isrstealer | 378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef

Analysis

max time kernel
144s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
24/11/2022, 04:32

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General

Target

378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe
Size

357KB
MD5

77f0f5817a7664514c609e0a892e3183
SHA1

377ddd9ce3fac1e075352c7a7ff49189c34fdb4e
SHA256

378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef
SHA512

fdf2d80d9d4b1507dda4d5e6fe2cbb810879e8f848b4d7be5d5a2ba1bcf0044c2f3e35a484bd70c76709d5aab81a18491c6fdd365fd02e316c1f8b1b994bffcf
SSDEEP

6144:sqW+i3FV8tqehoyDZD12PRX9KHjvDbrx6TgIEy0Vi3a/D7GXj2C2SY+XTVyHh2:sD+i3DTKoy725M7dMgIq3Sl2SY+XMB

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 6 IoCs

resource	yara_rule
behavioral2/memory/1592-136-0x0000000000000000-mapping.dmp	family_isrstealer
behavioral2/memory/1592-137-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1592-139-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1592-146-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1592-156-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1592-157-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/4940-154-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/4940-155-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/4940-154-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/4940-155-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 8 IoCs

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

upx

resource	yara_rule
behavioral2/memory/332-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/332-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/332-147-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/332-148-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4940-151-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4940-153-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4940-154-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4940-155-0x0000000000400000-0x000000000041F000-memory.dmp	upx

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-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe

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
T1081

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 4300 set thread context of 1592	4300	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	82
PID 1592 set thread context of 332	1592	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	83
PID 1592 set thread context of 4940	1592	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	85

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

System Information Discovery
T1082
Runs net.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4300	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe
1592	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 4300 wrote to memory of 5040	4300	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	79
PID 4300 wrote to memory of 5040	4300	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	79
PID 4300 wrote to memory of 5040	4300	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	79
PID 5040 wrote to memory of 2060	5040	net.exe	81
PID 5040 wrote to memory of 2060	5040	net.exe	81
PID 5040 wrote to memory of 2060	5040	net.exe	81
PID 4300 wrote to memory of 1592	4300	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	82
PID 4300 wrote to memory of 1592	4300	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	82
PID 4300 wrote to memory of 1592	4300	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	82
PID 4300 wrote to memory of 1592	4300	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	82
PID 4300 wrote to memory of 1592	4300	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	82
PID 4300 wrote to memory of 1592	4300	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	82
PID 4300 wrote to memory of 1592	4300	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	82
PID 4300 wrote to memory of 1592	4300	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	82
PID 1592 wrote to memory of 332	1592	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	83
PID 1592 wrote to memory of 332	1592	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	83
PID 1592 wrote to memory of 332	1592	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	83
PID 1592 wrote to memory of 332	1592	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	83
PID 1592 wrote to memory of 332	1592	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	83
PID 1592 wrote to memory of 332	1592	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	83
PID 1592 wrote to memory of 332	1592	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	83
PID 1592 wrote to memory of 332	1592	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	83
PID 1592 wrote to memory of 4940	1592	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	85
PID 1592 wrote to memory of 4940	1592	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	85
PID 1592 wrote to memory of 4940	1592	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	85
PID 1592 wrote to memory of 4940	1592	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	85
PID 1592 wrote to memory of 4940	1592	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	85
PID 1592 wrote to memory of 4940	1592	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	85
PID 1592 wrote to memory of 4940	1592	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	85
PID 1592 wrote to memory of 4940	1592	378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe	85

C:\Users\Admin\AppData\Local\Temp\378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe
"C:\Users\Admin\AppData\Local\Temp\378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4300
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop sharedaccess
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:5040
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop sharedaccess
    3⤵
    PID:2060
- C:\Users\Admin\AppData\Local\Temp\378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe
  "C:\Users\Admin\AppData\Local\Temp\378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1592
- - C:\Users\Admin\AppData\Local\Temp\378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\eppeKo2oor.ini"
    3⤵
    PID:332
- - C:\Users\Admin\AppData\Local\Temp\378894a8b085cb5091a4028cb80cab7a9c939e2efc208c38c13106ca49847bef.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\zgJ8jDclVI.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:4940

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\eppeKo2oor.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/332-143-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/332-148-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/332-147-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/332-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1592-146-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1592-139-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1592-137-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1592-156-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1592-157-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4940-151-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4940-153-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4940-154-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4940-155-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download