Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 745b2dd6e5342aa2…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:44:30 Authoring application: Microsoft Excel First seen: 2021-07-02
MD5: 378ef39828c4ecd945ac5cde0b85ce2d SHA-1: 55493886e6a351cc1a49be2cffcf1cb219c1c4c4 SHA-256: 745b2dd6e5342aa2b7d1ca699084be3d7cc4e2060c9d1a2c4d047d5647900d5b
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 finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely a downloader for a second-stage payload. No specific URLs or hashes were extracted, limiting further IOC identification.

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) 6569 bytes
SHA-256: 00952d49b94d1d2bca487a5cd42773a124696b4acdd944f26565fabd9dd28e2e
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 -  XrO
' 0018     24 LABEL : Cell Value, String Constant - aEQBWQURq len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H192 
' 0018     27 LABEL : Cell Value, String Constant - bAupdqTBKBUz len=0 
' 0018     24 LABEL : Cell Value, String Constant - bNtXLrulr len=0 
' 0018     27 LABEL : Cell Value, String Constant - BXpCuUJJKmED len=0 
' 0018     20 LABEL : Cell Value, String Constant - BZSjn len=0 
' 0018     26 LABEL : Cell Value, String Constant - CJqdPqUJTAl len=0 
' 0018     25 LABEL : Cell Value, String Constant - ecgLadgsjO len=0 
' 0018     20 LABEL : Cell Value, String Constant - Eqhqo len=0 
' 0018     27 LABEL : Cell Value, String Constant - HtNuswUubhiQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - ImpdF len=0 
' 0018     24 LABEL : Cell Value, String Constant - jtllNWYXn len=0 
' 0018     21 LABEL : Cell Value, String Constant - QlQYZY len=0 
' 0018     20 LABEL : Cell Value, String Constant - TLYxP len=0 
' 0018     27 LABEL : Cell Value, String Constant - UBGTiHffEivY len=0 
' 0018     25 LABEL : Cell Value, String Constant - uVGwtaDrin len=0 
' 0018     23 LABEL : Cell Value, String Constant - VWKEmNLg len=0 
' 0018     21 LABEL : Cell Value, String Constant - wWSXmQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - xTiNYYoYOeZw len=0 
' 0018     25 LABEL : Cell Value, String Constant - xUIgHLLukp len=0 
' 0018     24 LABEL : Cell Value, String Constant - yvUdyWcSj 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)

Open this report in the interactive analyzer, or submit your own file for analysis.