Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 6a44af7a50651c01…

MALICIOUS

RTF / .DOC

2.01 MB
MD5: 3abb7b2a690bf111dc8f8e9a48703394 SHA-1: 41f2d13f5f7c7426d8e333ee44b8b0e78117ee7f SHA-256: 6a44af7a50651c01a094802fc6ffe4df30d8a7cae342118220436b81683d967b
200 Risk Score

Malware Insights

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

The sample is an RTF document that leverages the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for the execution of embedded OLE objects. The presence of ".zip.vbs" in the decoded object data suggests the embedded object is likely a VBScript designed to download and execute further payloads, potentially related to a ZIP archive.

Heuristics 6

  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • \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 3 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000aa7.bin
bada11f4d12bc134b3f907694a4c4ee0e2445be1ff188984576cce582a447f5c		 rtf-objdata-decoded RTF \objdata at offset 0xAA7 12495 bytes
objdata_01_off0000756d.bin
0c2a22f029f1ef83fe6a8bec029e3390200470adfcc71b8a1265359ec000b38f		 rtf-objdata-decoded RTF \objdata at offset 0x756D 126 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).
objdata_02_off00008426.bin
918d2910941f12448bb56c0af7213b9625e3df36637eae6ad86a5922821f9dfb		 rtf-objdata-decoded RTF \objdata at offset 0x8426 566196 bytes

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