b70b9039ec4b33987a991c5c20729eb3310d7406b8d15161037df3b21fd968bb

Target
APP.exe
Size 5.2MB
Sample210927-tp7c4shebk
SHA256 72cb50e5791e1fcb11d24bc4cff3b44379a529c5549fbf6f500adcd67bfe9139
MD5 a0b4d2c96937104bcffd21ce69885a59
SHA1 6cda6e2bee6d67a5f407e4d7e96af9d76bfa7c79
SHA512 17b1b4de1bddb7f357744ace07509481e80eb8a63fa9c39ee00ecd7eba3b03611eb0e2329e88e20b05e8a2655fa67a7b699c8455c1fa9aebeba4384151ae2ee0
MD5 SHA1 SHA512

Score

10^/10

evasion ransomware themida trojan

Malware Config

Extracted

Path

C:\Users\Admin\HOW_TO_RECOVER_FILES.Colossus.txt

Ransom Note

[+] What's Happened? [+] Your files have been encrypted and currently unavailable. You can check it. All files in your system have "Colossus" extension. By the way, everything is possible to recover (restore) but you should follow our instructions. Otherwise you can NEVER return your data. [+] What are our guarantees? [+] It's just a business and we care only about getting benefits. If we don't meet our obligations, nobody will deal with us. It doesn't hold our interest. So you can check the ability to restore your files. For this purpose you should come to talk to us we can decrypt one of your files for free. That is our guarantee. It doesn't metter for us whether you cooperate with us or not. But if you don't, you'll lose your time and data cause only we have the private key to decrypt your files. time is much more valuable than money. [+] Data Leak [+] We uploaded your data and if you dont contact with us then we will publish your data. Example of data: - Accounting data - Executive data - Sales data - Customer support data - Marketing data - And more other ... [+] How to Contact? [+] You have two options : 1. Chat with me : -Visit our website: http://colossus.support/LPc6EwBqmyC8Tv9Glawleycars/ -When you visit our website, put the following KEY into the input form. -Then start talk to me. 2. Email me at : [email protected] KEY: MjdhZDUzM2Y3MTVhZmUxZjI2NTk2ZGM4YjVhN2EwMDEzODk2M2ZhNWEzMGU2Mjc5MTU4ODFjYjhiNWE3YTAwMTM4OTYzZmE1YTMwZTYyNzkxNTg4MWNiZmRkNDkwNDhiNzA0MjVhNGU0YTc0N2FhYzY0MWU5MTFjODY3M2RhZGQ= !!! DANGER !!! DON'T try to change files by yourself, DON'T use any third party software or antivirus solutions to restore your data - it may entail the private key damage and as a result all your data loss! !!! !!! !!! ONE MORE TIME: It's in your best interests to get your files back. From our side we ready to make everything for restoring but please do not interfere. !!! !!! !!

Emails

[email protected]

URLs

http://colossus.support/LPc6EwBqmyC8Tv9Glawleycars/

Signatures

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Checks BIOS information in registry 2 TTPs 4 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	APP.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	APP.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	APP.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	APP.exe

Themida packer 2 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral1/memory/4060-114-0x0000000000B90000-0x000000000186B000-memory.dmp	themida
behavioral1/memory/632-117-0x0000000000B90000-0x000000000186B000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	APP.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	APP.exe

Colossus Note 2 IoCs

Detect Colossus ransomware note.

colossus ransomware ransom note

resource	yara_rule
	Colossus_Note
behavioral1/files/0x000600000001ab2c-119.dat	Colossus_Note

Opens file in notepad (likely ransom note) 1 IoCs

ransomware

pid	Process
3552	NOTEPAD.EXE

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 3168 wrote to memory of 632	3168	cmd.exe	81
PID 3168 wrote to memory of 632	3168	cmd.exe	81

C:\Users\Admin\AppData\Local\Temp\APP.exe
"C:\Users\Admin\AppData\Local\Temp\APP.exe"
1⤵
- Checks BIOS information in registry
- Checks whether UAC is enabled
PID:4060

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:1840

C:\Windows\System32\cmd.exe
"C:\Windows\System32\cmd.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3168
- C:\Users\Admin\AppData\Local\Temp\APP.exe
  .\APP.exe 6e42f05c8e4d24c3fa0ce2f2a8d203c8 C:\Users\Admin
  2⤵
  - Checks BIOS information in registry
  - Checks whether UAC is enabled
  PID:632

C:\Windows\system32\NOTEPAD.EXE
"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\HOW_TO_RECOVER_FILES.Colossus.txt
1⤵
- Opens file in notepad (likely ransom note)
PID:3552

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/632-117-0x0000000000B90000-0x000000000186B000-memory.dmp

Download

memory/4060-114-0x0000000000B90000-0x000000000186B000-memory.dmp

Download

memory/4060-115-0x0000000000B91000-0x0000000000C77000-memory.dmp

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads