stealc | 7261d4b797dbbf5cb8c015beb343ef7f95f1183553d34d11b5a620ee34c80ddc

Analysis

max time kernel
141s
max time network
124s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
10-10-2024 12:55

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General

Target

r6_external.exe
Size

3.7MB
MD5

6b81f9f9d69045ba2ebb229dfcd42554
SHA1

d3ec868616014de922e1e8fa77f0fd9e19e72f3c
SHA256

7261d4b797dbbf5cb8c015beb343ef7f95f1183553d34d11b5a620ee34c80ddc
SHA512

c618541f8534d60522c1ead509e2682d511bf749a4221db4b4383da294d8fa807f334c30f4a8b66171a2345381067e5cdb3b79eb72823bb78842b611aa96cc63
SSDEEP

98304:TXJFZkiG8LhDN7S8bPDUUNiAcN+KK09tpC/Ms:TZFSEB7S8bbUUEK0k/

Score

10^/10

stealc game discovery evasion persistence stealer themida trojan

Malware Config

Extracted

Family

stealc

Botnet

game

http://193.233.112.44

Attributes

url_path
/383ccd496f3c5eee.php

Signatures

Stealc
Stealc is an infostealer written in C++.
stealer 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__	VC_redistx64.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	VC_redistx64.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	VC_redistx64.exe

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-1-5-21-1846800975-3917212583-2893086201-1000\Control Panel\International\Geo\Nation	VC_redistx64.exe

Executes dropped EXE 3 IoCs

pid	Process
2656	gWsmPty.exe
2712	VC_redistx64.exe
2840	r6_external.exe

Loads dropped DLL 4 IoCs

pid	Process
2268	r6_external.exe
1996	WerFault.exe
1996	WerFault.exe
1996	WerFault.exe

Themida packer 5 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral1/files/0x002e00000001936b-19.dat	themida
behavioral1/memory/2712-21-0x0000000000400000-0x0000000000B78000-memory.dmp	themida
behavioral1/memory/2712-27-0x0000000000400000-0x0000000000B78000-memory.dmp	themida
behavioral1/memory/2712-26-0x0000000000400000-0x0000000000B78000-memory.dmp	themida
behavioral1/memory/2712-30-0x0000000000400000-0x0000000000B78000-memory.dmp	themida

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1846800975-3917212583-2893086201-1000\Software\Microsoft\Windows\CurrentVersion\Run\My Program = "C:\\Users\\Admin\\AppData\\Roaming\\MyHiddenFolder\\VC_redistx64.exe"	VC_redistx64.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

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	VC_redistx64.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
2712	VC_redistx64.exe

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1996	2656	WerFault.exe	31

System Location Discovery: System Language Discovery 1 TTPs 2 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	VC_redistx64.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	gWsmPty.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	gWsmPty.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	gWsmPty.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2712	VC_redistx64.exe
2656	gWsmPty.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2268 wrote to memory of 2656	2268	r6_external.exe	31
PID 2268 wrote to memory of 2656	2268	r6_external.exe	31
PID 2268 wrote to memory of 2656	2268	r6_external.exe	31
PID 2268 wrote to memory of 2656	2268	r6_external.exe	31
PID 2268 wrote to memory of 2712	2268	r6_external.exe	32
PID 2268 wrote to memory of 2712	2268	r6_external.exe	32
PID 2268 wrote to memory of 2712	2268	r6_external.exe	32
PID 2268 wrote to memory of 2712	2268	r6_external.exe	32
PID 2268 wrote to memory of 2840	2268	r6_external.exe	33
PID 2268 wrote to memory of 2840	2268	r6_external.exe	33
PID 2268 wrote to memory of 2840	2268	r6_external.exe	33
PID 2656 wrote to memory of 1996	2656	gWsmPty.exe	36
PID 2656 wrote to memory of 1996	2656	gWsmPty.exe	36
PID 2656 wrote to memory of 1996	2656	gWsmPty.exe	36
PID 2656 wrote to memory of 1996	2656	gWsmPty.exe	36

