Malicious RTF — malware analysis report

Static analysis result for SHA-256 d8be93b858f4ddfe…

MALICIOUS

RTF

435.9 KB Created: 2020-04-14 22:43:00
MD5: 2907fc0663fc11e3fc8b157aef87e7c6 SHA-1: 67e4d529c5906dc0d44d7db2dfe25810ad88c74e SHA-256: d8be93b858f4ddfe0f6dab717e269665a56d862b86781da908fafa31be2ec509
120 Risk Score

Malware Insights

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

The RTF file contains multiple OLE objects, with one specifically identified as a Package object. The presence of \objupdate directives strongly suggests an attempt to automatically activate these embedded objects, likely exploiting a vulnerability to execute arbitrary code. While the specific exploit is not detailed, the overall pattern points to a malicious RTF document designed for exploitation.

Heuristics 4

  • \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.
  • Package object class high RTF_OBJCLASS_PACKAGE
    OLE Package object — can wrap arbitrary files
  • OLE object data medium RTF_OBJDATA
    RTF contains 5 \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_off00002601.bin
118bf155d3d9071a0735a90f4a16d88cb3bb125f5b26c0cd390a238f86e84550
rtf-objdata-decoded RTF \objdata at offset 0x2601 35899 bytes