Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fee3a1905e7f6cdc…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:20 Authoring application: Microsoft Excel First seen: 2021-06-17
MD5: d0628c6f8a0b997a6d9e56b0856e59bd SHA-1: d7ba797eabe939b125f4871294768bf430a6a9ae SHA-256: fee3a1905e7f6cdc6cab84ff170015273ef9b34ebcac2e9bb79caee86d8fbdf3
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 activity. The presence of dangerous formula APIs like RUN in the Auto_Open macro suggests an attempt to execute arbitrary code. While the exact payload is not discernible from the provided evidence, the mechanism points to a macro-based execution of a second-stage payload.

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) 6545 bytes
SHA-256: 65b00c21186076acf47bcc71270960c98c49c7d39166a143849dbbe80b8672ad
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  RcaIsAQqX
' 0018     25 LABEL : Cell Value, String Constant - ADIIVnRBob len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C150 
' 0018     24 LABEL : Cell Value, String Constant - bAJBcRVMc len=0 
' 0018     20 LABEL : Cell Value, String Constant - fslsH len=0 
' 0018     27 LABEL : Cell Value, String Constant - GBdtMusOmoZZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - gPclTsQy len=0 
' 0018     22 LABEL : Cell Value, String Constant - IEUcctJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - kGEuX len=0 
' 0018     21 LABEL : Cell Value, String Constant - LJOhjh len=0 
' 0018     25 LABEL : Cell Value, String Constant - pFMtttmmyj len=0 
' 0018     22 LABEL : Cell Value, String Constant - SGwuyFm len=0 
' 0018     21 LABEL : Cell Value, String Constant - sisiFg len=0 
' 0018     20 LABEL : Cell Value, String Constant - tldve len=0 
' 0018     26 LABEL : Cell Value, String Constant - TQkuCGXiSsj len=0 
' 0018     27 LABEL : Cell Value, String Constant - uNMCNaXVxwTy len=0 
' 0018     26 LABEL : Cell Value, String Constant - URLtdmUSDhA len=0 
' 0018     21 LABEL : Cell Value, String Constant - UudbfI len=0 
' 0018     20 LABEL : Cell Value, String Constant - WabkL len=0 
' 0018     21 LABEL : Cell Value, String Constant - WUofNl len=0 
' 0018     21 LABEL : Cell Value, String Constant - zhdwhq len=0 
' 0018     27 LABEL : Cell Value, String Constant - zQToZvSSpmYy 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 LABE
... (truncated)

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