Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5b93e909a1e1fd8f…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:46:53 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: 2a6365690b52f45eaf810c2e9b4015ed SHA-1: be49ee3d031aa7b820d192a209aa97ffb2dbb0c8 SHA-256: 5b93e909a1e1fd8f1c0d35c9e3afc25d5e2edb5833a14b939e8bab81ee9f68de
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. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The macro likely attempts to download and execute a secondary payload, although the specific URL or payload is not directly extractable from the provided 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) 6514 bytes
SHA-256: 3b89c93a9b6d082502517e0fb66ac84dba545500c3259d61795b4d7cad681415
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 -  acCPezH
' 0018     20 LABEL : Cell Value, String Constant - AKZMo len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A132 
' 0018     27 LABEL : Cell Value, String Constant - CWBJSycfooKi len=0 
' 0018     26 LABEL : Cell Value, String Constant - fbIvApFpVjo len=0 
' 0018     26 LABEL : Cell Value, String Constant - fdjPdFMpmbz len=0 
' 0018     25 LABEL : Cell Value, String Constant - guhhnEGSmk len=0 
' 0018     22 LABEL : Cell Value, String Constant - GYfXBRP len=0 
' 0018     26 LABEL : Cell Value, String Constant - HhThiUtRQMs len=0 
' 0018     21 LABEL : Cell Value, String Constant - ICatyF len=0 
' 0018     21 LABEL : Cell Value, String Constant - iyVdxE len=0 
' 0018     21 LABEL : Cell Value, String Constant - jnZTNk len=0 
' 0018     27 LABEL : Cell Value, String Constant - NBXVREXFnZSs len=0 
' 0018     26 LABEL : Cell Value, String Constant - NZZWGYEdZcV len=0 
' 0018     27 LABEL : Cell Value, String Constant - ORAYxRAbeuKh len=0 
' 0018     22 LABEL : Cell Value, String Constant - pGRMRdy len=0 
' 0018     25 LABEL : Cell Value, String Constant - scVHkLlGSk len=0 
' 0018     26 LABEL : Cell Value, String Constant - uVlqaaejnbq len=0 
' 0018     22 LABEL : Cell Value, String Constant - uzeXNVc len=0 
' 0018     20 LABEL : Cell Value, String Constant - vtLRp len=0 
' 0018     20 LABEL : Cell Value, String Constant - YqjkH len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZAoDZZwbTz 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
' 00
... (truncated)

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