blustealer | fd10d0c124ace345aaace7bab115d0cd3771c61919912e141924991146fc6b37

General

Target

Halkbank_Ekstre_20221228_114528_468568,PDF.exe
Size

353KB
MD5

c66534531458e789ad2fcdb17a3a0489
SHA1

28064aa47534ed6af85b6972cca639c3dcde93ee
SHA256

fd10d0c124ace345aaace7bab115d0cd3771c61919912e141924991146fc6b37
SHA512

1ca186310c3f85a46a3b9782c301af137be5100f988f7adc7ba266feabb45da239d8b433c6079a1d0459bbd06647aee2812c6f67394c893eb5566090c8d1613d
SSDEEP

6144:CYa6H/tWpNp5Cdqzr+yohjVpP515uGUhZzN4:CY9/tANp5/zApnPb5uGUhT4

Score

10^/10

blustealer stormkitty collection persistence stealer

Malware Config

Extracted

Family

blustealer

C2

https://api.telegram.org/bot5468731092:AAGGNQWBVRhX622u6xp1moMhaunIGtXuIxg/sendMessage?chat_id=1639214896

Signatures

BluStealer
A Modular information stealer written in Visual Basic.
stealer blustealer
StormKitty
StormKitty is an open source info stealer written in C#.
stealer stormkitty

StormKitty payload 1 IoCs

resource	yara_rule
behavioral2/memory/4832-142-0x0000000000DE0000-0x0000000000DFA000-memory.dmp	family_stormkitty

Executes dropped EXE 2 IoCs

pid	Process
3272	ikrkynwh.exe
4616	ikrkynwh.exe

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe
Key opened	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe
Key opened	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gcarrdr = "C:\\Users\\Admin\\AppData\\Roaming\\vtnihy\\qkubbjloxlw.exe \"C:\\Users\\Admin\\AppData\\Local\\Temp\\ikrkynwh.exe\" C:\\Users\\Admin\\AppData\\Loca"	ikrkynwh.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
12	icanhazip.com

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3272 set thread context of 4616	3272	ikrkynwh.exe	81
PID 4616 set thread context of 4832	4616	ikrkynwh.exe	82

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

System Information Discovery
T1082

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 opened	\REGISTRY\MACHINE\HARDWARE\Description\System\CentralProcessor\0	AppLaunch.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	AppLaunch.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3272	ikrkynwh.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4832	AppLaunch.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4616	ikrkynwh.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 4212 wrote to memory of 3272	4212	Halkbank_Ekstre_20221228_114528_468568,PDF.exe	79
PID 4212 wrote to memory of 3272	4212	Halkbank_Ekstre_20221228_114528_468568,PDF.exe	79
PID 4212 wrote to memory of 3272	4212	Halkbank_Ekstre_20221228_114528_468568,PDF.exe	79
PID 3272 wrote to memory of 4616	3272	ikrkynwh.exe	81
PID 3272 wrote to memory of 4616	3272	ikrkynwh.exe	81
PID 3272 wrote to memory of 4616	3272	ikrkynwh.exe	81
PID 3272 wrote to memory of 4616	3272	ikrkynwh.exe	81
PID 4616 wrote to memory of 4832	4616	ikrkynwh.exe	82
PID 4616 wrote to memory of 4832	4616	ikrkynwh.exe	82
PID 4616 wrote to memory of 4832	4616	ikrkynwh.exe	82
PID 4616 wrote to memory of 4832	4616	ikrkynwh.exe	82
PID 4616 wrote to memory of 4832	4616	ikrkynwh.exe	82

