Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ddc5d910d5928423…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:38:13 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: df7ca08f7e21eaa6ea95b4265affa4af SHA-1: 51c5c27572779a3bd96276934982eac2e3f53641 SHA-256: ddc5d910d5928423009bc2af5513f9fbc3f5fa87a32a9e5fcdcf35c40eba8dd6
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 indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. While the exact payload is not discernible from the provided evidence, the mechanism points to a macro-based execution of 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) 6825 bytes
SHA-256: a4ce60edbe1e5af5c28e66e3dee7044e7dded8dcd998dac11eb0bd4bcff620fb
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  DLkPqxbvj
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E175 
' 0018     21 LABEL : Cell Value, String Constant - bhBUSr len=0 
' 0018     22 LABEL : Cell Value, String Constant - BRxCQsT len=0 
' 0018     22 LABEL : Cell Value, String Constant - GBQljBr len=0 
' 0018     23 LABEL : Cell Value, String Constant - hITNozuK len=0 
' 0018     21 LABEL : Cell Value, String Constant - JWECkr len=0 
' 0018     21 LABEL : Cell Value, String Constant - LwzQXK len=0 
' 0018     27 LABEL : Cell Value, String Constant - NABlqKSpUYMx len=0 
' 0018     20 LABEL : Cell Value, String Constant - ndwsc len=0 
' 0018     26 LABEL : Cell Value, String Constant - OsapvPANDyS len=0 
' 0018     22 LABEL : Cell Value, String Constant - pVwVPMo len=0 
' 0018     20 LABEL : Cell Value, String Constant - SbNJN len=0 
' 0018     20 LABEL : Cell Value, String Constant - sIayN len=0 
' 0018     27 LABEL : Cell Value, String Constant - sthgQAwFlcEA len=0 
' 0018     24 LABEL : Cell Value, String Constant - SywKfVfQK len=0 
' 0018     22 LABEL : Cell Value, String Constant - UhyCIyu len=0 
' 0018     27 LABEL : Cell Value, String Constant - VCQtbFwbhxbF len=0 
' 0018     21 LABEL : Cell Value, String Constant - vNaNsT len=0 
' 0018     21 LABEL : Cell Value, String Constant - vVszjC len=0 
' 0018     26 LABEL : Cell Value, String Constant - ysFLUVFVBTI len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZTbGIw 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 
... (truncated)

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