isrstealer | 097ec0959c3f572c2f3de06647d53b1cc4e7d05c2c947f3e29e85602ee7beaf8

Analysis

max time kernel
118s
max time network
142s
platform
windows7_x64
resource
win7-20220414-en
submitted
21-05-2022 03:32

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General

Target

PO.img.jpg.exe
Size

371KB
MD5

05643226c4f1d9116d9cd0bc31f2eea9
SHA1

80e883195c0108a28d79fd638b326ccd4affad19
SHA256

141d8dd9c235560984db345a6414c17c5fed18e5b2106f240a58f3cdcc9f9584
SHA512

8c7d54423af88f7c6a0ced3e5f768a1f72df90b9478fbd4c7903271b1b8adefbc44228e11dcf71ba6e8d07f08d87b3271b6a0e79801ccb0034f47090638757fe

Score

10^/10

isrstealer collection 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/1964-61-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1964-63-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1964-64-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/1964-75-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/1552-84-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/1552-85-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral1/memory/1552-84-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/1552-85-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 8 IoCs

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

upx

resource	yara_rule
behavioral1/memory/784-69-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/784-73-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/784-74-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/784-76-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1552-79-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1552-83-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1552-84-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1552-85-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2277218442-1199762539-2004043321-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	RegSvcs.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 904 set thread context of 1964	904	PO.img.jpg.exe	30
PID 1964 set thread context of 784	1964	RegSvcs.exe	31
PID 1964 set thread context of 1552	1964	RegSvcs.exe	34

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
1984	schtasks.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1964	RegSvcs.exe

Suspicious use of WriteProcessMemory 39 IoCs

description	pid	Process	procid_target
PID 904 wrote to memory of 1984	904	PO.img.jpg.exe	28
PID 904 wrote to memory of 1984	904	PO.img.jpg.exe	28
PID 904 wrote to memory of 1984	904	PO.img.jpg.exe	28
PID 904 wrote to memory of 1984	904	PO.img.jpg.exe	28
PID 904 wrote to memory of 1964	904	PO.img.jpg.exe	30
PID 904 wrote to memory of 1964	904	PO.img.jpg.exe	30
PID 904 wrote to memory of 1964	904	PO.img.jpg.exe	30
PID 904 wrote to memory of 1964	904	PO.img.jpg.exe	30
PID 904 wrote to memory of 1964	904	PO.img.jpg.exe	30
PID 904 wrote to memory of 1964	904	PO.img.jpg.exe	30
PID 904 wrote to memory of 1964	904	PO.img.jpg.exe	30
PID 904 wrote to memory of 1964	904	PO.img.jpg.exe	30
PID 904 wrote to memory of 1964	904	PO.img.jpg.exe	30
PID 904 wrote to memory of 1964	904	PO.img.jpg.exe	30
PID 904 wrote to memory of 1964	904	PO.img.jpg.exe	30
PID 1964 wrote to memory of 784	1964	RegSvcs.exe	31
PID 1964 wrote to memory of 784	1964	RegSvcs.exe	31
PID 1964 wrote to memory of 784	1964	RegSvcs.exe	31
PID 1964 wrote to memory of 784	1964	RegSvcs.exe	31
PID 1964 wrote to memory of 784	1964	RegSvcs.exe	31
PID 1964 wrote to memory of 784	1964	RegSvcs.exe	31
PID 1964 wrote to memory of 784	1964	RegSvcs.exe	31
PID 1964 wrote to memory of 784	1964	RegSvcs.exe	31
PID 1964 wrote to memory of 784	1964	RegSvcs.exe	31
PID 1964 wrote to memory of 784	1964	RegSvcs.exe	31
PID 1964 wrote to memory of 784	1964	RegSvcs.exe	31
PID 1964 wrote to memory of 784	1964	RegSvcs.exe	31
PID 1964 wrote to memory of 1552	1964	RegSvcs.exe	34
PID 1964 wrote to memory of 1552	1964	RegSvcs.exe	34
PID 1964 wrote to memory of 1552	1964	RegSvcs.exe	34
PID 1964 wrote to memory of 1552	1964	RegSvcs.exe	34
PID 1964 wrote to memory of 1552	1964	RegSvcs.exe	34
PID 1964 wrote to memory of 1552	1964	RegSvcs.exe	34
PID 1964 wrote to memory of 1552	1964	RegSvcs.exe	34
PID 1964 wrote to memory of 1552	1964	RegSvcs.exe	34
PID 1964 wrote to memory of 1552	1964	RegSvcs.exe	34
PID 1964 wrote to memory of 1552	1964	RegSvcs.exe	34
PID 1964 wrote to memory of 1552	1964	RegSvcs.exe	34
PID 1964 wrote to memory of 1552	1964	RegSvcs.exe	34

C:\Users\Admin\AppData\Local\Temp\PO.img.jpg.exe
"C:\Users\Admin\AppData\Local\Temp\PO.img.jpg.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:904
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\jrtQOooYewvWK" /XML "C:\Users\Admin\AppData\Local\Temp\tmp7437.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:1984
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
  "{path}"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1964
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\hCD0mz0PWD.ini"
    3⤵
    PID:784
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\ts5pbjex6t.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:1552

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Email Collection

T1114

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\hCD0mz0PWD.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp7437.tmp

Filesize
1KB

MD5
793f39ff0c719c9128056b673f98bc95

SHA1
ac6b69c541314377ac0d785241b81441d0436818

SHA256
1b5925eba154bd5f8a1e775eb84bc7225ee8d1ec86f5b4ecf4b1c2396e429f29

SHA512
79025e373eaaa35e6240dc17deeee847c89177b569b07fc7909daa56e0294511daa8ad4238ce6249ce94fa943d7b8de732ab6eb4ec10727ffb900bb99e7d7408

Download Submit
memory/784-69-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/784-76-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/784-74-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/784-73-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/904-55-0x0000000074AE0000-0x000000007508B000-memory.dmp

Filesize
5.7MB

Download
memory/904-54-0x00000000761F1000-0x00000000761F3000-memory.dmp

Filesize
8KB

Download
memory/1552-79-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1552-85-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1552-84-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1552-83-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1964-61-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1964-58-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1964-75-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1964-59-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1964-63-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download

Analysis

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General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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