MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b4fbe906439597a3d05b94f3a7001069687e598cabc9a82e47d6c43046be10a5. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.

Database Entry


RevCodeRAT


Vendor detections: 9


Intelligence 9 IOCs YARA 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b4fbe906439597a3d05b94f3a7001069687e598cabc9a82e47d6c43046be10a5
SHA3-384 hash: 2fa56a2565a798930ba480e489169c48761c4d56aaa29afb767b7315d8bbea8fe27ae5b7cfdee7b8896945b76b4ab59a
SHA1 hash: ff9535613f977f6321a1eca20c50e97d23c83259
MD5 hash: f7d79ec6a3bf524f8f0c0e8d54949948
humanhash: fanta-delta-coffee-cola
File name:JANUARY OVERDUE INVOICE.pdf.exe
Download: download sample
Signature RevCodeRAT
Create hunting rule
File size:1'578'496 bytes
First seen:2021-04-07 05:15:00 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'652 x AgentTesla, 19'463 x Formbook, 12'205 x SnakeKeylogger)
ssdeep 24576:0mGvjB51sSNvDZwEap6P47H4WN254RAebqWZstqhrpHTbXeUfOu82:KjTtwEWzRz6ebqMr9nu0Z8
Threatray 48 similar samples on MalwareBazaar
TLSH A07512223245DF4AE03953F40531916047F3BE52FA32D22E7EB4395EE6F2A46CD61B91
Reporter cocaman
Tags:exe INVOICE RevCodeRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
119
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
JANUARY OVERDUE INVOICE.pdf.exe
Verdict:
Malicious activity
Analysis date:
2021-04-07 05:16:32 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/b5767716-41ab-4afa-aa81-7a304802635e

