Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6d04f1f93e10bba3…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:40:19 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 483ac8290f0b4df24684951ec2035ef3 SHA-1: 983cc8fbb52a137250cce16fe585830c5bb6cf81 SHA-256: 6d04f1f93e10bba3eb6e682171db95d98c0b9348f2bb8ece9f3837161d254137
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-enabled workbook. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The macro likely uses dangerous formula APIs, such as RUN, to execute arbitrary commands, potentially downloading and executing a second-stage 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) 6360 bytes
SHA-256: 629dce36e4508c73f2a0adde2225f06d18e7e705157b6e9e300b38317c0eda95
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  hJiY
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H200 
' 0018     27 LABEL : Cell Value, String Constant - bGotcxCWzbjn len=0 
' 0018     24 LABEL : Cell Value, String Constant - biAFyvBzO len=0 
' 0018     21 LABEL : Cell Value, String Constant - BZjguQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - cWtIVNb len=0 
' 0018     20 LABEL : Cell Value, String Constant - dtizd len=0 
' 0018     26 LABEL : Cell Value, String Constant - DXpCLtMAtej len=0 
' 0018     24 LABEL : Cell Value, String Constant - kJXlhRzXs len=0 
' 0018     24 LABEL : Cell Value, String Constant - MzkcLOKdf len=0 
' 0018     20 LABEL : Cell Value, String Constant - Nyucm len=0 
' 0018     21 LABEL : Cell Value, String Constant - oomJbe len=0 
' 0018     20 LABEL : Cell Value, String Constant - OUlgI len=0 
' 0018     20 LABEL : Cell Value, String Constant - pmuAW len=0 
' 0018     25 LABEL : Cell Value, String Constant - UggvEuBbwh len=0 
' 0018     22 LABEL : Cell Value, String Constant - UyFeqtS len=0 
' 0018     25 LABEL : Cell Value, String Constant - vekCCksosG len=0 
' 0018     20 LABEL : Cell Value, String Constant - vPJQb len=0 
' 0018     25 LABEL : Cell Value, String Constant - WNXiOjcQEV len=0 
' 0018     22 LABEL : Cell Value, String Constant - wvmTtQH len=0 
' 0018     20 LABEL : Cell Value, String Constant - xaGqx len=0 
' 0018     22 LABEL : Cell Value, String Constant - yDpDYMU 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 Va
... (truncated)

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