Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 726aad898b579740…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:46:40 Authoring application: Microsoft Excel First seen: 2021-05-22
MD5: 27c361e20f68c8c631b9f5575cb1da4a SHA-1: e0b62fb8a9428942d81ff80672352bec211e58d8 SHA-256: 726aad898b5797407c8fc9d6089cbd9ce748da691782c0dab787d2258375229d
140 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro-enabled workbook containing an Auto_Open function. This function is designed to execute arbitrary code upon opening the document, a common technique for delivering malware. The presence of dangerous formula APIs in the Auto_Open macro indicates a malicious intent to execute commands or download further payloads.

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) 6604 bytes
SHA-256: 60486f21d8d126dd4d8b707befed57c03e16cc2d08e52a103e15a65b83bcacc7
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 -  SazbEki
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E147 
' 0018     25 LABEL : Cell Value, String Constant - fADQzlABAI len=0 
' 0018     26 LABEL : Cell Value, String Constant - GKEKhlChbCf len=0 
' 0018     21 LABEL : Cell Value, String Constant - GptNCt len=0 
' 0018     25 LABEL : Cell Value, String Constant - GWaFbdaSFm len=0 
' 0018     26 LABEL : Cell Value, String Constant - hEDHzdXmQGY len=0 
' 0018     27 LABEL : Cell Value, String Constant - IqbwZhOBwkMv len=0 
' 0018     21 LABEL : Cell Value, String Constant - KxtrZg len=0 
' 0018     25 LABEL : Cell Value, String Constant - oAzCMMIWQt len=0 
' 0018     27 LABEL : Cell Value, String Constant - odqxsIagszqF len=0 
' 0018     26 LABEL : Cell Value, String Constant - pwiUpPZFneo len=0 
' 0018     22 LABEL : Cell Value, String Constant - qDGnBxW len=0 
' 0018     24 LABEL : Cell Value, String Constant - SJysceLcB len=0 
' 0018     25 LABEL : Cell Value, String Constant - SkYwLAbfoT len=0 
' 0018     24 LABEL : Cell Value, String Constant - vhlJjCFks len=0 
' 0018     21 LABEL : Cell Value, String Constant - WAGsTb len=0 
' 0018     21 LABEL : Cell Value, String Constant - wOTWUp len=0 
' 0018     22 LABEL : Cell Value, String Constant - xPMVCDT len=0 
' 0018     24 LABEL : Cell Value, String Constant - xzsUSahZY len=0 
' 0018     23 LABEL : Cell Value, String Constant - zmKCqJFI len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZYJECHHRHXJu 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/ S
... (truncated)

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