Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 db46ba6c7bccd43b…

MALICIOUS

RTF / .DOC

24.7 KB First seen: 2022-06-15
MD5: e863c296b56a2186b662b7cce8e4aaa5 SHA-1: e2a938039727556791a58e303bbf3acce27082e5 SHA-256: db46ba6c7bccd43b5a5ecb729ef23dfa58fbcd8ee7720a15696f33ace895522f
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains a malicious Equation Editor OLE object, specifically exploiting CVE-2017-11882. This technique is commonly used to embed and execute arbitrary code. The presence of the Ole10Native stream and the objupdate heuristic indicate that the embedded object is designed to be activated, likely leading to the execution of a second-stage payload.

Heuristics 6

  • Equation Editor Ole10Native payload — CVE-2017-11882 likely critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    RTF decodes to an activated Microsoft Equation 3.0 OLE storage whose payload is a high-entropy Ole10Native stream rather than normal Equation Native/MTEF data. This is a weaponized Equation Editor RCE delivery shape consistent with CVE-2017-11882/CVE-2018-0802.
  • Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM
    RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001d79.bin
a782608b2af60d302bae9afeac7a40ac4daa143ab4673246e7711b5662faf759		 rtf-objdata-decoded RTF \objdata at offset 0x1D79 4293 bytes

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