Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0624e81f89b82f54…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:46:29 Authoring application: Microsoft Excel First seen: 2021-10-02
MD5: ffab011dec77695c66a23dca54eec6f0 SHA-1: 90b22927f7d61a5fce1dc010ea4c35832d694b45 SHA-256: 0624e81f89b82f54de3cf657599cdd869ee9643e705ca0c92483078009a88a26
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, suggesting an attempt to automatically execute code when the file is opened. The presence of dangerous formula APIs further increases the risk. While the specific payload is not clear from the static analysis, the Auto_Open function is a common method for initial execution of malicious scripts or payloads.

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) 6895 bytes
SHA-256: cf80b048bde63ab4da0c40d5ecacad054431d9516ec9f643b80245a6a30eb584
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  YpdIeGsJjv
' 0018     23 LABEL : Cell Value, String Constant - aORPtZJM len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B164 
' 0018     27 LABEL : Cell Value, String Constant - bqbyPzvBKRwH len=0 
' 0018     22 LABEL : Cell Value, String Constant - btMqIZy len=0 
' 0018     25 LABEL : Cell Value, String Constant - FhpBxOCAEc len=0 
' 0018     24 LABEL : Cell Value, String Constant - fqCUvAxnQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - GibHlq len=0 
' 0018     20 LABEL : Cell Value, String Constant - gnrIO len=0 
' 0018     26 LABEL : Cell Value, String Constant - iPEQMRUjGHh len=0 
' 0018     26 LABEL : Cell Value, String Constant - JGQRmREYdzn len=0 
' 0018     23 LABEL : Cell Value, String Constant - LUxjiQqJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - MPaoMhr len=0 
' 0018     21 LABEL : Cell Value, String Constant - niLbAv len=0 
' 0018     27 LABEL : Cell Value, String Constant - QBOOHbfzxDcw len=0 
' 0018     24 LABEL : Cell Value, String Constant - RFTxQfnCQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - SVhvaKm len=0 
' 0018     25 LABEL : Cell Value, String Constant - tNnEJugBVJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - uztIXf len=0 
' 0018     20 LABEL : Cell Value, String Constant - vvPDw len=0 
' 0018     27 LABEL : Cell Value, String Constant - wgmRbuGiKGad len=0 
' 0018     22 LABEL : Cell Value, String Constant - xlunLFA 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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