Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 917f32f4ca0386f2…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:33:21 Authoring application: Microsoft Excel First seen: 2021-10-11
MD5: 0898b2547a4218a19e468c77a4cf0593 SHA-1: 8b780d86869b8c83bcfdd978ec951210e6816a41 SHA-256: 917f32f4ca0386f2941e7dce469c3204c0b489b297bbeb87ebd72e0f9e114833
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 common technique for executing malicious code upon opening. The critical heuristic firings indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting it's designed to run arbitrary commands. No specific IOCs like URLs or hashes were extracted, but the technique itself is highly indicative of malicious intent.

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) 6439 bytes
SHA-256: 37027354e8e769fb18bb8888da8dd1514f9dbd96089a01523da3ae54ce473b1b
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xKRZ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F144 
' 0018     23 LABEL : Cell Value, String Constant - CawEYbRZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - cGNuBqdyaKw len=0 
' 0018     24 LABEL : Cell Value, String Constant - etLkHSgrD len=0 
' 0018     27 LABEL : Cell Value, String Constant - hdRYXzlLPTXE len=0 
' 0018     20 LABEL : Cell Value, String Constant - HIWpF len=0 
' 0018     23 LABEL : Cell Value, String Constant - HmxkJHvK len=0 
' 0018     23 LABEL : Cell Value, String Constant - iEREvvSK len=0 
' 0018     25 LABEL : Cell Value, String Constant - iNnIFlwHde len=0 
' 0018     25 LABEL : Cell Value, String Constant - jgTaXyPvKU len=0 
' 0018     20 LABEL : Cell Value, String Constant - JKGTC len=0 
' 0018     23 LABEL : Cell Value, String Constant - kZtxGZGg len=0 
' 0018     24 LABEL : Cell Value, String Constant - nkZizZYcm len=0 
' 0018     25 LABEL : Cell Value, String Constant - ojAYGIgGFb len=0 
' 0018     23 LABEL : Cell Value, String Constant - PfifufHi len=0 
' 0018     22 LABEL : Cell Value, String Constant - pkVDiVF len=0 
' 0018     25 LABEL : Cell Value, String Constant - QAUfLnCUso len=0 
' 0018     20 LABEL : Cell Value, String Constant - qzyxP len=0 
' 0018     23 LABEL : Cell Value, String Constant - wxQqDFiU len=0 
' 0018     24 LABEL : Cell Value, String Constant - zEFYhIPfp len=0 
' 0018     22 LABEL : Cell Value, String Constant - zZeTWMT 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 L
... (truncated)

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