isrstealer | a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a

General

Target

a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe
Size

1.1MB
MD5

018241640ae3cf3433590e6edd6816c7
SHA1

f8c70938a4bcb28530161d53f3e9732f1f14d2d2
SHA256

a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a
SHA512

9d8541e33446c2e12a177d46cacf262c749225df31ca65360605826094eafa3b8c2eee583b511b432e90799c722626d27f1cb71108000cbfdbb8c300e9bc9bf8
SSDEEP

24576:8RmJkqoQrilOIQ+yMxGaCAK0SQOb/yIwhCtS:tJXoQryTiMxGaCLOOb/yhQS

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/3524-133-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3524-143-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3524-145-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3524-153-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/1500-150-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/1500-151-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/1500-152-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 3 IoCs

resource	yara_rule
behavioral2/memory/1500-150-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/1500-151-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/1500-152-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4328-138-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4328-140-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4328-141-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4328-142-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1500-147-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1500-149-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1500-150-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1500-151-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1500-152-0x0000000000400000-0x000000000041F000-memory.dmp	upx

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-1-5-21-2386679933-1492765628-3466841596-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1080 set thread context of 3524	1080	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	83
PID 3524 set thread context of 4328	3524	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	84
PID 3524 set thread context of 1500	3524	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	85

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

System Information Discovery
T1082

Suspicious use of FindShellTrayWindow 3 IoCs

pid	Process
1080	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe
1080	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe
1080	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe

Suspicious use of SendNotifyMessage 3 IoCs

pid	Process
1080	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe
1080	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe
1080	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3524	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1080 wrote to memory of 3524	1080	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	83
PID 1080 wrote to memory of 3524	1080	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	83
PID 1080 wrote to memory of 3524	1080	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	83
PID 1080 wrote to memory of 3524	1080	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	83
PID 1080 wrote to memory of 3524	1080	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	83
PID 1080 wrote to memory of 3524	1080	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	83
PID 1080 wrote to memory of 3524	1080	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	83
PID 3524 wrote to memory of 4328	3524	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	84
PID 3524 wrote to memory of 4328	3524	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	84
PID 3524 wrote to memory of 4328	3524	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	84
PID 3524 wrote to memory of 4328	3524	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	84
PID 3524 wrote to memory of 4328	3524	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	84
PID 3524 wrote to memory of 4328	3524	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	84
PID 3524 wrote to memory of 4328	3524	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	84
PID 3524 wrote to memory of 4328	3524	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	84
PID 3524 wrote to memory of 1500	3524	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	85
PID 3524 wrote to memory of 1500	3524	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	85
PID 3524 wrote to memory of 1500	3524	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	85
PID 3524 wrote to memory of 1500	3524	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	85
PID 3524 wrote to memory of 1500	3524	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	85
PID 3524 wrote to memory of 1500	3524	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	85
PID 3524 wrote to memory of 1500	3524	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	85
PID 3524 wrote to memory of 1500	3524	a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe	85

C:\Users\Admin\AppData\Local\Temp\a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe
"C:\Users\Admin\AppData\Local\Temp\a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1080
- C:\Users\Admin\AppData\Local\Temp\a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe
  "C:\Users\Admin\AppData\Local\Temp\a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3524
- - C:\Users\Admin\AppData\Local\Temp\a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\NySdzA2eq4.ini"
    3⤵
    PID:4328
- - C:\Users\Admin\AppData\Local\Temp\a3b3db39a3f9f5b28ed6e27f18c0ae7c1dafb1353d3698279bc3e46c8bc1124a.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\qcxqg9WyBF.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:1500

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\NySdzA2eq4.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1500-149-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1500-152-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1500-151-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1500-150-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1500-147-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3524-145-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3524-143-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3524-133-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3524-153-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4328-141-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4328-142-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4328-140-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4328-138-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download

Analysis

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