08f80851cddad7d6cdd737f0e8c0ed9154530f695548eecb4c1d8fb3a3ba6f8c

General

Target

unpacme/Bllfgyszs.exe
Size

1.2MB
MD5

b4bb8d5ebcafb7cc2681e17e3596649a
SHA1

cd7c93d59b53b54e8a3e24e065c9cc93c7101b79
SHA256

87e33a27066d4638c3aede2ef053462b8c48395de0dd8fc4087299628ff8e0fa
SHA512

9b4edd0cd365ca3d88ba786b258cad7310f8abe5d46dc261edc593fdf4a5a74e05c58d3ff1b7d3b76d10ef9890252d877e6a84212de08ab08018dcf3f06064b3
SSDEEP

24576:DBgfiF9Ctf4HCV6eQ3cfDmDjbSZ+/HAjZdMcj6Isc/:Db0tf4e6aDmDfgJbMcD/

Score

10^/10

persistence

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe,\"C:\\Users\\Admin\\AppData\\Roaming\\Hpyjpn\\Ogtnuzcwp.exe\","	Bllfgyszs.exe

.NET Reactor proctector 1 IoCs

Detects an executable protected by an unregistered version of Eziriz's .NET Reactor.

resource	yara_rule
behavioral2/memory/4916-132-0x0000000000B70000-0x0000000000CB2000-memory.dmp	net_reactor

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	Bllfgyszs.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4916 set thread context of 2132	4916	Bllfgyszs.exe	86

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4372	powershell.exe
4372	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4916	Bllfgyszs.exe
Token: SeDebugPrivilege	4372	powershell.exe
Token: SeDebugPrivilege	2132	InstallUtil.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4916 wrote to memory of 4588	4916	Bllfgyszs.exe	81
PID 4916 wrote to memory of 4588	4916	Bllfgyszs.exe	81
PID 4916 wrote to memory of 4588	4916	Bllfgyszs.exe	81
PID 4588 wrote to memory of 4372	4588	cmd.exe	83
PID 4588 wrote to memory of 4372	4588	cmd.exe	83
PID 4588 wrote to memory of 4372	4588	cmd.exe	83
PID 4916 wrote to memory of 2132	4916	Bllfgyszs.exe	86
PID 4916 wrote to memory of 2132	4916	Bllfgyszs.exe	86
PID 4916 wrote to memory of 2132	4916	Bllfgyszs.exe	86
PID 4916 wrote to memory of 2132	4916	Bllfgyszs.exe	86
PID 4916 wrote to memory of 2132	4916	Bllfgyszs.exe	86
PID 4916 wrote to memory of 2132	4916	Bllfgyszs.exe	86
PID 4916 wrote to memory of 2132	4916	Bllfgyszs.exe	86
PID 4916 wrote to memory of 2132	4916	Bllfgyszs.exe	86

C:\Users\Admin\AppData\Local\Temp\unpacme\Bllfgyszs.exe
"C:\Users\Admin\AppData\Local\Temp\unpacme\Bllfgyszs.exe"
1⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4916
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c powershell -ENC cwBlAHQALQBtAHAAcAByAGUAZgBlAHIAZQBuAGMAZQAgAC0AZQB4AGMAbAB1AHMAaQBvAG4AcABhAHQAaAAgAEMAOgBcAA==
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4588
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    powershell -ENC cwBlAHQALQBtAHAAcAByAGUAZgBlAHIAZQBuAGMAZQAgAC0AZQB4AGMAbAB1AHMAaQBvAG4AcABhAHQAaAAgAEMAOgBcAA==
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4372
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
  C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2132

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Privilege Escalation

Defense Evasion

Modify Registry

Web Service

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2132-143-0x0000000000400000-0x00000000004A6000-memory.dmp

Filesize
664KB

Download
memory/4372-144-0x0000000005850000-0x00000000058B6000-memory.dmp

Filesize
408KB

Download
memory/4372-150-0x00000000071C0000-0x00000000071DA000-memory.dmp

Filesize
104KB

Download
memory/4372-145-0x0000000005EC0000-0x0000000005EDE000-memory.dmp

Filesize
120KB

Download
memory/4372-154-0x0000000007500000-0x000000000751A000-memory.dmp

Filesize
104KB

Download
memory/4372-139-0x0000000002580000-0x00000000025B6000-memory.dmp

Filesize
216KB

Download
memory/4372-140-0x0000000005170000-0x0000000005798000-memory.dmp

Filesize
6.2MB

Download
memory/4372-153-0x00000000073F0000-0x00000000073FE000-memory.dmp

Filesize
56KB

Download
memory/4372-146-0x0000000006490000-0x00000000064C2000-memory.dmp

Filesize
200KB

Download
memory/4372-142-0x0000000005100000-0x0000000005166000-memory.dmp

Filesize
408KB

Download
memory/4372-155-0x00000000074E0000-0x00000000074E8000-memory.dmp

Filesize
32KB

Download
memory/4372-152-0x0000000007440000-0x00000000074D6000-memory.dmp

Filesize
600KB

Download
memory/4372-151-0x0000000007230000-0x000000000723A000-memory.dmp

Filesize
40KB

Download
memory/4372-147-0x0000000071710000-0x000000007175C000-memory.dmp

Filesize
304KB

Download
memory/4372-148-0x0000000006470000-0x000000000648E000-memory.dmp

Filesize
120KB

Download
memory/4372-149-0x0000000007800000-0x0000000007E7A000-memory.dmp

Filesize
6.5MB

Download
memory/4916-135-0x00000000059F0000-0x0000000005A82000-memory.dmp

Filesize
584KB

Download
memory/4916-133-0x0000000005FA0000-0x0000000006544000-memory.dmp

Filesize
5.6MB

Download
memory/4916-136-0x00000000058C0000-0x00000000058E2000-memory.dmp

Filesize
136KB

Download
memory/4916-134-0x00000000057F0000-0x0000000005882000-memory.dmp

Filesize
584KB

Download
memory/4916-132-0x0000000000B70000-0x0000000000CB2000-memory.dmp

Filesize
1.3MB

Download

Analysis

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