Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 783cf02cc7a224c3…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:50 Authoring application: Microsoft Excel First seen: 2021-10-14
MD5: 03c64bffdc0784c88033d64acc67258d SHA-1: 9df669dbbf8ca7310ceae64bdc86f6ee5c610f00 SHA-256: 783cf02cc7a224c32c5d1a2c7d3131d3cac81398d3b138775a67490a3416d76d
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open function, which is a critical indicator of malicious intent. This function is designed to execute automatically when the workbook is opened, serving as a mechanism to run arbitrary code. The presence of dangerous formula APIs within the Auto_Open macro suggests it is intended to download and execute a secondary payload, aligning with common attack patterns for macro-based malware.

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) 6857 bytes
SHA-256: 2be3a3f2686dccff9f09996f2d7112d66deb29af20d7652d756c930c84f972dc
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 -  SGiRoIzXhsr
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F137 
' 0018     21 LABEL : Cell Value, String Constant - bpDAgO len=0 
' 0018     20 LABEL : Cell Value, String Constant - BwGgN len=0 
' 0018     26 LABEL : Cell Value, String Constant - cihdnYeLRtW len=0 
' 0018     20 LABEL : Cell Value, String Constant - hGmZp len=0 
' 0018     25 LABEL : Cell Value, String Constant - INXqryAaPc len=0 
' 0018     27 LABEL : Cell Value, String Constant - itVpwBRiVctr len=0 
' 0018     26 LABEL : Cell Value, String Constant - KPdmvUKXxnG len=0 
' 0018     20 LABEL : Cell Value, String Constant - Ktjhp len=0 
' 0018     24 LABEL : Cell Value, String Constant - MQwRpequH len=0 
' 0018     25 LABEL : Cell Value, String Constant - NctAObJDbs len=0 
' 0018     26 LABEL : Cell Value, String Constant - oOOhLyIafph len=0 
' 0018     27 LABEL : Cell Value, String Constant - oRpncXnuGjpm len=0 
' 0018     24 LABEL : Cell Value, String Constant - tayyKPKCE len=0 
' 0018     20 LABEL : Cell Value, String Constant - thWTd len=0 
' 0018     21 LABEL : Cell Value, String Constant - TQBZti len=0 
' 0018     24 LABEL : Cell Value, String Constant - UCkhPYwXW len=0 
' 0018     27 LABEL : Cell Value, String Constant - VUlnroIjhuna len=0 
' 0018     22 LABEL : Cell Value, String Constant - yjSZKCu len=0 
' 0018     23 LABEL : Cell Value, String Constant - YOIHpOKs len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZWLcJEdxgct 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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