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/132729/
Detection(s):
SecuriteInfo.com.MSIL.Kryptik.WZA.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Sending a UDP request
Result
Verdict:
MALICIOUS
Details
Windows PE Executable
Found a Windows Portable Executable (PE) binary. Depending on context, the presence of a binary is suspicious or malicious.
Result
Threat name:
WebMonitor RAT
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/668200
Signature
Allocates memory in foreign processes
Contain functionality to detect virtual machines
Contains functionality to check if a debugger is running (CheckRemoteDebuggerPresent)
Contains functionality to register a low level keyboard hook
Creates autostart registry keys with suspicious names
Initial sample is a PE file and has a suspicious name
Injects a PE file into a foreign processes
Installs a global keyboard hook
Machine Learning detection for dropped file
Machine Learning detection for sample
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Potentially malicious time measurement code found
Queries sensitive BIOS Information (via WMI, Win32_Bios & Win32_BaseBoard, often done to detect virtual machines)
Queries sensitive video device information (via WMI, Win32_VideoController, often done to detect virtual machines)
Sigma detected: Scheduled temp file as task from temp location
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to detect virtualization through RDTSC time measurements
Uses an obfuscated file name to hide its real file extension (double extension)
Uses schtasks.exe or at.exe to add and modify task schedules
Writes to foreign memory regions
Yara detected AntiVM3
Yara detected WebMonitor RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 383031 Sample: JANUARY OVERDUE INVOICE.pdf.exe Startdate: 07/04/2021 Architecture: WINDOWS Score: 100 35 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->35 37 Multi AV Scanner detection for dropped file 2->37 39 Sigma detected: Scheduled temp file as task from temp location 2->39 41 9 other signatures 2->41 7 JANUARY OVERDUE INVOICE.pdf.exe 7 2->7         started        process3 file4 21 C:\Users\user\AppData\...\LbDmDauhDnWnVS.exe, PE32 7->21 dropped 23 C:\...\LbDmDauhDnWnVS.exe:Zone.Identifier, ASCII 7->23 dropped 25 C:\Users\user\AppData\Local\...\tmp2D80.tmp, XML 7->25 dropped 27 C:\...\JANUARY OVERDUE INVOICE.pdf.exe.log, ASCII 7->27 dropped 43 Writes to foreign memory regions 7->43 45 Allocates memory in foreign processes 7->45 47 Injects a PE file into a foreign processes 7->47 11 RegSvcs.exe 7->11         started        14 RegSvcs.exe 2 13 7->14         started        17 schtasks.exe 1 7->17         started        signatures5 process6 dnsIp7 49 Queries sensitive video device information (via WMI, Win32_VideoController, often done to detect virtual machines) 11->49 51 Queries sensitive BIOS Information (via WMI, Win32_Bios & Win32_BaseBoard, often done to detect virtual machines) 11->51 53 Contain functionality to detect virtual machines 11->53 59 4 other signatures 11->59 29 ntp.se 194.58.200.20, 123, 53024, 55985 NTP-SEAnycastedNTPservicesfromNetnodIXPsSE Sweden 14->29 31 niiarmah.wm01.to 45.153.186.90, 443, 49716, 49721 MVPShttpswwwmvpsnetEU Bulgaria 14->31 33 2 other IPs or domains 14->33 55 Creates autostart registry keys with suspicious names 14->55 57 Installs a global keyboard hook 14->57 19 conhost.exe 17->19         started        signatures8 process9
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b4fbe906439597a3d05b94f3a7001069687e598cabc9a82e47d6c43046be10a5/
Threat name:
Win32.Trojan.Wacatac
Create hunting rule
Status:
Malicious
First seen:
2021-04-06 03:05:55 UTC
File Type:
PE (.Net Exe)
Extracted files:
35
AV detection:
24 of 48 (50.00%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=wt56sbsdswl2huc3stz2oaaqnfuh4wmmvpe2qlsh23cdarv6ccsq._file
Verdict:
malicious
Similar samples:
1167a7d5a6192107c841eee3d1292914e2ddbe6b661f2c2c41f1c1977ac97372
RevCodeRAT
25321bc3e274b62ff03c184cd1a058645d41f842ce0b368019912ada6b3f34df
RevCodeRAT
3c8d5a42b3b1e9ec4c489d8ec98ba60d6d107e62b2d1a2cc43570840374ff05f
RevCodeRAT
44e0cbb71f45ffa77eecd718ba1bba3362da2b7d1ef260474a39d143acd65260
RevCodeRAT
4a2d48d163b550561583e4e5811dc43cb67045e7a9816c30fb8fde4af8dd06d5
RevCodeRAT
4dec812952bd5e2e6ee08fec35c3d78887feaf0269cf4f624b965b5f8c481652
RevCodeRAT
78be18a8bdab5baf14aa5c195ce9f5636750cd4fee2d3bbc3528f4ed8f9ad9ee
RevCodeRAT
b426493d22cf9ad03bb8958bb2d994119dd6fb014c23855775dd7a9660bb51a9
RevCodeRAT
ea49f722d6874e9b0b754f8116edceee6cdf4b85aa893d1b86053bfc506e5602
RevCodeRAT
fe2f20398cff7bea0e10e10940e0936e2525ba8dba51263387f1b1d82d8b1aea
RevCodeRAT
+ 38 additional samples on MalwareBazaar
Result
Malware family:
n/a
Score:
  5/10
Tags:
n/a
Link:
https://tria.ge/reports/210407-h2tt7jq6j2/
Behaviour
Creates scheduled task(s)
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Suspicious use of SetThreadContext
Unpacked files
SH256 hash:
6590b9ec4fa84e44c372fda26f47d6d58859d74869621c6bdd4086e6ae411379
MD5 hash:
95dfa1a9015a17a1d49b4faa3f3d999d
SHA1 hash:
427b72727b28436554d0443d797f19b2ea37cc16
Link:
https://www.unpac.me/results/4c3cb784-6311-4fc2-af4c-b683acc38fab/
SH256 hash:
b4fbe906439597a3d05b94f3a7001069687e598cabc9a82e47d6c43046be10a5
MD5 hash:
f7d79ec6a3bf524f8f0c0e8d54949948
SHA1 hash:
ff9535613f977f6321a1eca20c50e97d23c83259
Link:
https://www.unpac.me/results/4c3cb784-6311-4fc2-af4c-b683acc38fab/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/b4fbe906439597a3d05b94f3a7001069687e598cabc9a82e47d6c43046be10a5

YARA Signatures

MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.

Rule name:Keylog_bin_mem
Create hunting rule
Author:James_inthe_box
Description:Contains Keylog
Rule name:MALWARE_Win_RevCodeRAT
Create hunting rule
Author:ditekSHen
Description:Detects RevCode/WebMonitor RAT
Rule name:Select_from_enumeration
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:win_webmonitor_w0
Create hunting rule
Author:James_inthe_box
Description:Revcode RAT
Reference:ee1b9659f2193896ce3469b5f90b82af3caffcba428e8524be5a9fdf391d8dd8

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Malspam

RevCodeRAT

arj 01a0edfce737d16102372ac1228f4095a3bdab926ecbccf64b452a4e9972a59a

RevCodeRAT

Executable exe b4fbe906439597a3d05b94f3a7001069687e598cabc9a82e47d6c43046be10a5

(this sample)

  
Delivery method
Other
  
Dropped by
SHA256 01a0edfce737d16102372ac1228f4095a3bdab926ecbccf64b452a4e9972a59a
Cape
Cape
https://www.capesandbox.com/analysis/132729/

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