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	AppLaunch.exe

C:\Users\Admin\AppData\Local\Temp\Halkbank_Ekstre_20221228_114528_468568,PDF.exe
"C:\Users\Admin\AppData\Local\Temp\Halkbank_Ekstre_20221228_114528_468568,PDF.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4212
- C:\Users\Admin\AppData\Local\Temp\ikrkynwh.exe
  "C:\Users\Admin\AppData\Local\Temp\ikrkynwh.exe" C:\Users\Admin\AppData\Local\Temp\xmldsat.h
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of SetThreadContext
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:3272
- - C:\Users\Admin\AppData\Local\Temp\ikrkynwh.exe
    "C:\Users\Admin\AppData\Local\Temp\ikrkynwh.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4616
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
      C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
      4⤵
      Accesses Microsoft Outlook profiles
      Checks processor information in registry
      Suspicious use of AdjustPrivilegeToken
      outlook_office_path
      outlook_win_path
      PID:4832

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\bszkpd.f

Filesize
156KB

MD5
ac435352e073d8c7bd260568beb2f717

SHA1
fbac93ceb7f634d59665e2f0eed8ec453ee217f9

SHA256
2a25c2f8a5c6acd12d7a0547b0ad320f5781a1d9ab30865a2d94ec4041ddb972

SHA512
a896cd1f34ed6496b91886f8f7e44b01be711fe7f0a8ce4059b674791a32c05328ebaa76480f8f7992708324043972ff2e64dcc787c6e507db7615c2002aa8cb

Download Submit
C:\Users\Admin\AppData\Local\Temp\ikrkynwh.exe

Filesize
52KB

MD5
1220d5eed57095d973c28b8e112734d7

SHA1
9f0c7d753ba1cbc7979fbaf25b1c1a89b1a4338e

SHA256
05be036c209434ff740e07f8c2eb2d2f18533220c373a60d39646b688b531e21

SHA512
c2c15643d25ced62a06ee61869f0b319769c34222b8eeee466f93df92addd719fa0fdbefb044d519bfa304d22b540680ef37b7283b7c61760c6073a148ba0938

Download Submit
C:\Users\Admin\AppData\Local\Temp\ikrkynwh.exe

Filesize
52KB

MD5
1220d5eed57095d973c28b8e112734d7

SHA1
9f0c7d753ba1cbc7979fbaf25b1c1a89b1a4338e

SHA256
05be036c209434ff740e07f8c2eb2d2f18533220c373a60d39646b688b531e21

SHA512
c2c15643d25ced62a06ee61869f0b319769c34222b8eeee466f93df92addd719fa0fdbefb044d519bfa304d22b540680ef37b7283b7c61760c6073a148ba0938

Download Submit
C:\Users\Admin\AppData\Local\Temp\ikrkynwh.exe

Filesize
52KB

MD5
1220d5eed57095d973c28b8e112734d7

SHA1
9f0c7d753ba1cbc7979fbaf25b1c1a89b1a4338e

SHA256
05be036c209434ff740e07f8c2eb2d2f18533220c373a60d39646b688b531e21

SHA512
c2c15643d25ced62a06ee61869f0b319769c34222b8eeee466f93df92addd719fa0fdbefb044d519bfa304d22b540680ef37b7283b7c61760c6073a148ba0938

Download Submit
C:\Users\Admin\AppData\Local\Temp\xmldsat.h

Filesize
7KB

MD5
5591482cf150f75d4bd2e3ebc40a81ea

SHA1
78e0ed5cc9d75cd277afcd00cca69db31f1855e0

SHA256
c9f4b498e415ebacd06960577c38c21193c15a7a65d73f87ab5f162d529ecb2a

SHA512
f942eb33188a94bf4116358e0208c690f15248d73da8083c9f2f037e8f74f8e39e6ed1d023cd6f952d809877cc9ae28fafd51dde8db4e632168e98bf8325a08a

Download Submit
memory/4616-143-0x0000000000400000-0x0000000000422000-memory.dmp

Filesize
136KB

Download
memory/4616-146-0x0000000000400000-0x0000000000422000-memory.dmp

Filesize
136KB

Download
memory/4832-142-0x0000000000DE0000-0x0000000000DFA000-memory.dmp

Filesize
104KB

Download
memory/4832-144-0x00000000056B0000-0x0000000005716000-memory.dmp

Filesize
408KB

Download
memory/4832-145-0x0000000006130000-0x00000000061CC000-memory.dmp

Filesize
624KB

Download

Analysis

Sharing