Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1bd018c4eacee38d…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:14 Authoring application: Microsoft Excel First seen: 2021-05-26
MD5: 70e04753c94839e3b6345e86396f5f8f SHA-1: 388580a5d3a89358a3394f12f0a5551af4595224 SHA-256: 1bd018c4eacee38dd642bdc6878c142dfd3db1626ed8282cbce8f99591319461
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a known technique for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates the macro is designed to execute arbitrary commands. No specific family could be identified, but the technique is common for initial execution.

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) 6324 bytes
SHA-256: 08c9d3764405f790c45daa29524d28fcdc67c518b51d5d2c3a431ed68218f601
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  zOU
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A172 
' 0018     22 LABEL : Cell Value, String Constant - BCUauks len=0 
' 0018     22 LABEL : Cell Value, String Constant - bvYqXPi len=0 
' 0018     24 LABEL : Cell Value, String Constant - crAriPWYn len=0 
' 0018     21 LABEL : Cell Value, String Constant - cWjfnb len=0 
' 0018     23 LABEL : Cell Value, String Constant - diyYwjNM len=0 
' 0018     22 LABEL : Cell Value, String Constant - dmWUcNw len=0 
' 0018     24 LABEL : Cell Value, String Constant - hhaoHeyzj len=0 
' 0018     25 LABEL : Cell Value, String Constant - iHCNhxwTSu len=0 
' 0018     21 LABEL : Cell Value, String Constant - MNOVOn len=0 
' 0018     21 LABEL : Cell Value, String Constant - OREwoF len=0 
' 0018     21 LABEL : Cell Value, String Constant - PxTRjT len=0 
' 0018     26 LABEL : Cell Value, String Constant - QshyKhAIPjV len=0 
' 0018     25 LABEL : Cell Value, String Constant - QXgHxwYGKW len=0 
' 0018     23 LABEL : Cell Value, String Constant - rNUyAAHU len=0 
' 0018     21 LABEL : Cell Value, String Constant - sfxbid len=0 
' 0018     21 LABEL : Cell Value, String Constant - toXQqp len=0 
' 0018     26 LABEL : Cell Value, String Constant - wPdtYTmOxxV len=0 
' 0018     20 LABEL : Cell Value, String Constant - XBAVv len=0 
' 0018     23 LABEL : Cell Value, String Constant - xFiyREQU len=0 
' 0018     23 LABEL : Cell Value, String Constant - xmsokEuW 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 LABELSST : Cell
... (truncated)

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