isrstealer | 2c26f1d6d69ba05205ddd03ab98162995885cdec77ddb68762f8e1898f405ee8

Analysis

max time kernel
120s
max time network
133s
platform
windows7_x64
resource
win7-20230831-en
resource tags

arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-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
behavioral1/memory/1924-10-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1924-6-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1924-24-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1924-84-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/2744-83-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/2744-86-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral1/memory/2744-83-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/2744-86-0x0000000000400000-0x000000000041F000-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 8 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2624-15-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2624-17-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2624-19-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2624-21-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2744-79-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2744-81-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2744-83-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2744-86-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3185155662-718608226-894467740-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 2128 set thread context of 2264	2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	28
PID 2128 set thread context of 1924	2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	29
PID 1924 set thread context of 2624	1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	30
PID 1924 set thread context of 2744	1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	35

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe

Suspicious use of WriteProcessMemory 31 IoCs

description	pid	Process	procid_target
PID 2128 wrote to memory of 2264	2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	28
PID 2128 wrote to memory of 2264	2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	28
PID 2128 wrote to memory of 2264	2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	28
PID 2128 wrote to memory of 2264	2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	28
PID 2128 wrote to memory of 2264	2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	28
PID 2128 wrote to memory of 1924	2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	29
PID 2128 wrote to memory of 1924	2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	29
PID 2128 wrote to memory of 1924	2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	29
PID 2128 wrote to memory of 1924	2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	29
PID 2128 wrote to memory of 1924	2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	29
PID 2128 wrote to memory of 1924	2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	29
PID 2128 wrote to memory of 1924	2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	29
PID 2128 wrote to memory of 1924	2128	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	29
PID 1924 wrote to memory of 2624	1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	30
PID 1924 wrote to memory of 2624	1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	30
PID 1924 wrote to memory of 2624	1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	30
PID 1924 wrote to memory of 2624	1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	30
PID 1924 wrote to memory of 2624	1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	30
PID 1924 wrote to memory of 2624	1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	30
PID 1924 wrote to memory of 2624	1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	30
PID 1924 wrote to memory of 2624	1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	30
PID 1924 wrote to memory of 2624	1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	30
PID 1924 wrote to memory of 2744	1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	35
PID 1924 wrote to memory of 2744	1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	35
PID 1924 wrote to memory of 2744	1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	35
PID 1924 wrote to memory of 2744	1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	35
PID 1924 wrote to memory of 2744	1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	35
PID 1924 wrote to memory of 2744	1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	35
PID 1924 wrote to memory of 2744	1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	35
PID 1924 wrote to memory of 2744	1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	35
PID 1924 wrote to memory of 2744	1924	NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe	35

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:2128
- C:\Program Files (x86)\Internet Explorer\iexplore.exe
  "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
  2⤵
  PID:2264
- 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:1924
- - C:\Users\Admin\AppData\Local\Temp\NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\oWE1cs5zMt.ini"
    3⤵
    PID:2624
- - C:\Users\Admin\AppData\Local\Temp\NEAS.491d858a95b0dc7ff89f628df79b6cd0.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\AIyjJPJ0rt.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:2744

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\Local\Temp\CabE514.tmp

Filesize
61KB

MD5
f3441b8572aae8801c04f3060b550443

SHA1
4ef0a35436125d6821831ef36c28ffaf196cda15

SHA256
6720349e7d82ee0a8e73920d3c2b7cb2912d9fcf2edb6fd98f2f12820158b0bf

SHA512
5ba01ba421b50030e380ae6bbcd2f681f2a91947fe7fedb3c8e6b5f24dce9517abf57b1cf26cc6078d4bb53bde6fcfb2561591337c841f8f2cb121a3d71661b9

Download Submit
C:\Users\Admin\AppData\Local\Temp\TarE565.tmp

Filesize
163KB

MD5
9441737383d21192400eca82fda910ec

SHA1
725e0d606a4fc9ba44aa8ffde65bed15e65367e4

SHA256
bc3a6e84e41faeb57e7c21aa3b60c2a64777107009727c5b7c0ed8fe658909e5

SHA512
7608dd653a66cd364392a78d4711b48d1707768d36996e4d38871c6843b5714e1d7da4b4cc6db969e6000cfa182bcb74216ef6823d1063f036fc5c3413fb8dcf

Download Submit
C:\Users\Admin\AppData\Local\Temp\oWE1cs5zMt.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1924-6-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1924-2-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1924-8-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1924-84-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1924-4-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1924-24-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1924-10-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2128-0-0x0000000000260000-0x0000000000264000-memory.dmp

Filesize
16KB

Download
memory/2624-21-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2624-19-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2624-17-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2624-15-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2744-79-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2744-81-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2744-83-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2744-86-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download