022728f678d8dcc6cba20147595ed4099e9c98be0582c0f67518d5664e3b8523

Analysis

max time kernel
143s
max time network
173s
platform
windows10-2004_x64
resource
win10v2004-20240226-uk
resource tags

arch:x64arch:x86image:win10v2004-20240226-uklocale:uk-uaos:windows10-2004-x64systemwindows
submitted
03-03-2024 13:53

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General

Target

Ransomware/Birele.exe
Size

116KB
MD5

41789c704a0eecfdd0048b4b4193e752
SHA1

fb1e8385691fa3293b7cbfb9b2656cf09f20e722
SHA256

b2dcfdf9e7b09f2aa5004668370e77982963ace820e7285b2e264a294441da23
SHA512

76391ac85fdc3be75441fcd6e19bed08b807d3946c7281c647f16a3be5388f7be307e6323fac8502430a4a6d800d52a88709592a49011ecc89de4f19102435ea
SSDEEP

3072:pYV/aVHN9ySTn34w33FVTyuGAxsvBLSqAKZqoqrxy031l3y:8adNlltyu3Pa5gr33

Score

10^/10

persistence upx

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

Processes:

Birele.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3045580317-3728985860-206385570-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Ransomware\\Birele.exe"	Birele.exe

UPX packed file 5 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

Processes:

resource	yara_rule
behavioral5/memory/3080-0-0x0000000000400000-0x0000000000438000-memory.dmp	upx
behavioral5/memory/3080-2-0x0000000000400000-0x0000000000438000-memory.dmp	upx
behavioral5/memory/3080-4-0x0000000000400000-0x0000000000438000-memory.dmp	upx
behavioral5/memory/3080-5-0x0000000000400000-0x0000000000438000-memory.dmp	upx
behavioral5/memory/3080-6-0x0000000000400000-0x0000000000438000-memory.dmp	upx

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

Birele.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3045580317-3728985860-206385570-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\system = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Ransomware\\Birele.exe"	Birele.exe

Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

1616 taskkill.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

taskkill.exe

description pid process

Token: SeDebugPrivilege 1616 taskkill.exe

pid	process
1616	taskkill.exe

description	pid	process
Token: SeDebugPrivilege	1616	taskkill.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

Birele.exe

description	pid	process	target process
PID 3080 wrote to memory of 1616	3080	Birele.exe	taskkill.exe
PID 3080 wrote to memory of 1616	3080	Birele.exe	taskkill.exe
PID 3080 wrote to memory of 1616	3080	Birele.exe	taskkill.exe

C:\Users\Admin\AppData\Local\Temp\Ransomware\Birele.exe
"C:\Users\Admin\AppData\Local\Temp\Ransomware\Birele.exe"
1⤵
- Modifies WinLogon for persistence
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:3080

C:\Windows\SysWOW64\taskkill.exe
taskkill /F /IM explorer.exe
2⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1616

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

memory/3080-0-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/3080-1-0x00000000006E0000-0x00000000006E6000-memory.dmp

Filesize
24KB

Download
memory/3080-2-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/3080-4-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/3080-5-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/3080-6-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download