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Windows
Analysis Report
YSpCB8DEek.exe
Overview
General Information
| Sample Name: | YSpCB8DEek.exe |
| Original Sample Name: | d927de8cecb8523b956d2bb2098d20ef.exe |
| Analysis ID: | 825979 |
| MD5: | d927de8cecb8523b956d2bb2098d20ef |
| SHA1: | cb01b1c8bea968c8919c7303d10ec5b4c520691c |
| SHA256: | e2f96798a7d58ac8a06c39d4459336c8fddafec67fe12cda3c9d4e497702601f |
| Tags: | 32exetrojan |
| Infos: |  |
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Detection
FormBook
| Score: | 100 |
| Range: | 0 - 100 |
| Whitelisted: | false |
| Confidence: | 100% |
Signatures
Multi AV Scanner detection for submitted file
Yara detected FormBook
Malicious sample detected (through community Yara rule)
System process connects to network (likely due to code injection or exploit)
Antivirus detection for URL or domain
Antivirus detection for dropped file
Multi AV Scanner detection for dropped file
Sample uses process hollowing technique
Maps a DLL or memory area into another process
Machine Learning detection for sample
Modifies the prolog of user mode functions (user mode inline hooks)
Found evasive API chain (may stop execution after reading information in the PEB, e.g. number of processors)
Queues an APC in another process (thread injection)
Tries to detect virtualization through RDTSC time measurements
Modifies the context of a thread in another process (thread injection)
C2 URLs / IPs found in malware configuration
Uses 32bit PE files
Yara signature match
Antivirus or Machine Learning detection for unpacked file
Contains functionality to check if a debugger is running (IsDebuggerPresent)
Contains functionality to query locales information (e.g. system language)
May sleep (evasive loops) to hinder dynamic analysis
Contains functionality to shutdown / reboot the system
Uses code obfuscation techniques (call, push, ret)
Internet Provider seen in connection with other malware
Detected potential crypto function
Found potential string decryption / allocating functions
Sample execution stops while process was sleeping (likely an evasion)
Found evasive API chain (may stop execution after checking a module file name)
Contains functionality to call native functions
Contains functionality to dynamically determine API calls
HTTP GET or POST without a user agent
Contains functionality which may be used to detect a debugger (GetProcessHeap)
IP address seen in connection with other malware
Contains functionality for execution timing, often used to detect debuggers
Enables debug privileges
Creates a DirectInput object (often for capturing keystrokes)
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Found inlined nop instructions (likely shell or obfuscated code)
Drops PE files
Contains functionality to read the PEB
Checks if the current process is being debugged
Dropped file seen in connection with other malware
Found large amount of non-executed APIs
Creates a process in suspended mode (likely to inject code)
Contains functionality to access loader functionality (e.g. LdrGetProcedureAddress)
Contains functionality for read data from the clipboard
Classification
- System is w10x64
YSpCB8DEek.exe (PID: 5880 cmdline: C:\Users\u ser\Deskto p\YSpCB8DE ek.exe MD5: D927DE8CECB8523B956D2BB2098D20EF) 
afhjjq.exe (PID: 4088 cmdline: "C:\Users\ user\AppDa ta\Local\T emp\afhjjq .exe" C:\U sers\user\ AppData\Lo cal\Temp\a reuvasydgv .tlq MD5: 6C148CA1A207DD5BE97C1726A9F4BABF) - afhjjq.exe (PID: 2236 cmdline:
C:\Users\u ser\AppDat a\Local\Te mp\afhjjq. exe MD5: 6C148CA1A207DD5BE97C1726A9F4BABF) 
explorer.exe (PID: 3324 cmdline: C:\Windows \Explorer. EXE MD5: AD5296B280E8F522A8A897C96BAB0E1D) 
