Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 26c4072ba361d18a…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:29:13 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: c5ad3ce1f8ff9bfcf85dda29b3a3d453 SHA-1: 8879513ca45a462a7ad68b2c247b08eb180368f1 SHA-256: 26c4072ba361d18a98f3d5c323c0f5b8c8a03c4e5038f8a405c0c4225ef27787
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains an Excel 4.0 macro sheet with an Auto_Open defined name, indicating an attempt to automatically execute code upon opening. Heuristics also identified the use of dangerous formula APIs within the Auto_Open macro, suggesting the execution of arbitrary commands. The specific commands or payload are not directly visible in the provided evidence, but the presence of Auto_Open and dangerous functions strongly implies 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) 6620 bytes
SHA-256: 18d0eeb438b10003396867c5c46822c0e8d33bb5d4abaa474de8bc6626029bce
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 -  qXrdWtWEZAI
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H134 
' 0018     21 LABEL : Cell Value, String Constant - BBJhGn len=0 
' 0018     24 LABEL : Cell Value, String Constant - BDqqdVSrD len=0 
' 0018     27 LABEL : Cell Value, String Constant - bpZBREuDfPoH len=0 
' 0018     25 LABEL : Cell Value, String Constant - FFHtmpfque len=0 
' 0018     22 LABEL : Cell Value, String Constant - HOmbJrt len=0 
' 0018     23 LABEL : Cell Value, String Constant - HqpTpmYm len=0 
' 0018     20 LABEL : Cell Value, String Constant - KBAlO len=0 
' 0018     26 LABEL : Cell Value, String Constant - Krrrqyuvdqn len=0 
' 0018     20 LABEL : Cell Value, String Constant - lLDia len=0 
' 0018     22 LABEL : Cell Value, String Constant - LyYKOkY len=0 
' 0018     23 LABEL : Cell Value, String Constant - nNMcAmpO len=0 
' 0018     20 LABEL : Cell Value, String Constant - oseOD len=0 
' 0018     25 LABEL : Cell Value, String Constant - PJZMDGIIFl len=0 
' 0018     20 LABEL : Cell Value, String Constant - pTANV len=0 
' 0018     25 LABEL : Cell Value, String Constant - QrQzqgWCyJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - QvtPmtw len=0 
' 0018     20 LABEL : Cell Value, String Constant - QXvkK len=0 
' 0018     27 LABEL : Cell Value, String Constant - sKLCREFOvFcl len=0 
' 0018     23 LABEL : Cell Value, String Constant - ubzxaoUw len=0 
' 0018     27 LABEL : Cell Value, String Constant - xcuYthYsHlql 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
... (truncated)

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