Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 aa834469b68a2bde…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:39:01 Authoring application: Microsoft Excel First seen: 2021-06-04
MD5: 1aa21611f0f061e0fed01ecc7f6e0eb0 SHA-1: bb54cfadc847d533e820136f92751b9be1a57c6e SHA-256: aa834469b68a2bde3f071b383fcbd8e2180880ee93d8e1643ad162c6e4521a19
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 containing an Auto_Open function, which is a common technique for executing malicious code upon opening. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands or download further payloads. While no specific URLs or hashes were extracted, the macro's structure strongly suggests it's designed to initiate a malicious process.

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) 6713 bytes
SHA-256: 20b85b8f99aff3770467d08bcc5f9a6e6079c3c4c8de58d8518a11ed9ceeac1e
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xQFXIrISEN
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F185 
' 0018     25 LABEL : Cell Value, String Constant - biIyWqCpEw len=0 
' 0018     25 LABEL : Cell Value, String Constant - BSPldqonkY len=0 
' 0018     21 LABEL : Cell Value, String Constant - BvEnvp len=0 
' 0018     20 LABEL : Cell Value, String Constant - EEJtm len=0 
' 0018     23 LABEL : Cell Value, String Constant - FqCWErod len=0 
' 0018     23 LABEL : Cell Value, String Constant - GZGuTbrh len=0 
' 0018     25 LABEL : Cell Value, String Constant - lboKkOoweA len=0 
' 0018     25 LABEL : Cell Value, String Constant - MQpqgFELXQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - pFYgQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - pmwSbNsu len=0 
' 0018     26 LABEL : Cell Value, String Constant - qTuqjXYdBfN len=0 
' 0018     26 LABEL : Cell Value, String Constant - qxWqrjntpvw len=0 
' 0018     25 LABEL : Cell Value, String Constant - SvlycISKrn len=0 
' 0018     23 LABEL : Cell Value, String Constant - TNrgoiWt len=0 
' 0018     27 LABEL : Cell Value, String Constant - UcojpjyAtmcE len=0 
' 0018     26 LABEL : Cell Value, String Constant - UVhnInVRSor len=0 
' 0018     23 LABEL : Cell Value, String Constant - WWKolZFJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - YRNRWDSvUlx len=0 
' 0018     23 LABEL : Cell Value, String Constant - ySkjMClK len=0 
' 0018     27 LABEL : Cell Value, String Constant - zapPkZbPsqjE 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)

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