isrstealer | 78dda119ddc3b77095009f357809e3451bb897e51053601b1088ae5c61949097

General

Target

Halkbank,pdf.exe
Size

774KB
MD5

9b2179379bb6e1db0736ff6f0d1802d7
SHA1

05224683315e5bd369459a0261627f04e2e49c31
SHA256

78dda119ddc3b77095009f357809e3451bb897e51053601b1088ae5c61949097
SHA512

430ad61a637fb5d315a94d753f73aabe3d25fa1cc25673fde71e88b730527c089c46b117d6dfaed84b760b0c6a6aa9729f17ec3b56e74338be0898a848388d09
SSDEEP

12288:NGDOji83jDZJ0CbJOOBgVIjPLPEZkckxpG1QcA3HxiffSogx8E9k8BJQ:wCF3j9GeJOVVIjTxlL3AffSoU8+k8o

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
behavioral1/memory/3056-6-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/3056-21-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/3056-28-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/3056-29-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

Processes:

resource	yara_rule
behavioral1/memory/2732-25-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/2732-27-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2732-25-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/2732-27-0x0000000000400000-0x000000000041F000-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
behavioral1/memory/2140-12-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2140-14-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2140-16-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2140-15-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2140-18-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2732-20-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2732-23-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2732-24-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2732-25-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2732-27-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

Processes:

Halkbank,pdf.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-2180306848-1874213455-4093218721-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	Halkbank,pdf.exe

Suspicious use of SetThreadContext 3 IoCs

Processes:

Halkbank,pdf.exeHalkbank,pdf.exe

description	pid	process	target process
PID 2928 set thread context of 3056	2928	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 3056 set thread context of 2140	3056	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 3056 set thread context of 2732	3056	Halkbank,pdf.exe	Halkbank,pdf.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

Halkbank,pdf.exe

pid process

2928 Halkbank,pdf.exe
Suspicious behavior: MapViewOfSection 2 IoCs

Processes:

Halkbank,pdf.exe

pid process

2928 Halkbank,pdf.exe
2928 Halkbank,pdf.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Halkbank,pdf.exe

pid process

3056 Halkbank,pdf.exe

pid	process
2928	Halkbank,pdf.exe

pid	process
2928	Halkbank,pdf.exe
2928	Halkbank,pdf.exe

pid	process
3056	Halkbank,pdf.exe

Suspicious use of WriteProcessMemory 22 IoCs

Processes:

Halkbank,pdf.exeHalkbank,pdf.exe

description	pid	process	target process
PID 2928 wrote to memory of 3056	2928	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 2928 wrote to memory of 3056	2928	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 2928 wrote to memory of 3056	2928	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 2928 wrote to memory of 3056	2928	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 3056 wrote to memory of 2140	3056	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 3056 wrote to memory of 2140	3056	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 3056 wrote to memory of 2140	3056	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 3056 wrote to memory of 2140	3056	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 3056 wrote to memory of 2140	3056	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 3056 wrote to memory of 2140	3056	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 3056 wrote to memory of 2140	3056	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 3056 wrote to memory of 2140	3056	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 3056 wrote to memory of 2140	3056	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 3056 wrote to memory of 2732	3056	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 3056 wrote to memory of 2732	3056	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 3056 wrote to memory of 2732	3056	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 3056 wrote to memory of 2732	3056	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 3056 wrote to memory of 2732	3056	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 3056 wrote to memory of 2732	3056	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 3056 wrote to memory of 2732	3056	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 3056 wrote to memory of 2732	3056	Halkbank,pdf.exe	Halkbank,pdf.exe
PID 3056 wrote to memory of 2732	3056	Halkbank,pdf.exe	Halkbank,pdf.exe

C:\Users\Admin\AppData\Local\Temp\Halkbank,pdf.exe
"C:\Users\Admin\AppData\Local\Temp\Halkbank,pdf.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2928
- C:\Users\Admin\AppData\Local\Temp\Halkbank,pdf.exe
  "C:\Users\Admin\AppData\Local\Temp\Halkbank,pdf.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3056
- - C:\Users\Admin\AppData\Local\Temp\Halkbank,pdf.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\d6IMsBzpBU.ini"
    3⤵
    PID:2140
- - C:\Users\Admin\AppData\Local\Temp\Halkbank,pdf.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\gjonPKvzRc.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:2732

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\d6IMsBzpBU.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/2140-15-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2140-18-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2140-12-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2140-14-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2140-16-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2732-27-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2732-25-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2732-24-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2732-23-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2732-20-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2928-5-0x0000000000260000-0x0000000000261000-memory.dmp

Filesize
4KB

Download
memory/2928-8-0x0000000000400000-0x00000000004C7000-memory.dmp

Filesize
796KB

Download
memory/2928-0-0x0000000000230000-0x0000000000231000-memory.dmp

Filesize
4KB

Download
memory/2928-4-0x0000000000400000-0x00000000004C7000-memory.dmp

Filesize
796KB

Download
memory/2928-3-0x0000000000400000-0x00000000004C7000-memory.dmp

Filesize
796KB

Download
memory/2928-2-0x0000000000230000-0x0000000000231000-memory.dmp

Filesize
4KB

Download
memory/2928-1-0x0000000000400000-0x00000000004C7000-memory.dmp

Filesize
796KB

Download
memory/3056-6-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3056-21-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3056-28-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3056-29-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads