stealc | f2a959caed0d99d3ff313f6c7f70a8752d8bc2dbfda56ea577596ffadd980e67

General

Target

EPRG4_random.exe
Size

1.7MB
MD5

cfed3795b5df45bbd48f493175331240
SHA1

53dc65f12e0d3db668365282f6add85bc42619a5
SHA256

f2a959caed0d99d3ff313f6c7f70a8752d8bc2dbfda56ea577596ffadd980e67
SHA512

d9d3c6760a7f143b2651cccc8fe2b7a79d010a17df508becdc5353c75b0e3f6afd96ce00644817e9a6ad5c419bdad01cb5dd442958e0fb8113fc364dc4201a75
SSDEEP

49152:fwA35/F+M/hzNeSpX94/08cM3Gky7VF1/dgzRJ3U:f55/NpNZMcg3G/7Xk3

Score

10^/10

stealc brat discovery evasion stealer

Malware Config

Extracted

Family

stealc

Botnet

brat

C2

http://185.215.113.206

Attributes

url_path
/c4becf79229cb002.php

Signatures

Stealc
Stealc is an infostealer written in C++.
stealer stealc
Stealc family
stealc

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	EPRG4_random.exe

Checks BIOS information in registry 2 TTPs 2 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	EPRG4_random.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	EPRG4_random.exe

Identifies Wine through registry keys 2 TTPs 1 IoCs

Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4177215427-74451935-3209572229-1000\Software\Wine	EPRG4_random.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
976	EPRG4_random.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2592	976	WerFault.exe	30

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	EPRG4_random.exe

Checks processor information in registry 2 TTPs 2 IoCs

Processor 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\CentralProcessor\0\ProcessorNameString	EPRG4_random.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	EPRG4_random.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
976	EPRG4_random.exe
976	EPRG4_random.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 976 wrote to memory of 2592	976	EPRG4_random.exe	32
PID 976 wrote to memory of 2592	976	EPRG4_random.exe	32
PID 976 wrote to memory of 2592	976	EPRG4_random.exe	32
PID 976 wrote to memory of 2592	976	EPRG4_random.exe	32

C:\Users\Admin\AppData\Local\Temp\EPRG4_random.exe
"C:\Users\Admin\AppData\Local\Temp\EPRG4_random.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:976
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 976 -s 924
  2⤵
  - Program crash
  PID:2592

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

2

T1497

Credential Access

Discovery

Query Registry

5

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Virtualization/Sandbox Evasion

2

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/976-0-0x00000000010D0000-0x0000000001755000-memory.dmp

Filesize
6.5MB

Download
memory/976-1-0x0000000077E40000-0x0000000077E42000-memory.dmp

Filesize
8KB

Download
memory/976-2-0x00000000010D1000-0x00000000010E8000-memory.dmp

Filesize
92KB

Download
memory/976-3-0x00000000010D0000-0x0000000001755000-memory.dmp

Filesize
6.5MB

Download
memory/976-4-0x00000000010D0000-0x0000000001755000-memory.dmp

Filesize
6.5MB

Download
memory/976-5-0x00000000010D0000-0x0000000001755000-memory.dmp

Filesize
6.5MB

Download
memory/976-6-0x00000000010D0000-0x0000000001755000-memory.dmp

Filesize
6.5MB

Download
memory/976-7-0x00000000010D0000-0x0000000001755000-memory.dmp

Filesize
6.5MB

Download
memory/976-8-0x00000000010D0000-0x0000000001755000-memory.dmp

Filesize
6.5MB

Download
memory/976-9-0x00000000010D0000-0x0000000001755000-memory.dmp

Filesize
6.5MB

Download
memory/976-10-0x00000000010D0000-0x0000000001755000-memory.dmp

Filesize
6.5MB

Download
memory/976-11-0x00000000010D0000-0x0000000001755000-memory.dmp

Filesize
6.5MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads