Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0b1002c46c9adc84…

MALICIOUS

Office (OLE)

339.0 KB Created: 2020-07-10 10:41:45 Authoring application: Microsoft Excel First seen: 2020-09-15
MD5: f367db2c66ac893858edef7728c94b30 SHA-1: 465f0c5eb19975cd155e2c7c93c3917b9c49db15 SHA-256: 0b1002c46c9adc846e110d4c523f52f58ce965eed27089b1c395333a41ff55f2
182 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, including an Auto_Open function, which is a critical finding. The macros utilize dangerous formula APIs, specifically the RUN function, indicating an intent to execute arbitrary code. The presence of a macro-enable lure further supports the malicious intent. While specific IOCs are limited to benign URLs, the overall structure and heuristic firings strongly suggest a downloader or initial execution stage of a malware infection.

Heuristics 6

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns# In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/In document text (OLE body)

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) 90776 bytes
SHA-256: 82b3b451fdca4a1d113c54773b2c7f6a5ab1517d594af50ec0d2ae87c8b8d078
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, very hidden -  Sheet
' 0085     11 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  aV
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     19 LABEL : Cell Value, String Constant - aaYd len=0 
' 0018     57 LABEL : Cell Value, String Constant - ablJEgiPVowmSNOMRCJQgIHXNPHgJnlUIdTKYiRREE len=0 
' 0018     35 LABEL : Cell Value, String Constant - afQJQuWHXbdVuXCmhWqh len=0 
' 0018     40 LABEL : Cell Value, String Constant - aPMGYVsOmsoBESnpyJEgwPjDw len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!S25974 
' 0018     27 LABEL : Cell Value, String Constant - aZdPIPtUGWZc len=0 
' 0018     16 LABEL : Cell Value, String Constant - b len=0 
' 0018     22 LABEL : Cell Value, String Constant - BalfxuS len=0 
' 0018     29 LABEL : Cell Value, String Constant - bBMGYIeOZfbmES len=0 
' 0018     56 LABEL : Cell Value, String Constant - BBzFpwEUutKzDuTwbZHvQHxLVEErrSbnQjPmFRFDw len=0 
' 0018     21 LABEL : Cell Value, String Constant - BGDORg len=0 
' 0018     52 LABEL : Cell Value, String Constant - bJMgJNbYHUttVdpSlRoHgHSMeOkUfkhsKYghq len=0 
' 0018     17 LABEL : Cell Value, String Constant - BK len=0 
' 0018     59 LABEL : Cell Value, String Constant - bkupTiBVoiYENOMRCuCgtsJMPHgunYGIcFKXiDQEpRnm len=0 
' 0018     57 LABEL : Cell Value, String Constant - bnCjBmqRFDwPMiEdifqtJefoytXmGZsncIRSQVGyGk len=0 
' 0018     57 LABEL : Cell Value, String Constant - BobCYXygxkoOoztMJfCaSOaqGbPYvqUWDXckZFOPNS len=0 
' 0018     26 LABEL : Cell Value, String Constant - BoJzqFPxxkk len=0 
' 0018     47 LABEL : Cell Value, String Constant - bpziiVIiFSgNfRVuigaspMiHNJUXmIJT len=0 
' 0018     23 LABEL : Cell Value, String Constant - BQHJBaDh len=0 
' 0018     27 LABEL : Cell Value, String Constant - BRjEXRHmuvty len=0 
' 0018     55 LABEL : Cell Value, String Constant - BTCZJTZVhxNUWfDxbdKQjrgNIIHMwELbCBRHKCaE len=0 
' 0018     55 LABEL : Cell Value, String Constant - bVnkIdCIEQThDFOYTvMeySMChqqpufYfKXWmpskJ len=0 
' 0018     30 LABEL : Cell Value, String Constant - BwILavwH len=7 ptgRef3d  Sheet!O28319 
' 0018     22 LABEL : Cell Value, String Constant - BxgtTTu len=0 
' 0018     58 LABEL : Cell Value, String Constant - BYGiyflFNCiddchSLSwXJZcfXvZEnjYsjanxggUGhEQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - BYqQqCvOxU len=0 
' 0018     46 LABEL : Cell Value, String Constant - bzrozRfBoxWRtvcwCKzfoonsPWdIVUk len=0 
' 0018     52 LABEL : Cell Value, String Constant - CDMWRuKdwQLzfopnsdWdIVUkoqiIXPzhjEgly len=0 
' 0018     26 LABEL : Cell Value, String Constant - cFmEptTtFyR len=0 
' 0018     38 LABEL : Cell Value, String Constant - cgiazPHrZbwZdrCWkXKkHGi len=0 
' 0018     62 LABEL : Cell Value, String Constant - ChddcgSYfwXWmcfXvZECjYsiZnxggTTuEQrMqPhsheYqnLu len=0 
' 0018     58 LABEL : Cell Value, String Constant - chepHIdenMsWlSYrzpVQRPUFxFjKvMQSKjMqbWLfWNa len=0 
' 0018     56 LABEL : Cell Value, String Constant - ciCKzfabZePWdtVUkacUtWByhVqgXlveeRRsBOpJo len=0 
' 0018     19 LABEL : Cell Value, String Constant - ciep len=0 
' 0018     36 LABEL : Cell Value, String Constant - CIEQThDFOYTwMeySMChqq len=0 
' 0018     23 LABEL : Cell Value, String Constant - cjNoZptw len=0 
' 0018     51 LABEL : Cell Value, String Constant - cLLxxZhuWpVtLXLJDVSoYjplwOPklvTzdsZg len=0 
' 0018     26 LABEL : Cell Value, String Constant - ClUWqTYliRe len=0 
' 0018     24 LABEL : Cell Value, String Constant - cnspBSTop len=0 
' 0018     62 LABEL : Cell Value, String Constant - CVBZqDqoiBxUEPVRctuQRbyfJYFMemcIDECHslsWxiyDGwW len=0 
' 0018     45 LABEL : Cell Value, String Constant - cVcHhTjmphGjOytiDtkxIrqeQrOaoW len=0 
' 0018     17 LABEL : Cell Value, String Constant - cX len=0 
' 0018     59 LABEL : Cell Value, String Constant - cxyJSNqGZtMHvbkljoZTaERQgkneETLvdfBdhvGaobOo len=0 
' 0018     49 LABEL : Cell Value, String Constant - cyUslhsKYthrPKnoVpuDsYhiglJPWBONdg len=0 
' 0018     20 LABEL : Cell Value, String Constant - CyVFQ len=0 
' 0018     23 LABEL :
... (truncated)

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