control.exe (PID: 4980 cmdline: C:\Windows \SysWOW64\ control.ex e MD5: 40FBA3FBFD5E33E0DE1BA45472FDA66F) 
cmd.exe (PID: 5280 cmdline: /c del "C: \Users\use r\AppData\ Local\Temp \afhjjq.ex e" MD5: F3BDBE3BB6F734E357235F4D5898582D) - conhost.exe (PID: 1352 cmdline:
C:\Windows \system32\ conhost.ex e 0xffffff ff -ForceV 1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
- cleanup
| Name | Description | Attribution | Blogpost URLs | Link |
|---|---|---|---|---|
| Formbook, Formbo | FormBook contains a unique crypter RunPE that has unique behavioral patterns subject to detection. It was initially called "Babushka Crypter" by Insidemalware. |
{"C2 list": ["www.n7m.tokyo/nes8/"], "decoy": ["simantsfamily.com", "ninobrowndelivery.net", "y94x.info", "huibi01.vip", "davidspanu.com", "swegon.tech", "moapulsa.com", "coveredseguros.com", "owltoon.site", "loyalguardianop.com", "banca-particulares.icu", "innovativanimal.com", "girlschools.top", "smartbed-gb-tok.life", "vhail.store", "bluffdalecitizens.info", "asmcpn.us", "wordybag.online", "smmfsa.com", "jinglunqhd.com", "mybestfurend.com", "hatmam.com", "kruz56.site", "drinkarakay.com", "linnus.shop", "shockgods.net", "adammushrooms.com", "enakslot.net", "tt0738.com", "vivre-lyon7.com", "oticascarol.live", "precisionradiologyin.com", "prvtg.top", "naturetechvr.com", "thegoodfunguy.com", "soulcommunication.site", "hallmarklog.live", "cantonbourbonroom.com", "mitsubishixpander.com", "dgrjzz1688.com", "rainbow-bridge.xyz", "yaxin376.com", "sonrisasica.com", "letterkennytown.com", "kkkrobesforwhitesonly.com", "mikamiyua.xyz", "navigatoral.ltd", "dailyhoroscope4you.space", "dietoll-official.site", "hadafsazan.net", "mommysleepswithers.com", "abc-notation.com", "tbsc766.store", "marketproinv.info", "culdshn.pics", "oxylabs.top", "incentiveexcellence.com", "sarodret.buzz", "weplaycrypto.net", "purityrecruitment.com", "s95wh.icu", "voip-59118.com", "righttowrescue.com", "feffco.xyz"]}| Source | Rule | Description | Author | Strings |
|---|---|---|---|---|
| JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security | ||
| JoeSecurity_FormBook | Yara detected FormBook | Joe Security | ||
| Windows_Trojan_Formbook_1112e116 | unknown | unknown |
| |
| Formbook_1 | autogenerated rule brought to you by yara-signator | Felix Bilstein - yara-signator at cocacoding dot com |
| |
| Formbook | detect Formbook in memory | JPCERT/CC Incident Response Group |
| |
| Click to see the 33 entries | ||||
| Source | Rule | Description | Author | Strings |
|---|---|---|---|---|
| JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security | ||
| JoeSecurity_FormBook | Yara detected FormBook | Joe Security | ||
| Windows_Trojan_Formbook_1112e116 | unknown | unknown |
| |
| Formbook_1 | autogenerated rule brought to you by yara-signator | Felix Bilstein - yara-signator at cocacoding dot com |
| |
| Formbook | detect Formbook in memory | JPCERT/CC Incident Response Group |
| |
| Click to see the 15 entries | ||||
⊘No Sigma rule has matched
⊘No Snort rule has matched
Click to jump to signature section
Show All Signature Results
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| Source: | Code function: | 0_2_00405D74 | |
| Source: | Code function: | 0_2_0040699E | |
| Source: | Code function: | 0_2_0040290B | |
| Source: | Code function: | 2_2_00417284 | |
| Source: | Code function: | 2_2_00407B1A | |
| Source: | Code function: | 2_2_00417D32 | |
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| Source: | Network Connect: | Jump to behavior | ||
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