Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4e0b82660d6db18f…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:39:08 Authoring application: Microsoft Excel First seen: 2021-05-26
MD5: e756877d507f422e887e9dbd8ddc0120 SHA-1: c32357cc36986fb9277db8d7eb4a542cbd475f84 SHA-256: 4e0b82660d6db18fb427d9378267d614df3fc4984d17a43a34033d60324288ef
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, specifically an Auto_Open defined name, which is a known method for executing malicious code upon opening the workbook. The macro sheet contains dangerous formula APIs, suggesting it is designed to run commands. No specific IOCs like URLs or file paths were extracted, but the technique itself is highly indicative of malicious intent.

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) 6798 bytes
SHA-256: 97f3f9ff5a710a038c9c3c4b494487db00bd4bcd0992702a5d4ba6c962e3c094
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  XgTnmvp
' 0018     23 LABEL : Cell Value, String Constant - ABYyOBdw len=0 
' 0018     25 LABEL : Cell Value, String Constant - AjDgmBvxLv len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H160 
' 0018     23 LABEL : Cell Value, String Constant - cihjZbQi len=0 
' 0018     26 LABEL : Cell Value, String Constant - CnRwzsBdQBl len=0 
' 0018     25 LABEL : Cell Value, String Constant - dazwpUFxyZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - dnLLStcKzonS len=0 
' 0018     21 LABEL : Cell Value, String Constant - DzpjfR len=0 
' 0018     24 LABEL : Cell Value, String Constant - FCEiPXMot len=0 
' 0018     26 LABEL : Cell Value, String Constant - GPStVlkSiGP len=0 
' 0018     22 LABEL : Cell Value, String Constant - jtHbbGC len=0 
' 0018     21 LABEL : Cell Value, String Constant - KFACDK len=0 
' 0018     25 LABEL : Cell Value, String Constant - lJxxDRVIsV len=0 
' 0018     23 LABEL : Cell Value, String Constant - NlDgdTmE len=0 
' 0018     20 LABEL : Cell Value, String Constant - pJHuv len=0 
' 0018     26 LABEL : Cell Value, String Constant - RfcCfUiyCus len=0 
' 0018     22 LABEL : Cell Value, String Constant - sztsjUk len=0 
' 0018     27 LABEL : Cell Value, String Constant - tvPuqnBENVLq len=0 
' 0018     25 LABEL : Cell Value, String Constant - UgDCDPcAkH len=0 
' 0018     26 LABEL : Cell Value, String Constant - uubbzZahKIN len=0 
' 0018     23 LABEL : Cell Value, String Constant - XShHcQcZ 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)

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