Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 676774212765e946…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:03 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 7579f17eb6c47edfd26355779deabe66 SHA-1: 958e0c9d6be6eff5062aa405e3c018e36ee40338 SHA-256: 676774212765e9466ef901408d3671fbbe7408bdbb148d1035859761b4301f8e
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, which is a known method for executing malicious code. The macro sheet contains a call to a dangerous function (RUN=0), suggesting it is designed to download and execute a payload. No specific family could be identified, and no direct IOCs like URLs or hashes were extracted from the macro content.

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) 6522 bytes
SHA-256: c7c8bc3e34407b41ace675294e4dc438173608ee443fc3f01288a1867794a6b4
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 -  PBDgllY
' 0018     23 LABEL : Cell Value, String Constant - AmvPATJq len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C161 
' 0018     25 LABEL : Cell Value, String Constant - CTAQbvXrKH len=0 
' 0018     26 LABEL : Cell Value, String Constant - enhAEIYqYYp len=0 
' 0018     22 LABEL : Cell Value, String Constant - ftLrBQi len=0 
' 0018     20 LABEL : Cell Value, String Constant - GGZdE len=0 
' 0018     27 LABEL : Cell Value, String Constant - LxrVDwSIpTSS len=0 
' 0018     20 LABEL : Cell Value, String Constant - mHKfN len=0 
' 0018     21 LABEL : Cell Value, String Constant - NaEFQS len=0 
' 0018     20 LABEL : Cell Value, String Constant - NWkUE len=0 
' 0018     27 LABEL : Cell Value, String Constant - QAAqHDnaodNh len=0 
' 0018     23 LABEL : Cell Value, String Constant - QOpJUSzV len=0 
' 0018     22 LABEL : Cell Value, String Constant - rHsQRJd len=0 
' 0018     25 LABEL : Cell Value, String Constant - riwbxdimGT len=0 
' 0018     26 LABEL : Cell Value, String Constant - rsNQGyeXmqC len=0 
' 0018     26 LABEL : Cell Value, String Constant - UiHWKhJBLxL len=0 
' 0018     24 LABEL : Cell Value, String Constant - VrQMCmOUv len=0 
' 0018     21 LABEL : Cell Value, String Constant - WmzlUF len=0 
' 0018     27 LABEL : Cell Value, String Constant - wPUZKldefwrx len=0 
' 0018     24 LABEL : Cell Value, String Constant - YJKRTnaqk len=0 
' 0018     23 LABEL : Cell Value, String Constant - yRBlZUlJ 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 
... (truncated)

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