Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 41c97648a102d094…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:44:12 Authoring application: Microsoft Excel First seen: 2021-07-07
MD5: 16d56bd46ba30affee8d707b6dd76055 SHA-1: b46716630d607ba0758feed9751d4bf416617b18 SHA-256: 41c97648a102d094ab1d8187481b3a1c7bc5054dfd79dc88e1e79356d6e10f9e
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a critical finding. The presence of dangerous formula APIs like RUN indicates that the macro is designed to execute arbitrary commands. This functionality is commonly used to download and execute further malicious 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) 6526 bytes
SHA-256: 1aa945a538ab9bd0c4bbb4949ee048caa77255e9203656cef602471f490e1611
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 -  WqZiFeG
' 0018     25 LABEL : Cell Value, String Constant - AovzAPSkQU len=0 
' 0018     25 LABEL : Cell Value, String Constant - AsSxPbhIUz len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H143 
' 0018     21 LABEL : Cell Value, String Constant - CAOwCI len=0 
' 0018     25 LABEL : Cell Value, String Constant - fUiYkPlWmC len=0 
' 0018     20 LABEL : Cell Value, String Constant - GgWrp len=0 
' 0018     25 LABEL : Cell Value, String Constant - kbSgITdDHi len=0 
' 0018     20 LABEL : Cell Value, String Constant - kJhxV len=0 
' 0018     27 LABEL : Cell Value, String Constant - MNNxSZytVenP len=0 
' 0018     21 LABEL : Cell Value, String Constant - phOtVn len=0 
' 0018     21 LABEL : Cell Value, String Constant - PmGJZY len=0 
' 0018     20 LABEL : Cell Value, String Constant - QHOzF len=0 
' 0018     26 LABEL : Cell Value, String Constant - rbCFVdYzBpe len=0 
' 0018     21 LABEL : Cell Value, String Constant - SjuiOd len=0 
' 0018     26 LABEL : Cell Value, String Constant - SjuLBPsrSnM len=0 
' 0018     21 LABEL : Cell Value, String Constant - TZaRse len=0 
' 0018     23 LABEL : Cell Value, String Constant - vKShXapg len=0 
' 0018     25 LABEL : Cell Value, String Constant - VMVUbwIehe len=0 
' 0018     23 LABEL : Cell Value, String Constant - VtIgcKJP len=0 
' 0018     27 LABEL : Cell Value, String Constant - wUqGfxIfhDGS len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZSowee 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 LA
... (truncated)

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