Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 7fa2b0707e132f23…

MALICIOUS

RTF / .DOC

1.77 MB
MD5: 67445b6530b2a309b6941107c83214c0 SHA-1: 06a7f130bef4fd62dd291187b9414eb4b63c74cb SHA-256: 7fa2b0707e132f23fb58b562386fb691d6ebe35294f93f68be1de43297af1c30
180 Risk Score

Malware Insights

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

The RTF document contains multiple indicators of exploitation, specifically related to CVE-2017-11882 through the Equation Editor. The presence of OLE object data and explicit firings for RTF_EQUATION_EDITOR and CVE_2017_11882_ACTIVATION_RELATED strongly suggest this vulnerability is being leveraged. The ".objupdate" directive further indicates an attempt to force OLE object activation, leading to code execution.

Heuristics 5

  • 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 2 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000011e1.bin
b5d7c994e41accbc7d0095481df28a2ee2cf086bc473acfd967b52f259bacc4d		 rtf-objdata-decoded RTF \objdata at offset 0x11E1 54109 bytes
objdata_01_off0002feed.bin
a3c4dea994dc8ee11a4f63de30f7dfa57dd55c2b1c12c19d818507bc177d14a2		 rtf-objdata-decoded RTF \objdata at offset 0x2FEED 452820 bytes

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