Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 2770e4dfaee773b6…

MALICIOUS

Office (OOXML)

15.7 KB Created: 2018-05-08 08:57:10 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2019-06-27
MD5: abad135f8929580dc09b190a47c6c111 SHA-1: 467d0fbc60743e12abbb538705b32569e0c1733b SHA-256: 2770e4dfaee773b6ea2318adc944281e10ae16240b3c93757ab517bf4f02c495
220 Risk Score

Malware Insights

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

The file is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate this object is anomalous and exploits CVE-2018-0798, a known vulnerability allowing for client execution. ClamAV detections confirm the malicious nature, identifying it as a dropper. The document body appears to be a legitimate-looking room list, likely a lure to encourage opening the malicious attachment.

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.
  • ClamAV: Doc.Dropper.Agent-7382280-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-7382280-0
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

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: 50a9b0fecb3a072e49e92fea9a9617e99452ccb0db9057a31dd4ad1094dcd83b
Detection
ClamAV: Doc.Dropper.Agent-7382280-0
Obfuscation or payload: unlikely
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10native 1573 bytes
SHA-256: d0bc76d52de2cf6af4817951b18b546293af9972ce80e3ebebfdc653a9193fcc

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