Malicious RTF — malware analysis report

Static analysis result for SHA-256 2eddb8f6d3cf5101…

MALICIOUS

RTF

1001.6 KB Created: 2018-03-22 First seen: 2018-03-30
MD5: 1a77516842d1d471021aacce298d39e3 SHA-1: 317369b3dca0e8bb1217a7f9547dd7bf6fe50961 SHA-256: 2eddb8f6d3cf5101e5b3b74588f101168b2d4d82493b25b873a9b861dbb0df71
262 Risk Score

Malware Insights

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

The RTF file contains multiple embedded OLE objects and triggers an ".objupdate" command, which is indicative of exploiting vulnerabilities like CVE-2017-8759 for client execution. ClamAV detections further confirm its malicious nature, flagging it as Doc.Macro.Obfuscation. The primary attack vector is likely spearphishing attachment, with the embedded OLE object serving as the mechanism to download and execute a secondary payload.

Heuristics 6

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • ClamAV: Xls.Downloader.Generic-6750544-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Generic-6750544-0
  • \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 12 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — 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 http://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 12

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002c48.bin rtf-objdata-decoded RTF \objdata at offset 0x2C48 28731 bytes
SHA-256: 569271969cadd41b995937354a37d523b0bd4c91d7f8247a388a3794ea6d0d89
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_01_off00016c8f.bin rtf-objdata-decoded RTF \objdata at offset 0x16C8F 28731 bytes
SHA-256: 210b747a7e1dd102d0c86201a349f4b5d1fd7c64b0a1c0dc10dbc97cdaa9448c
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_02_off0002acd6.bin rtf-objdata-decoded RTF \objdata at offset 0x2ACD6 28731 bytes
SHA-256: 202b9f829c5a708602eb72e227ac69cddcbac39fc4b50529ee03c4b68d574d9b
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_03_off0003ed1d.bin rtf-objdata-decoded RTF \objdata at offset 0x3ED1D 28731 bytes
SHA-256: 3893e4224a1d0f23262834bbf993597b8134dc3a24500bada4ca3e05332af5eb
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_04_off00052d64.bin rtf-objdata-decoded RTF \objdata at offset 0x52D64 28731 bytes
SHA-256: 88d33497d4c5ea801b54c350c64de869b8eee5fe9652b863eec70327e4ada4f3
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_05_off00066dab.bin rtf-objdata-decoded RTF \objdata at offset 0x66DAB 28731 bytes
SHA-256: 108b4b99ac1d7dac410a791dcc7724ebaf8c898f6c2a509597d7edec1a0a08d0
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_06_off0007ae3e.bin rtf-objdata-decoded RTF \objdata at offset 0x7AE3E 28731 bytes
SHA-256: 2b6a5990ad3927368933beee599d7e8a44051df4b5a50b8edfaa805c34c9b9b8
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_07_off0008ee85.bin rtf-objdata-decoded RTF \objdata at offset 0x8EE85 28731 bytes
SHA-256: 2408e25c8d4965b4c0596d0d13b8b3b10a41dab23d988685e857bcda4662efb2
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_08_off000a2ecc.bin rtf-objdata-decoded RTF \objdata at offset 0xA2ECC 28731 bytes
SHA-256: d071555cba14d22a0b5869b17a26a6258a5a21233e94e1acd80a7c8f929598f5
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_09_off000b6f13.bin rtf-objdata-decoded RTF \objdata at offset 0xB6F13 28731 bytes
SHA-256: 4db6c909cff9a6cdc85ecf2547e72ec0e514f1546ae1328265709265ec3a1674
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_10_off000caf5a.bin rtf-objdata-decoded RTF \objdata at offset 0xCAF5A 28731 bytes
SHA-256: 5db63faee041967e80fee32d2a9e15edb68feef41a62c683f5786180e1963cfd
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_11_off000defa1.bin rtf-objdata-decoded RTF \objdata at offset 0xDEFA1 28731 bytes
SHA-256: e558a12c79fd8500e5ca75690c16c03a2689e0c5406f0e1acd5aa0b70309a7fa
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely

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