C:\Users\Admin\AppData\Local\Temp\r6_external.exe
"C:\Users\Admin\AppData\Local\Temp\r6_external.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2268
- C:\Users\Admin\AppData\Roaming\gWsmPty.exe
  "C:\Users\Admin\AppData\Roaming\gWsmPty.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2656
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2656 -s 892
    3⤵
    - Loads dropped DLL
    - Program crash
    PID:1996
- C:\Users\Admin\AppData\Roaming\VC_redistx64.exe
  "C:\Users\Admin\AppData\Roaming\VC_redistx64.exe"
  2⤵
  - Identifies VirtualBox via ACPI registry values (likely anti-VM)
  - Checks BIOS information in registry
  - Checks computer location settings
  - Executes dropped EXE
  - Adds Run key to start application
  - Checks whether UAC is enabled
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  PID:2712
- C:\Users\Admin\AppData\Roaming\r6_external.exe
  "C:\Users\Admin\AppData\Roaming\r6_external.exe"
  2⤵
  - Executes dropped EXE
  PID:2840

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\VC_redistx64.exe

Filesize
2.9MB

MD5
507acc8f3249adef7468989fee931211

SHA1
4d66286973a21e76b0e2c746bac00fa28d446ca9

SHA256
6abb77dce6d4af42005e673cb089b6d41e0ef0b88a6411f4d5dfd8e8b4858154

SHA512
2faee963523b401bf1e588c86bfeef899067456f22848d299525acde5d2ce28a66f769d741deea2e6b218b4e1b0c0f7f4cc08cfc1c2fd8eac5375b3c183b7ee3

Download Submit
C:\Users\Admin\AppData\Roaming\gWsmPty.exe

Filesize
322KB

MD5
c57f035e099bfe7f8d56917a22266dc9

SHA1
88a4ab3cef2b3d293b6d94b8d5b38298d1ec6d87

SHA256
d075bbba29912ff7a321ee5dcb32159b9de8e27e716a1aad9ed52bb9d9ccc4a3

SHA512
836f345be084eeaef97144faa845a697f3c40a5f643088ee355d71cbedac23506c4d53267220bfa467872e850faebbc5a3919fbeb5628534619d39fbcbf1e1e4

Download Submit
\Users\Admin\AppData\Roaming\r6_external.exe

Filesize
37KB

MD5
96276e48409016997548282874763107

SHA1
1abfb128b7d0801c7277755635eb5d533495836d

SHA256
9237707a4d9193738e78acb7ff264360fa46e54cfde6e383efb20fffc6488a5a

SHA512
fa5c857fdfb6cabdce2895d29400e0faff808efd51da4f6822d4c40fb3988fbcbb6803ee8ac47eb02d765ff92c2858d885c49e1c812d267d173697191d2da112

Download Submit
memory/2268-4-0x000000001B5F0000-0x000000001B97E000-memory.dmp

Filesize
3.6MB

Download
memory/2268-1-0x0000000000D20000-0x00000000010CE000-memory.dmp

Filesize
3.7MB

Download
memory/2268-5-0x00000000003E0000-0x00000000003E6000-memory.dmp

Filesize
24KB

Download
memory/2268-3-0x000007FEF5EB0000-0x000007FEF689C000-memory.dmp

Filesize
9.9MB

Download
memory/2268-0-0x000007FEF5EB3000-0x000007FEF5EB4000-memory.dmp

Filesize
4KB

Download
memory/2268-2-0x00000000003D0000-0x00000000003D6000-memory.dmp

Filesize
24KB

Download
memory/2268-28-0x000007FEF5EB0000-0x000007FEF689C000-memory.dmp

Filesize
9.9MB

Download
memory/2656-15-0x00000000000E0000-0x0000000000343000-memory.dmp

Filesize
2.4MB

Download
memory/2656-38-0x00000000000E0000-0x0000000000343000-memory.dmp

Filesize
2.4MB

Download
memory/2712-21-0x0000000000400000-0x0000000000B78000-memory.dmp

Filesize
7.5MB

Download
memory/2712-27-0x0000000000400000-0x0000000000B78000-memory.dmp

Filesize
7.5MB

Download
memory/2712-26-0x0000000000400000-0x0000000000B78000-memory.dmp

Filesize
7.5MB

Download
memory/2712-24-0x0000000077780000-0x0000000077782000-memory.dmp

Filesize
8KB

Download
memory/2712-30-0x0000000000400000-0x0000000000B78000-memory.dmp

Filesize
7.5MB

Download