isrstealer | 4f619c7b4f54dd6ed7833880c8600334c42084a20c73d9b76973d45202a734c7

General

Target

Halkbank,doc.exe
Size

392KB
MD5

04ce3268080cb301ad8202217685ca59
SHA1

b5466d71f17fb9f454cee13a83faf7c1e2d0022d
SHA256

4f619c7b4f54dd6ed7833880c8600334c42084a20c73d9b76973d45202a734c7
SHA512

3feecf60ae8f5aa9dbba576cf61b9db8f7359ce6056ecd8c463898f4cb301242280101c5f56143b79ae07c043270612299f43246d144700d0aba0fa2970bf715
SSDEEP

12288:+/nedKoh5Y6yMYmWjBJlpeSzoD7O1CR3m:2gdh5NKtJD8PrR3m

Score

10^/10

isrstealer collection spyware stealer trojan upx

Malware Config

Signatures

ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
trojan stealer isrstealer

ISR Stealer payload 4 IoCs

resource	yara_rule
behavioral2/memory/3236-3-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3236-7-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3236-12-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3236-26-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/1728-24-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/1728-23-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/1728-24-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/1728-23-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

UPX packed file 10 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2728-10-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2728-13-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2728-15-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1728-16-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1728-18-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2728-19-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2728-21-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1728-22-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1728-24-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1728-23-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2344688013-2965468717-2034126-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	regasm.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 552 set thread context of 3236	552	Halkbank,doc.exe	86
PID 3236 set thread context of 2728	3236	regasm.exe	88
PID 3236 set thread context of 1728	3236	regasm.exe	90

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
552	Halkbank,doc.exe
552	Halkbank,doc.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	552	Halkbank,doc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3236	regasm.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 552 wrote to memory of 3236	552	Halkbank,doc.exe	86
PID 552 wrote to memory of 3236	552	Halkbank,doc.exe	86
PID 552 wrote to memory of 3236	552	Halkbank,doc.exe	86
PID 552 wrote to memory of 3236	552	Halkbank,doc.exe	86
PID 552 wrote to memory of 3236	552	Halkbank,doc.exe	86
PID 552 wrote to memory of 3236	552	Halkbank,doc.exe	86
PID 552 wrote to memory of 3236	552	Halkbank,doc.exe	86
PID 552 wrote to memory of 3236	552	Halkbank,doc.exe	86
PID 3236 wrote to memory of 2728	3236	regasm.exe	88
PID 3236 wrote to memory of 2728	3236	regasm.exe	88
PID 3236 wrote to memory of 2728	3236	regasm.exe	88
PID 3236 wrote to memory of 2728	3236	regasm.exe	88
PID 3236 wrote to memory of 2728	3236	regasm.exe	88
PID 3236 wrote to memory of 2728	3236	regasm.exe	88
PID 3236 wrote to memory of 2728	3236	regasm.exe	88
PID 3236 wrote to memory of 2728	3236	regasm.exe	88
PID 3236 wrote to memory of 1728	3236	regasm.exe	90
PID 3236 wrote to memory of 1728	3236	regasm.exe	90
PID 3236 wrote to memory of 1728	3236	regasm.exe	90
PID 3236 wrote to memory of 1728	3236	regasm.exe	90
PID 3236 wrote to memory of 1728	3236	regasm.exe	90
PID 3236 wrote to memory of 1728	3236	regasm.exe	90
PID 3236 wrote to memory of 1728	3236	regasm.exe	90
PID 3236 wrote to memory of 1728	3236	regasm.exe	90

C:\Users\Admin\AppData\Local\Temp\Halkbank,doc.exe
"C:\Users\Admin\AppData\Local\Temp\Halkbank,doc.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:552
- C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
  "C:\Users\Admin\AppData\Local\Temp\Halkbank,doc.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3236
- - C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\hgI9HhB0Nd.ini"
    3⤵
    PID:2728
- - C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\tmeIlfcgxE.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:1728

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/552-1-0x0000000074AE0000-0x0000000075091000-memory.dmp

Filesize
5.7MB

Download
memory/552-2-0x0000000001360000-0x0000000001370000-memory.dmp

Filesize
64KB

Download
memory/552-6-0x0000000074AE0000-0x0000000075091000-memory.dmp

Filesize
5.7MB

Download
memory/552-0-0x0000000074AE0000-0x0000000075091000-memory.dmp

Filesize
5.7MB

Download
memory/1728-16-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1728-23-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1728-24-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1728-22-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1728-18-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2728-13-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2728-15-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2728-19-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2728-21-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2728-10-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3236-12-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3236-7-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3236-3-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3236-26-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download

Analysis

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