Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 0f7d55460ec53930…

MALICIOUS

Office (OOXML)

26.0 KB First seen: 2019-04-18
MD5: da6d20761219f9404ca967d9bbdee701 SHA-1: dc7fe1ede8e510f39b545dd58236b8886376ecc1 SHA-256: 0f7d55460ec53930deb4f882a6212b439fded654c5c6464aa4d0ff06bf7a0389
102 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample contains an embedded OLE object identified as an Equation Editor object, which is associated with CVE-2018-0798. This indicates an attempt to exploit a client-side vulnerability for code execution. The presence of an embedded URL suggests a potential secondary stage or lure, though its reputation is unknown.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/EMBEddings/oLeOBJect1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • 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 https://kes.fxexchangerate.com/ugx/1200-currency-rates.html In document text (OOXML body / shared strings)
    • https://exchangerate.guru/kes/ugx/1200/In document text (OOXML body / shared strings)
    • https://coinmill.com/KES_UGX.htmlIn document text (OOXML body / shared strings)
    • https://kes.currencyrate.todayIn document text (OOXML body / shared strings)
    • https://www.exchange-rates.org/Rate/KES/UGXIn document text (OOXML body / shared strings)
    • https://www.xe.com/currencyconverter/convert/?Amount=1&From=UGX...KESIn document text (OOXML body / shared strings)
    • https://moneyexchangerate.org/currencyexchange/ugx/kes/1250In document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: xl/EMBEddings/oLeOBJect1.bin 4096 bytes
SHA-256: f9e6b0c8ed11aa8fde7e390f82dfdf397856c15dcd1e75cd914cc3f2ef3e1a98
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/EMBEddings/oLeOBJect1.bin Ole10Native stream: OLe10nAtIvE 1785 bytes
SHA-256: c5af2ec2c91f53caca3528d3ea27e063d3930f389c29bbdc6cd5af4e0e226e93

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