Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ddf6247c1df16ab7…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:48 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: cea32617a07fbee790c7105d609e9c2e SHA-1: 8edc13e591fe6c4f52fa66eee9eb56bafa37dd81 SHA-256: ddf6247c1df16ab76d30f6f8cb70d066f94a820ef437abe8842697054db1d205
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. This function is known to be used for executing malicious code, often to download and run further payloads. The critical heuristics indicate the presence of dangerous formula APIs within the Auto_Open macro, confirming its 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) 6427 bytes
SHA-256: 39753d9eabe48fd7492400f39745157652ac87f84f45a5c9b7ccf9176d36412c
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  jlImq
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H186 
' 0018     23 LABEL : Cell Value, String Constant - BbCwWNNk len=0 
' 0018     22 LABEL : Cell Value, String Constant - CvryBTy len=0 
' 0018     23 LABEL : Cell Value, String Constant - dmFqwzRv len=0 
' 0018     27 LABEL : Cell Value, String Constant - DsJrPzsUfxuE len=0 
' 0018     21 LABEL : Cell Value, String Constant - fdjetc len=0 
' 0018     23 LABEL : Cell Value, String Constant - fExEeULz len=0 
' 0018     23 LABEL : Cell Value, String Constant - GpZzdfDQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - gVzvbF len=0 
' 0018     21 LABEL : Cell Value, String Constant - imHPmU len=0 
' 0018     25 LABEL : Cell Value, String Constant - jMyaFXwhNJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - juvQBdiF len=0 
' 0018     21 LABEL : Cell Value, String Constant - OIIQqV len=0 
' 0018     20 LABEL : Cell Value, String Constant - QMyND len=0 
' 0018     26 LABEL : Cell Value, String Constant - RCjIdUHAgRS len=0 
' 0018     24 LABEL : Cell Value, String Constant - rFzVmYZea len=0 
' 0018     25 LABEL : Cell Value, String Constant - VXOKLWYJAj len=0 
' 0018     21 LABEL : Cell Value, String Constant - YAHTEV len=0 
' 0018     26 LABEL : Cell Value, String Constant - ySvmHGrKZyh len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZViEFSJaMA len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZwNiCo 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 LABELS
... (truncated)

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