isrstealer | 161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6

General

Target

161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe
Size

404KB
MD5

4e41e8f87c89c2f7dd423a0750871b81
SHA1

fc85caa8b48841fbd8064fc7bbe3a1d13b2c8992
SHA256

161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6
SHA512

1eaf21197de113e55c2bdf2db6522245a2381d0696f9caa4f6c26e9443cdfe38f78c4d8a04e0b0baae58c1ee7a406fdf1336bfad4a921e1d6da2c09913f790ed
SSDEEP

12288:/B/USBseMoZWv6TuKHM+mm7Q2aQfRE6QMm:/BUJepkyTrHM+mEjaQftQ3

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 5 IoCs

resource	yara_rule
behavioral2/memory/1552-135-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1552-137-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1552-143-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1552-149-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1552-156-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/1404-150-0x0000000000000000-mapping.dmp	MailPassView
behavioral2/memory/1404-154-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/1404-155-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 3 IoCs

resource	yara_rule
behavioral2/memory/1404-150-0x0000000000000000-mapping.dmp	Nirsoft
behavioral2/memory/1404-154-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/1404-155-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 8 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4148-142-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4148-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4148-146-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4148-147-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1404-151-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1404-153-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1404-154-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1404-155-0x0000000000400000-0x000000000041F000-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-1-5-21-4060001867-1434967833-2212371794-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 4332 set thread context of 1552	4332	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	87
PID 1552 set thread context of 4148	1552	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	89
PID 1552 set thread context of 1404	1552	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	93

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1552	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 4332 wrote to memory of 1552	4332	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	87
PID 4332 wrote to memory of 1552	4332	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	87
PID 4332 wrote to memory of 1552	4332	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	87
PID 4332 wrote to memory of 1552	4332	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	87
PID 4332 wrote to memory of 1552	4332	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	87
PID 4332 wrote to memory of 1552	4332	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	87
PID 4332 wrote to memory of 1552	4332	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	87
PID 1552 wrote to memory of 4148	1552	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	89
PID 1552 wrote to memory of 4148	1552	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	89
PID 1552 wrote to memory of 4148	1552	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	89
PID 1552 wrote to memory of 4148	1552	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	89
PID 1552 wrote to memory of 4148	1552	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	89
PID 1552 wrote to memory of 4148	1552	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	89
PID 1552 wrote to memory of 4148	1552	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	89
PID 1552 wrote to memory of 4148	1552	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	89
PID 1552 wrote to memory of 1404	1552	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	93
PID 1552 wrote to memory of 1404	1552	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	93
PID 1552 wrote to memory of 1404	1552	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	93
PID 1552 wrote to memory of 1404	1552	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	93
PID 1552 wrote to memory of 1404	1552	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	93
PID 1552 wrote to memory of 1404	1552	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	93
PID 1552 wrote to memory of 1404	1552	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	93
PID 1552 wrote to memory of 1404	1552	161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe	93

C:\Users\Admin\AppData\Local\Temp\161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe
"C:\Users\Admin\AppData\Local\Temp\161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4332
- C:\Users\Admin\AppData\Local\Temp\161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe
  "C:\Users\Admin\AppData\Local\Temp\161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1552
- - C:\Users\Admin\AppData\Local\Temp\161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\2wa52k4AUd.ini"
    3⤵
    PID:4148
- - C:\Users\Admin\AppData\Local\Temp\161d4de39ca95ff50682c36624d03beca497957619f7b69b5ecae8b045cf22f6.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\8f6a0Y5vMe.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:1404

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

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\2wa52k4AUd.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1404-155-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1404-154-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1404-153-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1404-151-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1552-156-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1552-135-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1552-137-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1552-143-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1552-149-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4148-147-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4148-146-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4148-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4148-142-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4332-140-0x00000000748D0000-0x0000000074E81000-memory.dmp

Filesize
5.7MB

Download
memory/4332-132-0x00000000748D0000-0x0000000074E81000-memory.dmp

Filesize
5.7MB

Download
memory/4332-133-0x00000000748D0000-0x0000000074E81000-memory.dmp

Filesize
5.7MB

Download

Analysis

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