Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3b06d4b2419d8533…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:39:56 Authoring application: Microsoft Excel First seen: 2021-07-13
MD5: d985d33520062e83650f0e28198fc608 SHA-1: 99ddf65cac3daa6d066567f34208ccaf4ec9e26f SHA-256: 3b06d4b2419d853304a096896d08cc2bee5640e9d1c0f760af850eb1369ae41a
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an Excel document containing Excel 4.0 (XLM) macros, specifically an Auto_Open function. This indicates an attempt to automatically execute code upon opening the document, a common technique for malware delivery. The presence of dangerous formula APIs further increases the suspicion. No specific family could be identified, and no direct IOCs like URLs or hashes were extracted from the macro content itself.

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) 6879 bytes
SHA-256: 81e345ff431f37a7f92659b4d0f830a1040c4af4a656870d94b38aa9d61bf730
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  DpBuXFbjmFG
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A176 
' 0018     27 LABEL : Cell Value, String Constant - awsTTGRSPOls len=0 
' 0018     23 LABEL : Cell Value, String Constant - CkgAuIsf len=0 
' 0018     25 LABEL : Cell Value, String Constant - FHoSqzZFJp len=0 
' 0018     24 LABEL : Cell Value, String Constant - FvTOlgWAo len=0 
' 0018     20 LABEL : Cell Value, String Constant - GmPYh len=0 
' 0018     27 LABEL : Cell Value, String Constant - GXiQPOaISIdy len=0 
' 0018     27 LABEL : Cell Value, String Constant - jtWNCRFVGTNa len=0 
' 0018     23 LABEL : Cell Value, String Constant - JXgaHthn len=0 
' 0018     22 LABEL : Cell Value, String Constant - mdqnvaw len=0 
' 0018     21 LABEL : Cell Value, String Constant - nTxqmU len=0 
' 0018     27 LABEL : Cell Value, String Constant - OxZTuxkPPsMl len=0 
' 0018     21 LABEL : Cell Value, String Constant - qPTdzy len=0 
' 0018     20 LABEL : Cell Value, String Constant - Tzqos len=0 
' 0018     23 LABEL : Cell Value, String Constant - UbfHLOxi len=0 
' 0018     26 LABEL : Cell Value, String Constant - UhpZHNNoAge len=0 
' 0018     22 LABEL : Cell Value, String Constant - WnxcVHP len=0 
' 0018     25 LABEL : Cell Value, String Constant - WXTtYxIqZD len=0 
' 0018     21 LABEL : Cell Value, String Constant - xPWReL len=0 
' 0018     26 LABEL : Cell Value, String Constant - YfOVkVwtGyY len=0 
' 0018     25 LABEL : Cell Value, String Constant - YILfzmHpaB 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

... (truncated)

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