Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7d7325968e3f1ffe…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:45:40 Authoring application: Microsoft Excel First seen: 2021-09-17
MD5: 8d1c023e8f3f57d1046f605dc502cc90 SHA-1: 921678a9958e3a4bfbff1a89a9a41cc9a992a600 SHA-256: 7d7325968e3f1ffe06526619dfe7df6efdc776843a7f25c940cf4f6b11128ab6
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is a known method for executing malicious code upon opening the workbook. The macro sheet contains a call to a dangerous function, likely intended to execute arbitrary commands. The document body contains obfuscated text, suggesting an attempt to hide the malicious 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) 6414 bytes
SHA-256: c604183ee45a686caaca2148419e545ed5e99bce215091e80a95b934d78638e6
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  LmS
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G197 
' 0018     22 LABEL : Cell Value, String Constant - cddiLKO len=0 
' 0018     21 LABEL : Cell Value, String Constant - eErwXe len=0 
' 0018     23 LABEL : Cell Value, String Constant - EtDZrEQL len=0 
' 0018     25 LABEL : Cell Value, String Constant - hppohYFldW len=0 
' 0018     26 LABEL : Cell Value, String Constant - IzeuPMoxOwY len=0 
' 0018     23 LABEL : Cell Value, String Constant - LNHsgOIz len=0 
' 0018     25 LABEL : Cell Value, String Constant - loguloNxOP len=0 
' 0018     26 LABEL : Cell Value, String Constant - LXLRUuDsJvt len=0 
' 0018     27 LABEL : Cell Value, String Constant - PhpAGFnllpWr len=0 
' 0018     22 LABEL : Cell Value, String Constant - PuiaGwQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - qxSiryzQWD len=0 
' 0018     21 LABEL : Cell Value, String Constant - rmKtdw len=0 
' 0018     26 LABEL : Cell Value, String Constant - sdbkRHrSMFz len=0 
' 0018     21 LABEL : Cell Value, String Constant - SHUZBB len=0 
' 0018     20 LABEL : Cell Value, String Constant - TxBSv len=0 
' 0018     21 LABEL : Cell Value, String Constant - vCtKIW len=0 
' 0018     23 LABEL : Cell Value, String Constant - VdtXKmHJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - WgvKXX len=0 
' 0018     23 LABEL : Cell Value, String Constant - WyAkzCyZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - xFxfCq 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 LABELSS
... (truncated)

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