjpymbgWG len=0 
' 0018     26 LABEL : Cell Value, String Constant - HxdNBCTotUq len=0 
' 0018     23 LABEL : Cell Value, String Constant - IrYvxlQq len=0 
' 0018     27 LABEL : Cell Value, String Constant - JnTIsojQAuMd len=0 
' 0018     20 LABEL : Cell Value, String Constant - JZhux len=0 
' 0018     25 LABEL : Cell Value, String Constant - mXsaLDApmD len=0 
' 0018     22 LABEL : Cell Value, String Constant - NifgCGb len=0 
' 0018     27 LABEL : Cell Value, String Constant - OhnnHGWrYXmL len=0 
' 0018     20 LABEL : Cell Value, String Constant - oqnOc len=0 
' 0018     21 LABEL : Cell Value, String Constant - pgALmk len=0 
' 0018     25 LABEL : Cell Value, String Constant - QdooGOUfBl len=0 
' 0018     27 LABEL : Cell Value, String Constant - QphZZjOsSCWn len=0 
' 0018     23 LABEL : Cell Value, String Constant - UMAkNNmT len=0 
' 0018     26 LABEL : Cell Value, String Constant - VLmTpPVfWGr len=0 
' 0018     27 LABEL : Cell Value, String Constant - VYbhOveObweH 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 Cons
... (truncated)

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