Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2be976e227bbf685…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:43:48 Authoring application: Microsoft Excel First seen: 2021-06-04
MD5: e1baf9af2a11912dd67f310de02951eb SHA-1: fba98360f42ed05307af7541efcc9f666f37f685 SHA-256: 2be976e227bbf685458c945c24453b8386612d6d9d37e5c831f7daf067ce87ce
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel 4.0 macro sheet containing 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 external code. While the specific payload is not visible, the pattern strongly suggests a downloader or initial execution stage for further malicious activity.

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) 6843 bytes
SHA-256: 004b4f8375cca4285132e3f996c13e13645e0db23a9ab3c6240ce952db3d208a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  RNbFTwTycWj
' 0018     24 LABEL : Cell Value, String Constant - AamKpdtzD len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A144 
' 0018     20 LABEL : Cell Value, String Constant - eMeaB len=0 
' 0018     24 LABEL : Cell Value, String Constant - EzsKxcbMs len=0 
' 0018     22 LABEL : Cell Value, String Constant - fAcqlnV len=0 
' 0018     23 LABEL : Cell Value, String Constant - fgEhFmYq len=0 
' 0018     23 LABEL : Cell Value, String Constant - fYLjilYG len=0 
' 0018     23 LABEL : Cell Value, String Constant - gCXSESQF len=0 
' 0018     20 LABEL : Cell Value, String Constant - HgQpz len=0 
' 0018     21 LABEL : Cell Value, String Constant - igAkCd len=0 
' 0018     25 LABEL : Cell Value, String Constant - jzMeTLjDui len=0 
' 0018     21 LABEL : Cell Value, String Constant - KROYCy len=0 
' 0018     20 LABEL : Cell Value, String Constant - kSkYs len=0 
' 0018     23 LABEL : Cell Value, String Constant - OxJjCCXL len=0 
' 0018     21 LABEL : Cell Value, String Constant - OXYOCw len=0 
' 0018     22 LABEL : Cell Value, String Constant - pAyiVzo len=0 
' 0018     21 LABEL : Cell Value, String Constant - VQHXUm len=0 
' 0018     20 LABEL : Cell Value, String Constant - VToSF len=0 
' 0018     25 LABEL : Cell Value, String Constant - wjwsMuSuVm len=0 
' 0018     27 LABEL : Cell Value, String Constant - YzQFxagxQjaQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - zWrkLS 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 LABELSST : Cell
... (truncated)

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