Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3b7005f4df544bd0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:23 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: 1307feddabeecfc116eb85c2f52a0b97 SHA-1: 4c23458fa0c64fd72f6924b83f6a7ecb03d607b9 SHA-256: 3b7005f4df544bd02578e0bd72cda1567c0cc5970df921223d94613658ee30ac
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 sheet containing an Auto_Open function, which is a common technique for executing malicious code upon opening the workbook. The presence of dangerous formula APIs in the Auto_Open macro indicates a high likelihood of malicious intent. While the specific payload is not directly visible, the mechanism strongly suggests an attempt to execute arbitrary code.

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) 6909 bytes
SHA-256: 723b4d99b6c596d3733190d6931ba0c112cbd3d72af7619cb39b2c58c8c09ef2
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  vTqwFshmUoL
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B168 
' 0018     26 LABEL : Cell Value, String Constant - czXxgppaOWJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - GsbKaNUKYa len=0 
' 0018     25 LABEL : Cell Value, String Constant - hkZPKDpDlX len=0 
' 0018     27 LABEL : Cell Value, String Constant - izEQKdfBtDQB len=0 
' 0018     25 LABEL : Cell Value, String Constant - jCfyRAYSNy len=0 
' 0018     27 LABEL : Cell Value, String Constant - kJZvBUJngrTW len=0 
' 0018     27 LABEL : Cell Value, String Constant - krYvAOoviFmd len=0 
' 0018     21 LABEL : Cell Value, String Constant - lKdknE len=0 
' 0018     20 LABEL : Cell Value, String Constant - LkfBZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - muqOF len=0 
' 0018     26 LABEL : Cell Value, String Constant - nNjdFqgksBv len=0 
' 0018     21 LABEL : Cell Value, String Constant - OpUsUB len=0 
' 0018     25 LABEL : Cell Value, String Constant - PMvChfVVMd len=0 
' 0018     25 LABEL : Cell Value, String Constant - tdpAFfuVEs len=0 
' 0018     23 LABEL : Cell Value, String Constant - vFmvPEJb len=0 
' 0018     22 LABEL : Cell Value, String Constant - vhBYwXU len=0 
' 0018     27 LABEL : Cell Value, String Constant - VwTbOnBMCEat len=0 
' 0018     22 LABEL : Cell Value, String Constant - walQJfC len=0 
' 0018     21 LABEL : Cell Value, String Constant - WDNWFL len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZHqSUYgZOe 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/
... (truncated)

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