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

Processes:

resource	yara_rule
behavioral2/memory/1748-3-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1748-7-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1748-26-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1748-27-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

Processes:

resource	yara_rule
behavioral2/memory/1916-25-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/1916-24-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1916-25-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/1916-24-0x0000000000400000-0x000000000041F000-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

Processes:

resource	yara_rule
behavioral2/memory/4120-10-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4120-12-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4120-14-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4120-15-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4120-16-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1916-19-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1916-21-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1916-23-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1916-25-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1916-24-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

Processes:

regasm.exe

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1574508946-349927670-1185736483-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	regasm.exe

Suspicious use of SetThreadContext 3 IoCs

Processes:

Halkbank,doc.exeregasm.exe

description	pid	Process	procid_target
PID 4356 set thread context of 1748	4356	Halkbank,doc.exe	88
PID 1748 set thread context of 4120	1748	regasm.exe	89
PID 1748 set thread context of 1916	1748	regasm.exe	95

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

Halkbank,doc.exe

pid	Process
4356	Halkbank,doc.exe
4356	Halkbank,doc.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

Halkbank,doc.exe

description	pid	Process
Token: SeDebugPrivilege	4356	Halkbank,doc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

regasm.exe

pid	Process
1748	regasm.exe

Suspicious use of WriteProcessMemory 24 IoCs

Processes:

Halkbank,doc.exeregasm.exe

description	pid	Process	procid_target
PID 4356 wrote to memory of 1748	4356	Halkbank,doc.exe	88
PID 4356 wrote to memory of 1748	4356	Halkbank,doc.exe	88
PID 4356 wrote to memory of 1748	4356	Halkbank,doc.exe	88
PID 4356 wrote to memory of 1748	4356	Halkbank,doc.exe	88
PID 4356 wrote to memory of 1748	4356	Halkbank,doc.exe	88
PID 4356 wrote to memory of 1748	4356	Halkbank,doc.exe	88
PID 4356 wrote to memory of 1748	4356	Halkbank,doc.exe	88
PID 4356 wrote to memory of 1748	4356	Halkbank,doc.exe	88
PID 1748 wrote to memory of 4120	1748	regasm.exe	89
PID 1748 wrote to memory of 4120	1748	regasm.exe	89
PID 1748 wrote to memory of 4120	1748	regasm.exe	89
PID 1748 wrote to memory of 4120	1748	regasm.exe	89
PID 1748 wrote to memory of 4120	1748	regasm.exe	89
PID 1748 wrote to memory of 4120	1748	regasm.exe	89
PID 1748 wrote to memory of 4120	1748	regasm.exe	89
PID 1748 wrote to memory of 4120	1748	regasm.exe	89
PID 1748 wrote to memory of 1916	1748	regasm.exe	95
PID 1748 wrote to memory of 1916	1748	regasm.exe	95
PID 1748 wrote to memory of 1916	1748	regasm.exe	95
PID 1748 wrote to memory of 1916	1748	regasm.exe	95
PID 1748 wrote to memory of 1916	1748	regasm.exe	95
PID 1748 wrote to memory of 1916	1748	regasm.exe	95
PID 1748 wrote to memory of 1916	1748	regasm.exe	95
PID 1748 wrote to memory of 1916	1748	regasm.exe	95

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:4356
- 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:1748
- - C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\xjckhms06J.ini"
    3⤵
    PID:4120
- - C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\sybtkMbfIL.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:1916

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\xjckhms06J.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1748-27-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1748-26-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1748-3-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1748-7-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1916-24-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1916-25-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1916-23-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1916-21-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1916-19-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4120-14-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4120-16-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4120-15-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4120-12-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4120-10-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4356-0-0x0000000075310000-0x00000000758C1000-memory.dmp

Filesize
5.7MB

Download
memory/4356-5-0x0000000075310000-0x00000000758C1000-memory.dmp

Filesize
5.7MB

Download
memory/4356-2-0x0000000001350000-0x0000000001360000-memory.dmp

Filesize
64KB

Download
memory/4356-1-0x0000000075310000-0x00000000758C1000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads