isrstealer | 2c26f1d6d69ba05205ddd03ab98162995885cdec77ddb68762f8e1898f405ee8

Analysis

max time kernel
143s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20230915-en
resource tags

arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
submitted
14-10-2023 17:53

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General

Target

NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
Size

320KB
MD5

491d858a95b0dc7ff89f628df79b6cd0
SHA1

506dcbfcdf033b612c00f16cdd8169d834209245
SHA256

2c26f1d6d69ba05205ddd03ab98162995885cdec77ddb68762f8e1898f405ee8
SHA512

dc9641334d4f80f956070f5a4ee05d0235dcf22d6ab8325b60b0b01c6b21cf44ca408f85ea6b7737f63051a9f40ba7f0e39fdcf30360eff040ff2c09405ff53a
SSDEEP

6144:M9pIkYUUY44xTpp9AHKVKUkAGijl7xriJOwAydhnxt:qaNUUn4xTv9dVJNriJXbt

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/4984-1-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3932-6-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3932-23-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3932-37-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/1168-33-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/1168-35-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/1168-33-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/1168-35-0x0000000000400000-0x000000000041F000-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

resource	yara_rule
behavioral2/memory/2492-2-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2140-12-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2140-14-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2140-13-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2140-16-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4904-22-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1168-32-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1168-34-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1168-33-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/1168-35-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Accesses Microsoft Outlook accounts 1 TTPs 2 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1141987721-3945596982-3297311814-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	iexplore.exe
Key opened	\REGISTRY\USER\S-1-5-21-1141987721-3945596982-3297311814-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe

Suspicious use of SetThreadContext 6 IoCs

description	pid	Process	procid_target
PID 4996 set thread context of 4984	4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	82
PID 4984 set thread context of 2492	4984	iexplore.exe	83
PID 4996 set thread context of 3932	4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	86
PID 3932 set thread context of 2140	3932	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	87
PID 4984 set thread context of 4904	4984	iexplore.exe	88
PID 3932 set thread context of 1168	3932	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	94

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
4984	iexplore.exe
3932	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe

Suspicious use of WriteProcessMemory 48 IoCs

description	pid	Process	procid_target
PID 4996 wrote to memory of 4984	4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	82
PID 4996 wrote to memory of 4984	4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	82
PID 4996 wrote to memory of 4984	4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	82
PID 4996 wrote to memory of 4984	4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	82
PID 4996 wrote to memory of 4984	4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	82
PID 4996 wrote to memory of 4984	4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	82
PID 4996 wrote to memory of 4984	4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	82
PID 4996 wrote to memory of 4984	4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	82
PID 4984 wrote to memory of 2492	4984	iexplore.exe	83
PID 4984 wrote to memory of 2492	4984	iexplore.exe	83
PID 4984 wrote to memory of 2492	4984	iexplore.exe	83
PID 4984 wrote to memory of 2492	4984	iexplore.exe	83
PID 4984 wrote to memory of 2492	4984	iexplore.exe	83
PID 4984 wrote to memory of 2492	4984	iexplore.exe	83
PID 4984 wrote to memory of 2492	4984	iexplore.exe	83
PID 4984 wrote to memory of 2492	4984	iexplore.exe	83
PID 4996 wrote to memory of 3932	4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	86
PID 4996 wrote to memory of 3932	4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	86
PID 4996 wrote to memory of 3932	4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	86
PID 4996 wrote to memory of 3932	4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	86
PID 4996 wrote to memory of 3932	4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	86
PID 4996 wrote to memory of 3932	4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	86
PID 4996 wrote to memory of 3932	4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	86
PID 4996 wrote to memory of 3932	4996	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	86
PID 3932 wrote to memory of 2140	3932	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	87
PID 3932 wrote to memory of 2140	3932	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	87
PID 3932 wrote to memory of 2140	3932	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	87
PID 3932 wrote to memory of 2140	3932	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	87
PID 3932 wrote to memory of 2140	3932	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	87
PID 3932 wrote to memory of 2140	3932	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	87
PID 3932 wrote to memory of 2140	3932	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	87
PID 3932 wrote to memory of 2140	3932	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	87
PID 4984 wrote to memory of 4904	4984	iexplore.exe	88
PID 4984 wrote to memory of 4904	4984	iexplore.exe	88
PID 4984 wrote to memory of 4904	4984	iexplore.exe	88
PID 4984 wrote to memory of 4904	4984	iexplore.exe	88
PID 4984 wrote to memory of 4904	4984	iexplore.exe	88
PID 4984 wrote to memory of 4904	4984	iexplore.exe	88
PID 4984 wrote to memory of 4904	4984	iexplore.exe	88
PID 4984 wrote to memory of 4904	4984	iexplore.exe	88
PID 3932 wrote to memory of 1168	3932	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	94
PID 3932 wrote to memory of 1168	3932	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	94
PID 3932 wrote to memory of 1168	3932	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	94
PID 3932 wrote to memory of 1168	3932	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	94
PID 3932 wrote to memory of 1168	3932	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	94
PID 3932 wrote to memory of 1168	3932	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	94
PID 3932 wrote to memory of 1168	3932	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	94
PID 3932 wrote to memory of 1168	3932	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	94

C:\Users\Admin\AppData\Local\Temp\NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
"C:\Users\Admin\AppData\Local\Temp\NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4996
- C:\Program Files (x86)\Internet Explorer\iexplore.exe
  "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4984
- - C:\Program Files (x86)\Internet Explorer\iexplore.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\OTMgUhK3mo.ini"
    3⤵
    PID:2492
- - C:\Program Files (x86)\Internet Explorer\iexplore.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\91q0n8eMYS.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:4904
- C:\Users\Admin\AppData\Local\Temp\NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
  C:\Users\Admin\AppData\Local\Temp\NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3932
- - C:\Users\Admin\AppData\Local\Temp\NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\7Jg6vAYYmK.ini"
    3⤵
    PID:2140
- - C:\Users\Admin\AppData\Local\Temp\NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\ndLQlWbB5u.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:1168

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

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\LocalLow\Microsoft\CryptnetUrlCache\Content\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D

Filesize
2KB

MD5
1ee94947dd50a0bc374767ba5f608b91

SHA1
e3635de5f588a26caeb9fd21365948e5d8ab2283

SHA256
8b462f58e5c54c5d4fe452bc9b745a91ecadbcc4835a3605b83b0f058205175e

SHA512
3d5c5a7a536f4b76c8ef2dbc2eb3f4c69ad216ff971fae49a5a89639d3396989b9cf51911f454077a1d1e1dde7aa1ed486080584a37888fba17ab54d423ae165

Download Submit
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D

Filesize
488B

MD5
dbb9e74f6ac5d858bad4f8b62df592cd

SHA1
c5224f0cf262955006318381435c4fd4bfd9c9a3

SHA256
52d029046c729f19b26699f2f16a7708daee923f0c350a5c01525251bc958edb

SHA512
575dbf6f6cdcd1a92756212a9f59976804c2c7bcdae6b46558ff695d707a0c4e3128302461f79fa3c31541bafa8ded1cb25f48b2a9253619de42e8ee47c45ce6

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\INetCache\IE\FXXN8G02\index[1].htm

Filesize
162B

MD5
4f8e702cc244ec5d4de32740c0ecbd97

SHA1
3adb1f02d5b6054de0046e367c1d687b6cdf7aff

SHA256
9e17cb15dd75bbbd5dbb984eda674863c3b10ab72613cf8a39a00c3e11a8492a

SHA512
21047fea5269fee75a2a187aa09316519e35068cb2f2f76cfaf371e5224445e9d5c98497bd76fb9608d2b73e9dac1a3f5bfadfdc4623c479d53ecf93d81d3c9f

Download Submit
C:\Users\Admin\AppData\Local\Temp\7Jg6vAYYmK.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
C:\Users\Admin\AppData\Local\Temp\OTMgUhK3mo.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1168-35-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1168-33-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1168-34-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1168-32-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

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

Filesize
332KB

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

Filesize
332KB

Download
memory/2140-13-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

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

Filesize
332KB

Download
memory/2492-2-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3932-23-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3932-6-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3932-37-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4904-22-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4984-1-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4996-0-0x0000000002350000-0x0000000002354000-memory.dmp

Filesize
16KB

Download