Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 389f0afe4c8c2f47…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:38:17 Authoring application: Microsoft Excel First seen: 2021-07-02
MD5: c06e18ce7fa906e1a76726abe922a389 SHA-1: f665cf5b4284b7af38fa7d49702156a67bffe693 SHA-256: 389f0afe4c8c2f470c265de5a9b854a2298cb9755dc253a97caa84fc3c69a9b3
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating potential malicious execution. The presence of dangerous formula APIs within the XLM macro further increases the risk. While the exact payload is not discernible from the provided evidence, the Auto_Open function strongly suggests an attempt to automatically execute code upon opening the document, likely as part of a spearphishing attachment.

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) 6667 bytes
SHA-256: 7ac9ead19dca448d3646b6339339e3949858c740f4fe9ea3e1fd27b33f85ae0b
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 -  PRN
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G160 
' 0018     21 LABEL : Cell Value, String Constant - cMggBj len=0 
' 0018     25 LABEL : Cell Value, String Constant - CXXXfFjsPv len=0 
' 0018     21 LABEL : Cell Value, String Constant - eDiLUY len=0 
' 0018     27 LABEL : Cell Value, String Constant - FlRGHlclbBxE len=0 
' 0018     27 LABEL : Cell Value, String Constant - GzWeFTAhEDgc len=0 
' 0018     22 LABEL : Cell Value, String Constant - hiVZPzr len=0 
' 0018     23 LABEL : Cell Value, String Constant - jDMWprsY len=0 
' 0018     21 LABEL : Cell Value, String Constant - mEYfdi len=0 
' 0018     21 LABEL : Cell Value, String Constant - pxkJcP len=0 
' 0018     26 LABEL : Cell Value, String Constant - QjeLABvTpya len=0 
' 0018     27 LABEL : Cell Value, String Constant - qJWTMvfDXpzy len=0 
' 0018     23 LABEL : Cell Value, String Constant - sHQBwIvr len=0 
' 0018     20 LABEL : Cell Value, String Constant - tkGxp len=0 
' 0018     27 LABEL : Cell Value, String Constant - TMoPNzOxLfvX len=0 
' 0018     20 LABEL : Cell Value, String Constant - UfTRU len=0 
' 0018     25 LABEL : Cell Value, String Constant - vfwmDrGfFT len=0 
' 0018     26 LABEL : Cell Value, String Constant - vMnSjIynvze len=0 
' 0018     21 LABEL : Cell Value, String Constant - YgECGd len=0 
' 0018     20 LABEL : Cell Value, String Constant - zbuJI len=0 
' 0018     22 LABEL : Cell Value, String Constant - ztLEuxV 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 LABE
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.