Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7d51b7855fa4637e…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:45:26 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 943713ded146727bbc0395e73c5a3b13 SHA-1: e662b230b9abedfa09cddbb7f83c8d6a0e5b9f1c SHA-256: 7d51b7855fa4637ec471691adab056c0efd22d13ea61306c3d27405aac3a3f17
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. Static analysis detected the presence of an Auto_Open defined name, which is a common technique for automatically executing macros when the workbook is opened. The critical heuristic 'OLE_XLM_DANGEROUS_FN' indicates the use of dangerous formula APIs within the macro, suggesting an intent to perform malicious actions. No specific IOCs like URLs or hashes were extracted, but the technique itself is a strong indicator 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) 6812 bytes
SHA-256: 7fac4975debbe0cc44560bcb72a149bbe68425f7a3ff19f8fe0166fd24cca620
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 -  IBHCYRc
' 0018     25 LABEL : Cell Value, String Constant - aLUvcpxBfe len=0 
' 0018     25 LABEL : Cell Value, String Constant - AMOdFsBzGR len=0 
' 0018     22 LABEL : Cell Value, String Constant - assYlKZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D178 
' 0018     23 LABEL : Cell Value, String Constant - dmhjzgps len=0 
' 0018     21 LABEL : Cell Value, String Constant - FbgLGV len=0 
' 0018     26 LABEL : Cell Value, String Constant - fVYZqKndSOL len=0 
' 0018     24 LABEL : Cell Value, String Constant - GamWAfEIa len=0 
' 0018     25 LABEL : Cell Value, String Constant - gXJXZgdKHs len=0 
' 0018     26 LABEL : Cell Value, String Constant - lWnkvqsHdfW len=0 
' 0018     26 LABEL : Cell Value, String Constant - neWecLoOepz len=0 
' 0018     27 LABEL : Cell Value, String Constant - ohSMgMwrnJHQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - OTFaP len=0 
' 0018     24 LABEL : Cell Value, String Constant - qxkHCJYck len=0 
' 0018     25 LABEL : Cell Value, String Constant - tFSuRxaouU len=0 
' 0018     22 LABEL : Cell Value, String Constant - UBdwBMl len=0 
' 0018     21 LABEL : Cell Value, String Constant - UEeDtb len=0 
' 0018     27 LABEL : Cell Value, String Constant - UWKVmocCtfel len=0 
' 0018     23 LABEL : Cell Value, String Constant - VjdDtoyD len=0 
' 0018     27 LABEL : Cell Value, String Constant - xhsRdhrxVxMa len=0 
' 0018     22 LABEL : Cell Value, String Constant - yGNpNyB 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/ SS
... (truncated)

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