Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4109541918914a7c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:15 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: 03a70fc479692d687964100287ce41d4 SHA-1: e2b797b3c838bf5cb0fbd7b743069dd0ec3cca58 SHA-256: 4109541918914a7c6e467f1188d45dc3a70cefbe24aeefaf22b96a581f56d176
140 Risk Score

Malware Insights

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

This Excel file contains Excel 4.0 (XLM) macros, specifically an Auto_Open function, which is a known method for executing malicious code. The critical heuristic firings indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting it's designed to run arbitrary commands. The macro sheet itself is named 'dqZzpo', but no specific payload or external communication indicators were extracted.

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) 6596 bytes
SHA-256: 38cdb1001c01460485bc66c3053d72ace78624b7d35d1b4f40548f566d785cc5
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  dqZzp
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H171 
' 0018     20 LABEL : Cell Value, String Constant - BIhRH len=0 
' 0018     24 LABEL : Cell Value, String Constant - bIiTEXdWK len=0 
' 0018     24 LABEL : Cell Value, String Constant - cpRfJxErS len=0 
' 0018     27 LABEL : Cell Value, String Constant - EEpzJcZjHJkR len=0 
' 0018     22 LABEL : Cell Value, String Constant - FlWRjZH len=0 
' 0018     25 LABEL : Cell Value, String Constant - iFtxCSUYeI len=0 
' 0018     24 LABEL : Cell Value, String Constant - kfLqoQGZw len=0 
' 0018     20 LABEL : Cell Value, String Constant - lBFlF len=0 
' 0018     23 LABEL : Cell Value, String Constant - MSJLUxAi len=0 
' 0018     22 LABEL : Cell Value, String Constant - myDxMSl len=0 
' 0018     26 LABEL : Cell Value, String Constant - nRhKNQLwPxy len=0 
' 0018     20 LABEL : Cell Value, String Constant - OvKsc len=0 
' 0018     27 LABEL : Cell Value, String Constant - QfRaobMUWvoA len=0 
' 0018     20 LABEL : Cell Value, String Constant - sXhMY len=0 
' 0018     22 LABEL : Cell Value, String Constant - tJWmeRD len=0 
' 0018     24 LABEL : Cell Value, String Constant - UADXhzTop len=0 
' 0018     20 LABEL : Cell Value, String Constant - VarIn len=0 
' 0018     27 LABEL : Cell Value, String Constant - zaeTSKbbPSGK len=0 
' 0018     22 LABEL : Cell Value, String Constant - zDFfxau len=0 
' 0018     24 LABEL : Cell Value, String Constant - zNbcusrVD 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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