Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c2699e2e78b946c6…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:43:47 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: f82cb13d6260c0074f13da5fa54a308a SHA-1: 82b498641e5a46d8bc80a6a20828a9fadd3e6101 SHA-256: c2699e2e78b946c6df278be333ea3dde3722478bc172d31d89703f1d7c3ec013
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. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. While the exact payload is not visible, the technique strongly implies an attempt to exploit the client execution vulnerability.

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) 6792 bytes
SHA-256: c8605f070ad3e3f466a1cc3d7e90c16e55dd86506c0efbbe8c3a15e21fc16fe1
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  SmugIT
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D187 
' 0018     21 LABEL : Cell Value, String Constant - cBmdkF len=0 
' 0018     26 LABEL : Cell Value, String Constant - eflGTcMXRFH len=0 
' 0018     24 LABEL : Cell Value, String Constant - eHEriPSkO len=0 
' 0018     23 LABEL : Cell Value, String Constant - FmRZXYnc len=0 
' 0018     22 LABEL : Cell Value, String Constant - hJOXMyU len=0 
' 0018     27 LABEL : Cell Value, String Constant - HvjFnxnRtmPp len=0 
' 0018     25 LABEL : Cell Value, String Constant - JLftSMvrsD len=0 
' 0018     26 LABEL : Cell Value, String Constant - lCRUZwtlbCv len=0 
' 0018     27 LABEL : Cell Value, String Constant - LgEWRbtVICVU len=0 
' 0018     22 LABEL : Cell Value, String Constant - LXylwrg len=0 
' 0018     22 LABEL : Cell Value, String Constant - okaVzlh len=0 
' 0018     20 LABEL : Cell Value, String Constant - QKZCE len=0 
' 0018     23 LABEL : Cell Value, String Constant - qnISGnre len=0 
' 0018     22 LABEL : Cell Value, String Constant - sfMiAAu len=0 
' 0018     23 LABEL : Cell Value, String Constant - skzGHzNM len=0 
' 0018     20 LABEL : Cell Value, String Constant - viCMT len=0 
' 0018     20 LABEL : Cell Value, String Constant - WmOgg len=0 
' 0018     27 LABEL : Cell Value, String Constant - xAxGRhBUWPbQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - yAWmPlQHoBl len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZsPCeVfjMZy 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)

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