Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c1fa9cebc22eb84c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:30 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 5c723bf8e5093210ff0ab375515865e6 SHA-1: 57e18619083f2f3ae2623d1d3785c5da46b8ad99 SHA-256: c1fa9cebc22eb84c9736b32f4df1fb197563a94cf7282195ccafb3f0a999a802
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 critical indicator of malicious intent. These macros are known to be used for executing arbitrary code, often to download and run further malicious payloads. The presence of dangerous formula APIs further supports this assessment.

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) 6830 bytes
SHA-256: 6935a2d82645145f2abf448174a75afcf08ad87313654824039f4c6ec1588b9e
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 -  qmCJQbQgqO
' 0018     20 LABEL : Cell Value, String Constant - AmzPS len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D147 
' 0018     24 LABEL : Cell Value, String Constant - cmmFGmopq len=0 
' 0018     22 LABEL : Cell Value, String Constant - dafmMpw len=0 
' 0018     22 LABEL : Cell Value, String Constant - doEzHWf len=0 
' 0018     26 LABEL : Cell Value, String Constant - dZCjhcsFYGt len=0 
' 0018     22 LABEL : Cell Value, String Constant - EBUiljZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - fPeyebVn len=0 
' 0018     26 LABEL : Cell Value, String Constant - hhxFPbSzqrm len=0 
' 0018     27 LABEL : Cell Value, String Constant - NJthvIdmiMUu len=0 
' 0018     27 LABEL : Cell Value, String Constant - NZeKlHnzeACG len=0 
' 0018     27 LABEL : Cell Value, String Constant - OVRmTelwlQQV len=0 
' 0018     22 LABEL : Cell Value, String Constant - oZBiurn len=0 
' 0018     26 LABEL : Cell Value, String Constant - PKKCWuVsFwc len=0 
' 0018     23 LABEL : Cell Value, String Constant - SGlQjSsB len=0 
' 0018     20 LABEL : Cell Value, String Constant - sRqTt len=0 
' 0018     27 LABEL : Cell Value, String Constant - TFKsOgUVUJZt len=0 
' 0018     24 LABEL : Cell Value, String Constant - tTVeSAaZV len=0 
' 0018     24 LABEL : Cell Value, String Constant - ukFyiccsw len=0 
' 0018     21 LABEL : Cell Value, String Constant - UMCbnp len=0 
' 0018     23 LABEL : Cell Value, String Constant - wuPXCjLn 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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